A Practical Synthetic Method for 3-(N,N-Disubstituted Carbamoyloxy)methyl Cephems without Generating the .DELTA.2-Isomers.
作者:Shigeto NEGI、Motosuke YAMANAKA、Yuki KOMATSU、Akihiko TSURUOKA、Atsushi KAMADA、Itaru TSUKADA、Yoshimasa MACHIDA
DOI:10.1248/cpb.43.1031
日期:——
E1101, a new oral caphalosporin, has a (N, N-dimethylcarbamoyloxy)methyl group at the C-3 position of the cephem nucleus. The previous methods for manufacturing 3-(N, N-disubstituted carbamoyloxy)methyl cephems generate various amounts of intractable Δ2 isomers as by-products. In this report, we describe a new, practical synthetic method for cephems of this type without generating Δ2 isomers, via 7-acylamino-3-(4-nitrophenoxy-carbonyloxy)methyl-Δ3-cephem-4-carboxylic acid (5) as a key intermediate.
E1101 是一种新型口服头孢菌素,在头孢菌素核的 C-3 位上有一个(N,N-二甲基氨基甲酰氧基)甲基。以往生产 3-(N,N-二取代氨基甲酰氧基)甲基头孢菌素的方法会产生不同数量的难以处理的Δ2 异构体作为副产品。在本报告中,我们介绍了一种以 7-酰氨基-3-(4-硝基苯氧基-碳酰氧基)甲基-Δ3-头孢-4-羧酸 (5) 为关键中间体、不产生 Δ2 异构体的新型实用头孢合成方法。