US20160113901A1 - Cyclic Peptidomimetic Compounds as Immunomodulators - Google Patents

Cyclic Peptidomimetic Compounds as Immunomodulators Download PDF

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US20160113901A1
US20160113901A1 US14/989,954 US201614989954A US2016113901A1 US 20160113901 A1 US20160113901 A1 US 20160113901A1 US 201614989954 A US201614989954 A US 201614989954A US 2016113901 A1 US2016113901 A1 US 2016113901A1
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cancer
compound
amino acid
hydrogen
formula
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Pottayil Govindan Nair Sasikumar
Muralidhara Ramachandra
Seetharamaiah Setty Sudarshan Naremaddepalli
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Aurigene Oncology Ltd
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Aurigene Discovery Technologies Ltd
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Priority claimed from US14/478,806 external-priority patent/US9233940B2/en
Application filed by Aurigene Discovery Technologies Ltd filed Critical Aurigene Discovery Technologies Ltd
Priority to US14/989,954 priority Critical patent/US20160113901A1/en
Publication of US20160113901A1 publication Critical patent/US20160113901A1/en
Priority to US15/332,805 priority patent/US10106581B2/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
    • C07K7/64—Cyclic peptides containing only normal peptide links
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/38—Heterocyclic compounds having sulfur as a ring hetero atom
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
    • A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/04—Antibacterial agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/10—Antimycotics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A61P35/02—Antineoplastic agents specific for leukemia
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A61P37/02—Immunomodulators
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C229/00—Compounds containing amino and carboxyl groups bound to the same carbon skeleton
    • C07C229/02—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton
    • C07C229/04—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being acyclic and saturated
    • C07C229/26—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being acyclic and saturated having more than one amino group bound to the carbon skeleton, e.g. lysine
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C231/00—Preparation of carboxylic acid amides
    • C07C231/02—Preparation of carboxylic acid amides from carboxylic acids or from esters, anhydrides, or halides thereof by reaction with ammonia or amines
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C243/00—Compounds containing chains of nitrogen atoms singly-bound to each other, e.g. hydrazines, triazanes
    • C07C243/24—Hydrazines having nitrogen atoms of hydrazine groups acylated by carboxylic acids
    • C07C243/26—Hydrazines having nitrogen atoms of hydrazine groups acylated by carboxylic acids with acylating carboxyl groups bound to hydrogen atoms or to acyclic carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C273/18—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of substituted ureas
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C275/00—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C275/04—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of urea groups bound to acyclic carbon atoms
    • C07C275/06—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of urea groups bound to acyclic carbon atoms of an acyclic and saturated carbon skeleton
    • C07C275/16—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of urea groups bound to acyclic carbon atoms of an acyclic and saturated carbon skeleton being further substituted by carboxyl groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D259/00—Heterocyclic compounds containing rings having more than four nitrogen atoms as the only ring hetero atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D273/00—Heterocyclic compounds containing rings having nitrogen and oxygen atoms as the only ring hetero atoms, not provided for by groups C07D261/00 - C07D271/00
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

Definitions

  • the present invention relates to cyclic peptidomimetic compounds therapeutically useful as immune modulators.
  • the invention also relates to pharmaceutical compositions comprising said cyclic peptidomimetic compounds as therapeutic agents.
  • PD-1 Programmed cell death-1
  • PD-L1 or PD-L2 are members of the CD28 superfamily that delivers negative signals upon interaction with its two ligands, PD-L1 or PD-L2.
  • PD-1 and its ligands are broadly expressed and exert a wider range of immunoregulatory roles in T cells activation and tolerance compared with other CD28 members.
  • PD-1 and its ligands are involved in attenuating infectious immunity and tumor immunity, and facilitating chronic infection and tumor progression.
  • the biological significance of PD-1 and its ligand suggests the therapeutic potential of manipulation of PD-1 pathway against various human diseases (Ariel Pedoeem et al., Curr Top Microbiol Immunol. (2011); 350:17-37).
  • T-cell activation and dysfunction relies on direct and modulated receptors. Based on their functional outcome, co-signaling molecules can be divided as co-stimulators and co-inhibitors, which positively and negatively control the priming, growth, differentiation and functional maturation of a T-cell response (Li Shi, et al., Journal of Hematology & Oncology 2013, 6:74).
  • PD-1 programmed cell death protein-1
  • Several PD-1 pathway inhibitors have shown robust activity in various phases of on-going clinical trials (RD Harvey, Clinical Pharmacology & Therapeutics (2014); 96 2, 214-223).
  • PD-1 Programmed death-1
  • PD-L1 or PD-L2 The binding of PD-1 to its ligands, PD-L1 or PD-L2, is vital for the physiological regulation of the immune system.
  • a major functional role of the PD-1 signaling pathway is the inhibition of self-reactive T cells, which serve to protect against autoimmune diseases. Elimination of the PD-1 pathway can therefore result in the breakdown of immune tolerance that can ultimately lead to the development of pathogenic autoimmunity.
  • tumor cells can at times co-opt the PD-1 pathway to escape from immunosurveillance mechanisms. Therefore, blockade of the PD-1 pathway has become an attractive target in cancer therapy.
  • the present invention provides cyclic peptidomimetic compounds which are capable of suppressing and/or inhibiting the programmed cell death 1 (PD1) signaling pathway.
  • PD1 programmed cell death 1
  • cyclic peptidomimetic compounds or a stereoisomer thereof or a pharmaceutically acceptable salt thereof or pharmaceutical compositions thereof are provided which suppress and/or inhibit the programmed cell death 1 (PD1) signalling pathway.
  • PD1 programmed cell death 1
  • the present invention provides cyclic peptidomimetic compounds of formula (I):
  • R 1 is a side chain of amino acid Ala, Ser, Thr or Leu;
  • R 2 is a side chain of amino acid Asp, Glu, Gln or Asn;
  • [Aaa] is an amino acid residue selected from Ser, Asp, Ala, Ile, Phe, Trp, Lys, Glu or Thr;
  • R 3 is hydrogen or alkyl
  • each of R 4 and R 4 ′ independently are hydrogen or alkyl
  • both R a and R a ′ are hydrogen; or together are an oxo ( ⁇ O) group;
  • both R b and R b ′ are hydrogen; or together are an oxo ( ⁇ O) group;
  • X is CH 2 , 0 or S
  • R 5 is hydrogen or alkyl
  • n is an integer from 1 to 3;
  • n is an integer from 2 to 20.
  • a pharmaceutical composition comprising a compound of formula (I) or a pharmaceutically acceptable salt or a stereoisomer and processes for preparing thereof.
  • PD1 programmed cell death 1
  • methods for suppressing and/or inhibiting the programmed cell death 1 (PD1) signaling pathway in a subject by administering cyclic peptidomimetic compounds of formula (I) or a pharmaceutically acceptable salt or a stereoisomer thereof or pharmaceutical compositions thereof.
  • FIGS. 1A-1C depict the chemical synthetic scheme for Compound 1.
  • FIGS. 2A-2B depict the chemical synthetic scheme for Compound 2.
  • FIGS. 3A-3C depict the chemical synthetic scheme for Compound 3.
  • the present invention provides cyclic peptidomimetic compounds as therapeutic agents useful for treatment of disorders via immunopotentiation comprising inhibition of immunosuppressive signal induced due to PD-1, PD-L1, or PD-L2 and therapies using them.
  • the present invention relates to compounds of formula (I)
  • R 1 is side chain of amino acid Ala, Ser, Thr or Leu;
  • R 2 is a side chain of amino acid Asp, Glu, Gln or Asn;
  • [Aaa] is an amino acid residue Ser, Asp, Ala, Ile, Phe, Trp, Lys, Glu, or Thr;
  • R 3 is hydrogen or alkyl
  • each of R 4 and R 4 ′ independently are hydrogen or alkyl
  • both R a and R a ′ are hydrogen; or together are an oxo ( ⁇ O) group;
  • both R b and R b ′ are hydrogen; or together are an oxo ( ⁇ O) group;
  • X is CH 2 , O or S
  • R 5 is hydrogen or alkyl
  • n is an integer from 1 to 3;
  • n is an integer from 2 to 20.
  • the invention comprises a particular series of compounds of formula (IA):
  • R 1 , R 2 , R 3 , R 4 , R 4 ′, R a , R a ′, R b , R b ′ and [Aaa] are same as defined in formula (I).
  • the invention comprises a particular series of compounds of formula (IB):
  • R 1 , R 2 and [Aaa] are same as defined in formula (I).
  • the invention comprises a particular series of compounds of formula (IC):
  • R 1 , R 2 and [Aaa] are same as defined in formula (I).
  • the present invention provides compounds of formula (I), wherein,
  • R 1 is a side chain of amino acid Ser or Thr
  • R 2 is a side chain of amino acid of Asp, Asn or Glu
  • [Aaa] is an amino acid residue selected from Ser or Thr;
  • R 3 , R 4 and R 4 ′ independently are hydrogen
  • both R a and R a ′ together are an oxo ( ⁇ O) group
  • both R b and R b ′ together are an oxo ( ⁇ O) group
  • L is —C(O)—(CH 2 ) m —(X—CH 2 —CH 2 ) n —NH—;
  • X is CH 2 or O
  • n is an integer from 1 to 3;
  • n is an integer from 2 to 20;
  • R 4 ′ is C 1-5 alkyl such as methyl.
  • the present invention provides a pharmaceutical composition
  • a pharmaceutical composition comprising the compound as disclosed, and a pharmaceutically acceptable carrier or diluent.
  • the pharmaceutical composition comprises at least one additional pharmaceutical agent wherein the additional pharmaceutical agent is an anticancer agent, chemotherapy agent, or antiproliferative compound.
  • the compounds as disclosed in the present invention are formulated for pharmaceutical administration.
  • the present invention provides use of the compounds as disclosed in the present invention for the preparation of a medicament for the treatment of cancer.
  • the present invention provides use of the compounds as disclosed in the present invention for the preparation of a medicament for the treatment of infectious diseases or bacterial, viral and fungal infections.
  • the present invention provides a method of treatment of cancer, wherein the method comprises administration of an effective amount of the compound of the present invention or of a pharmaceutical composition thereof to the subject in need thereof.
  • the present invention provides a method for inhibiting growth of tumour cells and/or metastasis by administering an effective amount of the compound of the present invention or of a pharmaceutical composition thereof to the subject in need thereof.
  • tumour cells include cancer such as but not limited to melanoma, renal cancer, prostate cancer, breast cancer, colon cancer and lung cancer, bone cancer, pancreatic cancer, skin cancer, cancer of the head or neck, cutaneous or intraocular malignant melanoma, uterine cancer, ovarian cancer, rectal cancer, cancer of the anal region, stomach cancer, testicular cancer, carcinoma of the fallopian tubes, carcinoma of the endometrium, carcinoma of the cervix, carcinoma of the vagina, carcinoma of the vulva, Hodgkin's Disease, non-Hodgkin's lymphoma, cancer of the esophagus, cancer of the small intestine, cancer of the endocrine system, cancer of the thyroid gland, cancer of the parathyroid gland, cancer of the adrenal gland, sarcoma of soft tissue, cancer of the urethra, cancer of the penis, chronic or acute leukemias including acute myeloid leukemia, chronic myeloid leukemia, acute lymphoblastic leukemia,
  • Still yet another embodiment of the present invention provides a method of treatment of infection via immunopotentiation caused by inhibition of immunosuppressive signal induced by PD-1, PD-L1, or PD-L2, wherein the method comprises administration of an effective amount of the compound of the present invention or of a pharmaceutical composition thereof to the subject in need thereof.
  • the infectious disease includes but not limited to HIV, Influenza, Herpes, Giardia , Malaria, Leishmania , the pathogenic infection by the virus Hepatitis (A, B, & C), herpes virus (e.g., VZV, HSV-I, HAV-6, HSV-II, and CMV, Epstein Barr virus), adenovirus, influenza virus, flaviviruses, echovirus, rhinovirus, coxsackie virus, cornovirus, respiratory syncytial virus, mumps virus, rotavirus, measles virus, rubella virus, parvovirus, vaccinia virus, HTLV virus, dengue virus, papillomavirus, molluscum virus, poliovirus, rabies virus, JC virus and arboviral encephalitis virus, pathogenic infection by the bacteria chlamydia, rickettsial bacteria, mycobacteria, staphylococci, streptococci, pneumonococci, mening
  • coli legionella , diphtheria, salmonella , bacilli, cholera, tetanus, botulism, anthrax, plague, leptospirosis, and Lyme's disease bacteria, pathogenic infection by the fungi Candida ( albicans, krusei, glabrata, tropicalis , etc.), Cryptococcus neoformans, Aspergillus ( fumigatus, niger , etc.), Genus Mucorales ( mucor, absidia, rhizophus ), Sporothrix schenkii, Blastomyces dermatitidis, Paracoccidioides brasiliensis, Coccidioides immitis and Histoplasma capsulatum , and pathogenic infection by the parasites Entamoeba histolytica, Balantidium coli, Naegleria fowleri, Acanthamoeba sp., Giardia lambia, Cryptosporidium sp
  • the compounds of the present invention may be used as single drugs or as a pharmaceutical composition in which the compound is mixed with various pharmacologically acceptable materials.
  • compositions are usually administered by oral or inhalation routes, but can be administered by parenteral administration route.
  • compositions can be administered, for example, by orally, intravenous infusion, topically, intraperitoneally, intravesically or intrathecally.
  • parenteral administration includes but not limited to intraarticular (in the joints), intravenous, intramuscular, intradermal, intraperitoneal, and subcutaneous routes, include aqueous and non-aqueous, isotonic sterile injection solutions, which can contain antioxidants, buffers, bacteriostats, and solutes that render the formulation isotonic with the blood of the intended recipient, and aqueous and non-aqueous sterile suspensions that can include suspending agents, solubilizers, thickening agents, stabilizers, and preservatives.
  • Oral administration, parenteral administration, subcutaneous administration and intravenous administration are the preferred methods of administration.
  • the dosage of the compounds of the present invention varies depending on age, weight, symptom, therapeutic efficacy, dosing regimen and/or treatment time. Generally, they may be administered by oral or inhalation routes, in an amount of 1 mg to 100 mg per time, from once a couple of days, once 3 days, once 2 days, once a day to a couple of times a day, in the case of an adult, or continuously administered by oral or inhalation routes from 1 to 24 hours a day. Since the dosage is affected by various conditions, an amount less than the above dosage may sometimes work well enough, or higher dosage may be required in some cases.
  • the compounds of the present invention may be administered in combination with other drugs for (1) complementation and/or enhancement of prevention and/or therapeutic efficacy of the preventive and/or therapeutic drug of the present invention, (2) dynamics, absorption improvement, dosage reduction of the preventive and/or therapeutic drug of the present invention, and/or (3) reduction of the side effects of the preventive and/or therapeutic drug of the present invention.
  • a concomitant medicine comprising the compounds of the present invention and other drug may be administered as a combination preparation in which both components are contained in a single formulation, or administered as separate formulations.
  • the administration by separate formulations includes simultaneous administration and administration with some time intervals.
  • the compound of the present invention can be administered first, followed by another drug or another drug can be administered first, followed by the compound of the present invention.
  • the administration method of the respective drugs may be the same or different.
  • the dosage of the other drug can be properly selected, based on a dosage that has been clinically used.
  • the compounding ratio of the compound of the present invention and the other drug can be properly selected according to age and weight of a subject to be administered, administration method, administration time, disorder to be treated, symptom and combination thereof.
  • the other drug may be used in an amount of 0.01 to 100 parts by mass, based on 1 part by mass of the compound of the present invention.
  • the other drug may be a combination of two or more kind of arbitrary drugs in a proper proportion.
  • the other drug that complements and/or enhances the preventive and/or therapeutic efficacy of the compound of the present invention includes not only those that have already been discovered, but those that will be discovered in future, based on the above mechanism.
  • the concomitant medicine can be used for any diseases, as long as it complements and/or enhances the preventive and/or therapeutic efficacy of the compound of the present invention.
  • the compound of the present invention can be used with an existing chemotherapeutic concomitantly or in a mixture form.
  • the chemotherapeutic include an alkylation agent, nitrosourea agent, antimetabolite, anticancer antibiotics, vegetable-origin alkaloid, topoisomerase inhibitor, hormone drug, hormone antagonist, aromatase inhibitor, P-glycoprotein inhibitor, platinum complex derivative, other immunotherapeutic drugs and other anticancer drugs.
  • a cancer treatment adjunct such as a leucopenia (neutropenia) treatment drug, thrombocytopenia treatment drug, antiemetic and cancer pain intervention drug, concomitantly or in a mixture form.
  • the compound(s) of the present invention can be used with other immunomodulators and/or a potentiating agent concomitantly or in a mixture form.
  • the immunomodulator include various cytokines, vaccines and adjuvants.
  • these cytokines, vaccines and adjuvants that stimulates immune responses include but not limited to GM-CSF, M-CSF, G-CSF, interferon- ⁇ , ⁇ , or ⁇ , IL-1, IL-2, IL-3, IL-12, Poly (I:C) and C p G.
  • the potentiating agents includes cyclophosphamide and analogs of cyclophosphamide, anti-TGF ⁇ and Imatinib (Gleevac), a mitosis inhibitor, such as paclitaxel, Sunitinib (Sutent) or other antiangiogenic agents, an aromatase inhibitor, such as letrozole, an A2a adenosine receptor (A2AR) antagonist, an angiogenesis inhibitor, anthracyclines, oxaliplatin, doxorubicin, TLR4 antagonists, and IL-18 antagonists.
  • a mitosis inhibitor such as paclitaxel, Sunitinib (Sutent) or other antiangiogenic agents
  • an aromatase inhibitor such as letrozole
  • A2a adenosine receptor (A2AR) antagonist an angiogenesis inhibitor
  • anthracyclines oxaliplatin
  • doxorubicin TLR4 antagonists
  • alkyl refers to a hydrocarbon chain radical that includes solely carbon and hydrogen atoms in the backbone, containing no unsaturation, having from one to twenty carbon atoms (i.e., C 1-20 alkyl) or one to ten carbon atoms (i.e., C 1-10 alkyl) or one to five carbon atoms (i.e., C 1-5 alkyl) and which is attached to the rest of the molecule by a single bond, e.g., including but not limited to methyl, ethyl, propyl, butyl, isobutyl, sec-butyl, tert-butyl, isopentyl or neopentyl.
  • amino acid refers to amino acids having L or D stereochemistry at the alpha carbon.
  • “Pharmaceutically acceptable salt” is taken to mean an active ingredient, which comprises a compound of the formula (I) in the form of one of its salts, in particular if this salt form imparts improved pharmacokinetic properties on the active ingredient compared with the free form of the active ingredient or any other salt form of the active ingredient used earlier.
  • the pharmaceutically acceptable salt form of the active ingredient can also provide this active ingredient for the first time with a desired pharmacokinetic property which it did not have earlier and can even have a positive influence on the pharmacodynamics of this active ingredient with respect to its therapeutic efficacy in the body.
  • “Pharmaceutically acceptable” means that which is useful in preparing a pharmaceutical composition that is generally safe, non-toxic, and neither biologically nor otherwise undesirable and includes that which is acceptable for veterinary as well as human pharmaceutical use.
  • stereoisomer refers to any enantiomers, diastereomers, or geometrical isomers of the compounds of formula (I), wherever they are chiral or when they bear one or more double bond.
  • the compounds of the formula (I) and related formulae are chiral, they can exist in racemic or in optically active form. Since the pharmaceutical activity of the racemates or stereoisomers of the compounds according to the invention may differ, it may be desirable to use the enantiomers. In these cases, the end product or even the intermediates can be separated into enantiomeric compounds by chemical or physical measures known to the person skilled in the art or even employed as such in the synthesis.
  • diastereomers are formed from the mixture by reaction with an optically active resolving agent.
  • optically active acids such as the R and S forms of tartaric acid, diacetyltartaric acid, dibenzoyltartaric acid, mandelic acid, malic acid, lactic acid, suitable N-protected amino acids (for example N-benzoylproline or N-benzenesulfonylproline), or the various optically active camphorsulfonic acids.
  • optically active resolving agent for example dinitrobenzoylphenylglycine, cellulose triacetate or other derivatives of carbohydrates or chirally derivatised methacrylate polymers immobilised on silica gel.
  • subject includes mammals (especially humans) and other animals, such as domestic animals (e.g., household pets including cats and dogs) and non-domestic animals (such as wildlife).
  • domestic animals e.g., household pets including cats and dogs
  • non-domestic animals such as wildlife.
  • “Therapeutically effective amount” or “efficient amount” refers to sufficient amount of the compound(s) of the present invention that (i) treats or prevents the particular disease, disorder or syndrome (ii) attenuates, ameliorates or eliminates one or more symptoms of the particular disease, disorder or syndrome or (iii) prevents or delays the onset of one or more symptoms of the particular disease, disorder or syndrome described herein.
  • the therapeutically effective amount of the drug may decrease the number of cancer cells; decrease the cancer size; inhibit (i.e., slow to some extent and alternatively stop) cancer cell infiltration into peripheral organs; suppress (i.e., slow to some extent and alternatively stop) tumor metastasis; inhibit, to some extent, tumor growth; and/or relieve to some extent one or more of the symptoms associated with the cancer.
  • the therapeutic effective amount is an amount sufficient to decrease or alleviate an infectious diseases, the symptoms of an infections caused by bacterial, viral and fungal.
  • An embodiment of the present invention provides the preparation of compounds of formula (I) according to the procedures of the following examples, using appropriate materials. Those skilled in the art will understand that known variations of the conditions and processes of the following preparative procedures can be used to prepare these compounds. Moreover, by utilizing the procedures described in detail, one of ordinary skill in the art can prepare additional compounds of the present invention.
  • the starting materials are generally available from commercial sources such as Sigma-Aldrich, USA or Germany; Chem-Impex USA; G.L. Biochem, China and Spectrochem, India.
  • Analytical HPLC method Analytical HPLC was performed using on ZIC HILIC 200A° column (4.6 mm ⁇ 250 mm, 5 ⁇ m), Flow rate: 1.0 mL/min. The elution conditions used are: Buffer A: 5 mmol ammonium acetate, Buffer B: Acetonitrile, Equilibration of the column with 90% buffer B and elution by a gradient of 90% to 40% buffer B during 30 min.
  • Preparative HPLC Method B Prep HPLC was performed using on ZIC HILIC 200A° column (10 mm ⁇ 250 mm, 5 ⁇ m), Flow rate: 5.0 mL/min. The elution conditions used are: Buffer A: 5 mmol ammonium acetate, Buffer B: Acetonitrile, Equilibration of the column with 90% buffer B and elution by a gradient of 90% to 40% buffer B during 20 min.
  • LCMS was performed on AP1 2000 LC/MS/MS triple quad (Applied biosystems) with Agilent 1100 series HPLC with G1315 B DAD, using Mercury MS column or using Agilent LC/MSD VL single quad with Agilent 1100 series HPLC with G1315 B DAD, using Mercury MS column or using Shimadzu LCMS 2020 single quad with Prominence UFLC system with SPD-20 A DAD.
  • FIGS. 1A-1C illustrate Steps 1a to 1c.
  • Step 1a Sodium hydroxide (12.2 g, 305 mmol) and Cbz-Cl (12.5 g, 73 mmol) were added to a solution of compound 1a (10.0 g, 61 mmol) in water (100 mL) and stirred at room temperature for 3 h. The completeness of the reaction was confirmed by TLC analysis. The reaction mass was partitioned between citric acid solution and ethyl acetate. Organic layer was washed with water, brine, dried over Na 2 SO 4 and evaporated under reduced pressure to yield 11 g of compound 1b (Yield: 61.1%). LCMS: 298.0 (M+H) + .
  • Step 1b DIPEA (3.5 g, 26.8 mmol) was added slowly to a stirred solution of compound 1b (4.0 g, 13.4 mmol) and HATU (5.6 g, 14.7 mmol) in DMF (50 mL) and was allowed to stir at room temperature for 5 more min.
  • L-Ser( t Bu)-OMe.HCl (3.5 g, 20.1 mmol) was added slowly and stirred at room temperature for 12 h. The completeness of the reaction was confirmed by TLC analysis. The reaction mixture was quenched with ice, precipitated solid was filtered and re-crystallized with CH 2 Cl 2 to yield 6 g of compound 1c, LCMS: 454.8 (M+H) + .
  • Step 1c 99% Hydrazine hydrate solution (10 mL) was added slowly to a stirred solution of compound 1c (6 g) in methanol (50 mL) and stirred at room temperature for 2 h. The completion of the reaction was confirmed by TLC. The reaction mixture on evaporation under reduced pressure yielded 5.8 g of compound 1d. LCMS: 455.0 (M+H) + .
  • Step 1d DIPEA (3.3 g, 25.4 mmol) was added slowly to a stirred solution of compound 1d (5.8 g, 12.7 mmol), HATU (5.8 g, 15.2 mmol) in DMF (50 mL) and was allowed to stir at room temperature for 5 min. Fmoc-L-Asn-OH (4.9 g, 14.0 mmol) was further added to reaction mixture and stirred at room temperature for 12 h. The completeness of the reaction was confirmed by TLC analysis. The reaction mixture was then quenched with ice, precipitated solid was filtered and re-crystallized with CH 2 Cl 2 to yield 5.9 g of compound 1e, LCMS: 791.0 (M+H) + .
  • Step 1e Fmoc group of compound 1e [(5.9 g in CH 2 Cl 2 (60 mL)] was deprotected using diethylamine (60 mL) and the completion of the reaction was confirmed by TLC analysis. The reaction mixture on evaporation under reduced pressure yielded 1.6 g of compound 1f. LCMS: 568.8 (M+H) + .
  • Step 1f Compound 1l (1.3 g, 3.0 mmol) and compound 1f (1.60 g, 2.8 mmol) was dissolved in THF (10 mL) and stirred at room temperature. Coupling was initiated by the addition of triethylamine (0.57 g, 5.6 mmol) to the above reaction mixture and the reaction was allowed to stir for 12 h at room temperature. The completeness of the reaction was confirmed by TLC analysis. Organic layer was washed with NaHCO 3 , citric acid solution, brine, dried over Na 2 SO 4 and evaporated under reduced pressure to yield 0.45 g of compound1g.
  • Step 1g Cbz group and benzyl ester deprotection was carried out on compound 1g (0.45 g) in methanol using palladium hydroxide (0.5 g) for 1 h at room temperature. The completeness of the reaction was confirmed by TLC analysis. Palladium hydroxide was removed by Celite® bed filtration and the filtrate was evaporated under reduced pressure to yield 0.34 g of compound 1h. LCMS: 636.0 (M+H) + .
  • Step 1h Cyclization of compound 1h (0.1 g, 0.15 mmol) was carried out using HOBT (0.06 g, 0.47 mmol) and PyBOP (0.24 g, 0.47 mmol) in THF (50 mL). The reaction was initiated by slow addition of DIPEA (0.06 g, 0.47 mmol) and further stirred at room temperature for 12 h. The reaction mixture was evaporated and washed with diethyl ether to yield 0.05 g of compound1i. LCMS: 617.9 (M+H) + .
  • FIGS. 2A-2B illustrates Steps 2a and 2h.
  • Step 2a DIPEA (2.71 g, 21 mmol) was added slowly to a stirred solution of compound 1b (3.12 g, 10.5 mmol), HATU (4.41 g, 11.6 mmol) in DMF (30 mL) and was allowed to stir at room temperature for 5 min.
  • D-Thr( t Bu)-OMe.HCl 2.0 g, 10.5 mmol was added slowly and stirred at room temperature for 12 h. The completeness of the reaction was confirmed by TLC analysis. The reaction mixture was then quenched with ice, precipitate was filtered and re-crystallized with CH 2 Cl 2 to yield 4.2 g of compound 2a.
  • Step 2b 99% Hydrazine hydrate solution (5 mL) was added slowly to a stirred solution of compound 2a (4.2 g) in methanol (40 mL) and the completion of the reaction was confirmed by TLC analysis. The reaction mixture on evaporation under reduced pressure yielded 4.2 g of compound 2b (Yield: 90%). LCMS: 469.4 (M+H) + .
  • Step 2c DIPEA (2.7 mL, 20.9 mmol) was added slowly to a stirred solution of compound 2b (4.9 g, 10.5 mmol), HATU (4.8 g, 12.5 mmol) in DMF (50 mL). To the above stirred solution, Fmoc-D-Asn(Trt)-OH (6.2 g, 10.5 mmol) was added and further stirred at room temperature for 12 h. The completeness of the reaction was confirmed by TLC analysis.
  • reaction mixture was diluted with EtOAc (30 mL) and washed with 1.0 M sodium carbonate (20 mL ⁇ 2), 10% citric acid (20 mL ⁇ 2), water (20 mL ⁇ 2), dried over Na 2 SO 4 and evaporated under reduced pressure to yield 10 g of crude intermediate 2c and was further purified by silica gel column chromatography (eluent: 0-5% MeOH in EtOAc) to yield 5 g of compound 2c.
  • Step 2d Fmoc deprotection of compound2c [(3.2 g) in CH 2 Cl 2 (10 mL)] was carried out using diethylamine (10 mL). The completion of the reaction was confirmed by TLC analysis. The resulting solution on evaporation under reduced pressure yielded 1.2 g of compound 2d.
  • Step 2e Triethylamine (0.32 g, 3.2 mmol) was added slowly to initiate the coupling of compound 2d (1.3 g, 1.6 mmol) and compound 2h (0.79 g, 1.9 mmol) in THF (20 mL). The resulting solution was further allowed to stir for 12 h at room temperature and completeness of the reaction was confirmed by TLC analysis. Organic layer was washed with NaHCO 3 , citric acid solution, brine, dried over Na 2 SO 4 and evaporated under reduced pressure to yield 1.3 g of compound 2e.
  • Step 2f Cbz group and benzyl ester deprotection was carried out on compound 2e (1.3 g) in methanol using palladium hydroxide (1.0 g) for 1 h at room temperature. The completeness of the reaction was confirmed by TLC analysis. Palladium hydroxide was removed by Celite® bed filtration and the filtrate was evaporated under reduced pressure to yield 0.45 g of compound 2f. LCMS: 878.4 (M+H) + .
  • Step 2g DIPEA (0.2 g, 1.5 mmol) was added slowly to a stirred solution of compound 2f (0.45 g, 0.51 mmol), HOBT (0.21 g, 1.53 mmol) and PyBOP (0.8 g, 1.53 mmol) in THF (200 mL). The reaction mixture was further stirred at room temperature for 12 h. The completeness of the reaction was confirmed by TLC analysis. The reaction mixture was evaporated and washed with diethyl ether to yield 0.41 g of intermediate 2g. LCMS: 860.7 (M+H) + .
  • FIGS. 3A-3C illustrates Steps 3a and 3k.
  • Step 3b DIPEA (6.5 mL, 37.8 mmol) was added slowly to a stirred solution of compound 3b (5 g, 12.6 mmol), compound 3c (2.72 g, 15 mmol), HOBt (2.55 g, 18.9 mmol) and EDC.HCl (3.62 g, 18.9 mmol) in DMF (75 mL) at 0° C.
  • the reaction mixture was further stirred at room temperature for 12 h. The progress of the reaction was confirmed by TLC analysis.
  • the reaction mass was partitioned between ethyl acetate and water. Organic layer was washed with water, brine, dried over Na 2 SO 4 and evaporated under reduced pressure to yield crude.
  • Step 3c To a stirred solution of compound 3d (5 g, 8.9 mmol) in dry DCM, diethylamine (50 mL) was added dropwise at ⁇ 10° C. and stirred for 1 h at room temperature. After completion of reaction, the mixture was evaporated under reduced pressure to give crude compound. The crude was purified with (1:1) n-pentane/diethyl ether wash and dried under high vacuum to yield 3.5 g of compound 3e.LCMS: 338.58 (M+H) + .
  • Step 3d NMM (1.4 mL, 14.0 mmol) was added slowly to a stirred solution of compound 3a (3 g, 11.3 mmol), compound 3e (4.3 g, 12.9 mmol) and HATU (6.5 g, 17.1 mmol) in DMF (75 mL) at 0° C.
  • the reaction mixture was further stirred for 6 h at room temperature. Progress of reaction was monitored by TLC. After completion, the reaction mass was partitioned between ethyl acetate and water. Organic layer was washed with water, brine, dried over Na 2 SO 4 and evaporated under reduced pressure to give crude compound.
  • the crude was purified by silica gel column chromatography (Eluent: 50% hexane in ethyl acetate) to yield 4.8 g of compound 3f, LCMS: 583.7 (M+H) + .
  • Step 3e To a stirred solution of compound 3f (4.5 g, 7.7 mmol) in MeOH, Pd/C (2.0 g) was added slowly and stirred under H 2 atmosphere for 4 h at room temperature. Progress of reaction was monitored by TLC. After completion, the reaction mass was filtered through Celite® and washed with MeOH (2 ⁇ 150 mL). The resulting filtrate was evaporated under reduced pressure to yield 3 g of compound 3g LCMS: 448.6 (M+H) + .
  • Step 3f To a stirred solution of Cbz-D-Asn-OH (1.78 g, 6.7 mmol) and compound 3g (3.0 g, 6.8 mmol) in DMF (75 mL), DCC (4.12 g, 20.3 mmol) and HOBT (1.8 g, 13.5 mmol) were added slowly at 0° C. The reaction mixture was stirred for 48 h at room temperature. Progress of reaction was monitored by TLC. After completion, the reaction mass was partitioned between ethyl acetate and water. Organic layer was washed with water, brine, dried over Na 2 SO 4 and evaporated under reduced pressure to yield crude. The crude compound was purified by silica gel (60-120 mesh) column chromatography (Eluent: 4% MeOH in DCM) to yield 2.5 g of Compound 3h, LCMS: 697.50 (M+H) + .
  • Step 3g To a stirred solution of compound 3h (2.5 g, 3.6 mmol) in MeOH (50 mL), Pd/C (1.2 g) was added and stirred under H 2 atmosphere for 4 h at room temperature. Progress of reaction was monitored by TLC. After completion, the reaction mass was filtered through Celite® and washed with MeOH (2 ⁇ 150 mL). The resulting filtrate was evaporated under reduced pressure to yield 1.5 g of compound 3i, LCMS: 563.6 (M+H) + .
  • Step 3h Compound 3i (1.3 g, 2.3 mmol), TEA (0.43 mL, 3.5 mmol) in DMF (25 mL) and was added dropwise slowly to a solution of 3j(1.1 g, 2.6 mmol) at ⁇ 10° C. The mixture was further stirred at room temperature for 2h. Progress of reaction was monitored by TLC. After completion, the reaction mass was partitioned between ethyl acetate and water. Organic layer was washed with NaHCO 3 , citric acid solution, brine, then organic layer was dried over Na 2 SO 4 and evaporated under reduced pressure to give crude.
  • Step 3i To a solution of compound 3k (1.0 g, 1.2 mmol) in CH 2 Cl 2 (10 mL), trifluoroacetic acid (10 mL) and catalytic amount of triisopropylsilane were added and stirred for 3 h at room temperature to remove the acid sensitive protecting groups. The resulting solution was concentrated in vacuum and washed with diethyl ether to afford 1.0 g of crude compound 31, LCMS: 628.65 (M+H) + .
  • Step 3j To a stirred solution of compound 31 (1.0 g, 1.5 mmol) in THF, PyBOP (2.4 g, 4.7 mmol), HOBT (0.6, 4.7 mmol) and DIPEA (0.8 mL, 4.7 mmol) were added slowly and stirred for 12 h at room temperature. The reaction mass was partitioned between water and ethyl acetate. Organic layer was washed with water, brine, dried over Na 2 SO 4 and evaporated under reduced pressure to give crude. Crude compound was washed with diethyl ether to yield 0.8 g of compound 3m, LCMS: 610.5 (M+H) + .
  • Step 3k To a stirred solution of compound 3m (0.8 g, 1.3 mmol) in MeOH (30 mL), Pd(OH) 2 (0.4 g) was added and stirred under H 2 atmosphere for 4 h at room temperature. Progress of reaction was monitored by TLC. After completion, the reaction mass was filtered through Celite® and washed with MeOH (2 ⁇ 150 mL). The resulting filtrate was evaporated under reduced pressure to yield 0.7 g of compound3.
  • LCMS: 520.5 (M+H) + ; HPLC: t R 9.9 min.
  • Example 2 The compound was synthesised using similar procedure as depicted in Example 2 (compound 2) using 7-aminoheptanoic acid instead compound 1a to yield0.3 g crude material of the title compound.
  • mice PD-L1 Recombinant mouse PD-L1 (rm-PDL-1, cat no: 1019-B7-100; R&D Systems) were used as the source of PD-L1.
  • Splenocytes harvested in a 50 mL falcon tube by mashing mouse spleen in a 40 ⁇ m cell strainer were further treated with 1 ml ACK lysis buffer for 5 mins at room temperature. After washing with 9 mL of RPMI complete media, cells were re-suspended in 3 ml of 1 ⁇ PBS in a 15 mL tube. 3 mL of Histopaque was added carefully to the bottom of the tube without disturbing overlaying splenocyte suspension. After centrifuging at 800 ⁇ g for 20 min. at room temperature, the opaque layer of splenocytes was collected carefully without disturbing/mixing the layers. Splenocytes were washed twice with cold 1 ⁇ PBS followed by total cell counting using Trypan Blue exclusion method and used further for cell based assays.
  • Splenocytes were cultured in RPMI complete media (RPMI+10% fetal bovine serum+1 mM sodium pyruvate+10,000 units/mL penicillin and 10,000 ⁇ g/mL streptomycin) and maintained in a CO 2 incubator with 5% CO 2 at 37° C.
  • RPMI complete media RPMI+10% fetal bovine serum+1 mM sodium pyruvate+10,000 units/mL penicillin and 10,000 ⁇ g/mL streptomycin
  • CFSE is a dye that passively diffuses into cells and binds to intracellular proteins. 1 ⁇ 10 6 cells/ml of harvested splenocytes were treated with 5 ⁇ m of CFSE in pre-warmed 1 ⁇ PBS/0.1% BSA solution for 10 mins at 37° C. Excess CFSE was quenched using 5 volumes of ice-cold culture media to the cells and incubated on ice for 5 min. CFSE labelled splenocytes were further given three washes with ice cold complete RPMI media.
  • CFSE labelled 1 ⁇ 10 5 splenocytes added to wells containing either MDA-MB231 cells (1 ⁇ 10 5 cells cultured in high glucose DMEM medium) or recombinant human PDL-1 (100 ng/mL) and test compounds.
  • Splenocytes were stimulated with anti-mouse CD3 and anti-mouse CD28 antibody (1 ⁇ g/mL each), and the culture was further incubated for 72 h at 37° C. with 5% CO 2 .
  • Cells were harvested and washed thrice with ice cold FACS buffer and % proliferation was analysed by flow cytometry with 488 nm excitation and 521 nm emission filters.
  • Percent splenocyte proliferation was analysed using cell quest FACS program and percent rescue of splenocyte proliferation by compound was estimated after deduction of % background proliferation value and normalising to % stimulated splenocyte proliferation (positive control) as 100%.

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