作者:Masao Shiozaki、Noboru Isihida、Kimio Iino、Tetsuo Hiraoka
DOI:10.1016/0040-4020(80)80149-9
日期:1980.1
Cephamycin derivatives 16b, c which were synthesized from the naturally occurring cephamycin C (16a) were converted to the corresponding oxamic acid derivatives 17a, e respectively by the reaction with oxalyl chloride and successive treatment with water. The reaction of the oxamic acid 17a with diphenylcarbodiimide gave 7-aminocephamycinoic acid (7-ACMA) benzhydryl ester (21a) which was further converted
描述了头霉素的7-酰胺基团的裂解和一些修饰。头霉素衍生物部16b,Ç这是从天然存在的头霉素C(合成16A)转化为相应的草氨酸衍生物17A,ê通过与草酰氯,并用水连续处理的反应分别。乙酰胺酸17a与二苯基碳二亚胺的反应得到7-氨基头孢菌酸(7-ACMA)二苯甲酸酯(21a),其进一步转化为头孢西丁(21c)。这些化合物17a,b,c,d,ê,˚F从而从头霉素C中获得似乎是头霉素类似物的合成有利中间体如头孢美唑(28C)。