An improved process for the preparation of 5-[4-[[3-Methyl-4-oxo-3,4-dihydroquinazolin-2-yl]methoxy]benzyl]thiazolidine-2,4-dione of formula (1) which comprises: reducing the compound of formula (2′) where R represents a (C1-C4)alkyl group using Raney Nickel or Magnesium in alcohol having 1 to 4 carbon atoms or mixtures thereof, if desired reesterifying using sufphuric acid at a temperature in the range of 0° C. to 60° C. to obtain a compound of formula (3′) wherein R is as defined above, hydrolyzing the compound of formula (3′) wherein R is as defined above, by conventional methods to obtain the acid of formula (4), condensing the acid of formula (4) with N-methyl anthranilamide directly without any preactivation of the acid to produce the compound of formula (1) and if desired, converting the compound of formula (1) to pharmaceutically acceptable salts thereof by conventional methods.
改进的制备5-[4-[[3-甲基-4-氧代-3,4-二氢
喹唑啉-2-基]甲氧基]苄]
噻唑烷-2,4-二酮(式(1))的方法包括:使用Raney
镍或
镁在含有1至4个碳原子的醇或其混合物中还原式(2')的化合物,其中R表示(C1-C4)烷基,如果需要,使用
硫酸在0℃至60℃的温度范围内重新酯化,以获得式(3')的化合物,其中R如上所述,通过常规方法
水解式(3')的化合物,以获得式(4)的酸,将式(4)的酸与
N-甲基蒽酰胺直接缩合而不进行任何酸的预激活,以产生式(1)的化合物,如果需要,通过常规方法将式(1)的化合物转化为其药学上可接受的盐。