Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
  • C07D239/70—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings condensed with carbocyclic rings or ring systems
  • C07D239/72—Quinazolines; Hydrogenated quinazolines
  • C07D239/78—Quinazolines; Hydrogenated quinazolines with hetero atoms directly attached in position 2
  • C07D239/80—Oxygen atoms
  • C07D239/82—Oxygen atoms with an aryl radical attached in position 4

Definitions

• starting material (1) can be prepared by the process disclosed in U.S. Patent No. 3,398,139.
• the present invention relates to an improved process for making such N-methylaminobenzophenone anti-oximes, and novel intermediates used in the improved process.
• the present invention relates to a new process for the preparation of N-methylaminobenzophenone anti-oximes by alkylation, and subsequent hydrolysis, of the corresponding quinazoline oxides.
• the preparation of compounds of Formula III is accomplished in two interrelated stages.
• reaction products of Formula II (X, Y as defined) are then hydrolytically converted in the presence of base to the methylaminobenzophenone anti-oximes of Formula III (X, Y as defined).
• compounds of formula II which are preferred as intermediates are those where X is chlorine or bromine. More preferred compounds of formula II are those where X is chlorine or bromine and Y is hydrogen, chlorine or fluorine.
• Most preferred compounds are those where X is chlorine or bromine and Y is hydrogen or fluorine.
• 1-Methylquinazolinone oxides of Formula II can be prepared by treating a solution or mixture of a compound of Formula I, prepared as taught by Sulkowski and Childress, J. Org. Chem., 27 4424 (1962) or by the improved process disclosed by Middleton in copending U.S. Patent Application Serial Number filed simultaneously herewith (attorney's docket number CR-7794), and a suitable base with an alkylating agent in an inert organic solvent medium.
• the reaction is preferentially carried out at moderate temperatures of 50-75°, but this step can be effected at room temperature.or above.
• Suitable solvents include, but are not limited to, ethers such as tetrahydrofuran,.diethyl ether and glyme; amides of secondary amines such as N,N-dimethylformamide and N,N-dimethylacetamide.
• Representative bases useful in the generation of the alkali metal salt of a compound of Formula I include, but are not limited to, potassium carbonate, sodium hydride, sodium carbonate and sodium or potassium alkoxides such as sodium ethoxide or methoxide.
• the alkylated quinazolinone oxides can be isolated from the reaction mixture by conventional means, such as filtration of the insoluble product.
• the compound of Formula II can then be converted to the anti-oxime by heating with a base in an aqueous- alcoholic solvent.
• a base in an aqueous- alcoholic solvent.
• the reaction is conveniently carried out at the reflux temperature of the solvent.
• Useful alcoholic solvents include, but are not limited to, ethanol, methanol, propanol, isopropanol, butanol, 2-methoxyethanol, ethylene glycol and propylene glycol.
• suitable bases are alkali metal (such as sodium and potassium) hydroxides, carbonates and bicarbonates.
• the alkylaminobenzophenone anti-oximes obtained can be purified by evaporation of the reaction solvent and recrystallization of the solid residue.
• the yellow solid was dissolved in 350 ml of hot 1-chlorobutane. This hot viscous solution was filtered through a coarse fritted glass funnel. The filter and empty flask were thoroughly rinsed with exactly 150 ml of 1-chlorobutane and added to the filtrate. A total of only 500 ml of 1-chlorobutane was used. On addition of 2,000 ml of hexane to the chlorobutane solution, the desired product precipitated out.
• the anti-5-chloro-2-(N-methylamino)benzophenone oxime was obtained either in 88% yield (crystalline form "a", m.p. 90-91°) or 80% yield (crystalline form "b", m.p.
• the anti-oxime obtained exists in two different crystalline modifications. Their solid infrared spectra differ, as do color and solubility. The least soluble crystalline form, "a” precipitates out immediately on addition of hexane to the 1-chlorobutane solution. It is quite yellow, fluffy and obtained in good yield. The crystalline form "b” is more soluble and is obtained when hexane addition does not cause rapid precipitation, but rather a slow crystallization which requires thorough cooling. The material is pale yellow and crystalline.
• Table I shows additional 1-methylquinazolinone 3-oxides that can be prepared by the processes disclosed and illustrated above using the appropriate quinazolinone 3-oxide and a suitable methylating agent.
• Table II shows additional methylaminobenzophenone anti-oximes that can be prepared by the processes disclosed and illustrated above using the appropriate 1-methylquinazolinone 3-oxide and a suitable base.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Plural Heterocyclic Compounds (AREA)
• Medicinal Preparation (AREA)
• Medicines Containing Plant Substances (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=25195499

Family Applications (1)

Country Status (17)

Families Citing this family (1)

Citations (2)

Family Cites Families (1)

• 1977
  • 1977-06-16 US US05/807,074 patent/US4160092A/en not_active Expired - Lifetime
• 1978
  • 1978-04-24 DK DK176478A patent/DK176478A/da not_active Application Discontinuation
  • 1978-06-09 AR AR272533A patent/AR218668A1/es active
  • 1978-06-15 ES ES470829A patent/ES470829A1/es not_active Expired
  • 1978-06-15 NZ NZ187582A patent/NZ187582A/xx unknown
  • 1978-06-15 ZA ZA00783440A patent/ZA783440B/xx unknown
  • 1978-06-15 PT PT68173A patent/PT68173A/pt unknown
  • 1978-06-15 AU AU37138/78A patent/AU3713878A/en active Pending
  • 1978-06-15 EP EP78100162A patent/EP0000148A1/en not_active Withdrawn
  • 1978-06-15 IT IT24614/78A patent/IT1098333B/it active
  • 1978-06-15 NO NO782086A patent/NO782086L/no unknown
  • 1978-06-15 IL IL7854922A patent/IL54922A0/xx unknown
  • 1978-06-15 AT AT436778A patent/AT359057B/de not_active IP Right Cessation
  • 1978-06-16 SU SU782626798A patent/SU731893A3/ru active
  • 1978-06-16 GR GR56540A patent/GR64974B/el unknown
  • 1978-06-16 FI FI781929A patent/FI781929A/fi not_active Application Discontinuation
  • 1978-06-16 JP JP7368078A patent/JPS545989A/ja active Pending

Patent Citations (2)

Also Published As

Similar Documents

Legal Events