申请人:Ravizza SpA
公开号:US04652654A1
公开(公告)日:1987-03-24
A process for preparing 2(4-fluorophenyl).alpha.-methyl-5-benzoxazole acetic acid starting from 4-hydroxy-3-amino-phenylacetic acid, which is firstly reacted with 4-fluorobenzoyl chloride, and the product obtained is reacted with phosphoric acid; the 2(4-fluorophenyl)5-benzoxazole acetic acid obtained in this manner is esterified with ethyl alcohol, and the ester is treated with diethyloxalate; the ethyl 2(4-fluorophenyl)5-benzoxazole oxalacetate obtained is reacted with formaldehyde and potassium carbonate to obtain ethyl 2(4-fluorophenyl)5-benzoxazole acrylate, which is hydrolysed to obtain the corresponding acid, from which the 2(4-fluorophenyl).alpha.-methyl-5-benzoxazole acetic acid is obtained by hydrogenation.
从4-羟基-3-氨基苯乙酸开始制备2(4-氟苯基)α-甲基-5-苯并噁唑乙酸的过程,首先将其与4-氟苯甲酰氯反应,得到的产物与磷酸反应;以这种方式获得的2(4-氟苯基)5-苯并噁唑乙酸与乙醇酯化,酯经过乙酰乙酸二乙酯处理;得到的乙酸2(4-氟苯基)5-苯并噁唑草酸酯与甲醛和碳酸钾反应,得到乙酸2(4-氟苯基)5-苯并噁唑丙烯酸酯,将其水解得到相应的酸,通过氢化得到2(4-氟苯基)α-甲基-5-苯并噁唑乙酸。