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    • 7. 发明授权
    • Thiazolylpropenedicarboxylic acid half esters and process for making
    • 噻唑基丙二酸半酯及其制备方法
    • US4652652A
    • 1987-03-24
    • US746564
    • 1985-06-19
    • Hiromu MatsumuraToshisada Yano
    • Hiromu MatsumuraToshisada Yano
    • C07D277/20C07D277/38C07D277/40C07D277/42C07D277/44C07D277/46C07D277/48
    • C07D277/20C07D277/40C07D277/42C07D277/46C07D277/48Y02P20/55
    • A useful intermediate for synthesizing penicillins or cephalosporins {i.e., 1-(2-protected amino-4-thiazolyl)propene-1,3-dicarboxylic acid half ester (VI)} is prepared by a process comprising (1) treating haloacetylmalonic acid ester (I) with thiourea to give 2-(2-amino-4-thiazolyl)malonic acid ester (II), (2) protecting the amino group of the latter to give 2-(2-protected amino-4-thiazolyl)malonic acid ester (III), (3) treating the product with haloalkenoic acid ester to give 1-(2-protected amino-4-thiazolyl)-2-propene-(1,1,3-tri or 1,1,3,3-tetra)carboxylic acid ester (IV), (4) hydrolyzing and decarboxylating the latter to give 1-(2-protected amino-4-thiazolyl)propene-1,3-dicarboxylic acid (V), and (5) treating the product with alcohol and a hemi-esterifying reagent to give the objective 1-(2-protected amino-4-thiazolyl)propene-1,3-dicarboxylic acid half ester (VI).
    • 用于合成青霉素或头孢菌素(即,1-(2-保护的氨基-4-噻唑基)丙烯-1,3-二羧酸半酯(VI)}的有用中间体是通过以下方法制备的:(1)将卤代乙酰基丙二酸酯 (I)与硫脲反应,得到2-(2-氨基-4-噻唑基)丙二酸酯(II),(2)保护后者的氨基,得到2-(2-保护的氨基-4-噻唑基)丙二酸 酸酯(III),(3)用卤代链烯酸酯处理产物得到1-(2-保护的氨基-4-噻唑基)-2-丙烯 - (1,1,3-三或1,1,3, (IV),(4)使其后水解和脱羧,得到1-(2-保护的氨基-4-噻唑基)丙烯-1,3-二羧酸(V),和(5)处理 产物与醇和半酯化试剂反应得到目的1-(2-保护的氨基-4-噻唑基)丙烯-1,3-二羧酸半酯(VI)。