New process for preparing 2(4-fluorophenyl) alpha methyl-5-benzoxazole acetic acid
申请人:RAVIZZA S.p.A.
公开号:EP0182061A1
公开(公告)日:1986-05-28
A process for preparing 2(4-fluorophenyl)a-methyl-5-benzoxazole acetic acid starting from 4-hydroxy-3-aminophenylacetic 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)a-methyl-5-benzoxazole acetic acid is obtained by hydrogenation.
Process for preparing 2(4-fluorophenyl)alpha-methyl-5-benzoxazole acetic
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.