Process for the preparation of 7-aminocephalosporanic acids
    2.
    发明授权
    Process for the preparation of 7-aminocephalosporanic acids 失效
    制备7-氨基头孢菌酸的方法

    公开(公告)号:US3932392A

    公开(公告)日:1976-01-13

    申请号:US433336

    申请日:1974-01-14

    CPC分类号: C07D501/18

    摘要: 7-Aminocephalosporanic acid (7-ACA) and 7-amino-3-methyl-3-cephem-4-carboxylic acid (7-ADCA) are valuable intermediates in the preparation of semi-synthetic cephalosporins. These compounds are commonly prepared by cleaving the amide bond of compounds having the formula ##SPC1##In which R.sup.6 is H or ##EQU1## R is the side chain of a known penicillin, especially phenoxymethyl or benzyl, and the amino and carboxyl functions are blocked; byA. halogenating the blocked compounds Ia or IIa to produce an imino-halide;B. forming an imino-ether from the imino-halide by treatment with an alcohol; andC. mixing said imino-ether with water or an alcohol to produce 7-aminocephalosporanic acid or 7-amino-3-methyl-3-cephem-4-carboxylic acid.The invention claimed is the use of dicyclohexylamine or diisopropylamine instead of a tertiary amine acid scavenger in step A.

    摘要翻译: 7-氨基头孢烷酸(7-ACA)和7-氨基-3-甲基-3-头孢烯-4-羧酸(7-ADCA)是制备半合成头孢菌素的有价值的中间体。 这些化合物通常通过切割具有式I的化合物的酰胺键来制备,其中R 6是H或O ORALALAL -OC-CH 3,R是已知的青霉素的侧链,特别是苯氧基甲基或苄基,氨基和羧基官能团是 封闭 通过A.将封闭的化合物Ia或IIa卤化以产生亚氨基卤化物; B.通过用醇处理从亚氨基卤化物形成亚氨基醚; 和C.将所述亚氨基醚与水或醇混合以产生7-氨基头孢烷酸或7-氨基-3-甲基-3-头孢烯-4-羧酸。