作者:Xin Teng、Ya-Fei Ji、Jian-An Jiang、Jiao-Jiao Zhai、Xin-Hong Yu
DOI:10.1055/s-0031-1289654
日期:2012.1
Cefcapene pivoxil monohydrochloride monohydrate, a broad spectrum third-generation cephalosporin for oral administration, was prepared by reacting three centers of 7β-amino-3-(hydroxymethyl)cephalosporinic acid (7-HACA), derived from 7β-aminocephalosporanic acid. The coupling of 7-HACA and (Z)-2-[2-(Boc-amino)thiazol-4-yl]pent-2-enoic acid, followed by carbamylation with chlorosulfonyl isocyanate, and precipitation with diisopropylamine gave the key intermediate, in which thiazole side chain and carbamoyl group had been introduced into the 7-amino and 3-hydroxymethyl groups of 7-HACA, respectively, in a continuous procedure. Afterwards, the intermediate was esterified with pivaloyloxymethyl iodide to complete the modification of the C4 carboxy group affording Boc-cefcapene pivoxil, from which the desired product was finally obtained by an economical Boc removal and successive formation of the hydrochloride in 36% overall yield on a decagram scale. This synthesis promises an easy entry to cefcapene pivoxil monohydrochloride monohydrate with convenient manipulation, simple isolation, and good yields; it is of potential value for production on an industrial scale.
Cefcapene pivoxil 单盐酸盐一水合物是一种广谱的三代头孢菌素,适用于口服给药。其制备方法是通过反应源自7β-氨基头孢烯酸(7-HACA)的7β-氨基-3-(羟甲基)头孢烯酸的三个中心。先将7-HACA与(Z)-2-[2-(Boc-氨基)噻唑-4-基]戊-2-烯酸偶联,随后用氯磺酰异氰酸酯进行氨基甲酰化,并用二异丙胺沉淀,得到了关键中间体,在连续过程中噻唑侧链和氨基甲酰基分别引入到7-HACA的7-氨基和3-羟甲基基团中。之后,该中间体与戊酸氧甲基碘进行酯化,完成C4羧基的修饰,得到Boc-cefcapene pivoxil,最终通过经济的Boc去除和随后的盐酸盐形成成功合成目标产物,整体收率为36%,规模在十克级。这种合成方法为生产cefcapene pivoxil 单盐酸盐一水合物提供了便捷的途径,操作简单,分离易行,收率良好,具有工业生产的潜在价值。