Process for preparing isoxazole and furan derivatives

Details Process for preparing isoxazole and furan derivatives Process for preparing isoxazole and furan derivatives

C - Chemistry, Metallurgy

07

D

167/215, 167/235

C07D 413/02 (2006.01) A61K 31/42 (2006.01) A61K 31/535 (2006.01) C07D 261/08 (2006.01) C07D 413/12 (2006.01) C07D 417/12 (2006.01)

Patent

CA 1299176

A B S T R A C T A process for preparing a compound of the formula Image I is disclosed, which comprises (a) to prepare a compound without a double bond in the 4,5-position of the oxazole or oxazine ring and wherein R is hydrogen or lower-alkyl of 1-3 carbon atoms cyclizing a compound of the formula Image wherein Hal' is chlorine or bromine, by heating the latter in an inert solvent in the presence of an acid-acceptor, excluding compounds wherein Y is an alkylene bridge interrupted by an olefinic linkage; or (b) to prepare a compound wherein X is 0, reacting a compound of the formula Image wherein Hal is chlorine, bromine or iodine, with an alkali metal salt of a compound of the formula Image , excluding compounds wherein R1 and R2 are lower- alkoxycarbonyl.

512264

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