New cytotoxic bufadienolides from the biotransformation of resibufogenin by Mucor polymorphosporus
作者:Min Ye、Jian Han、Dongge An、Guangzhong Tu、Dean Guo
DOI:10.1016/j.tet.2005.07.012
日期:2005.9
biotransformation of resibufogenin by Mucor polymorphosporus afforded 22 products, and 15 of them were new. The transformation reactions involved hydroxylations at C-1β, C-5, C-7α, C-7β, C-12α, C-12β and C-16α, as well as epimerization or dehydrogenation of 3-OH. Hydroxylations at C-12α, C-12β and C-16α were the major reactions, each giving products in >5% yields, whereas the other products were obtained in fairly
Resibufogenin是一种从中药ChanSu中分离出来的细胞毒性类固醇。Mucor polymorphosporus对瑞布非生素的生物转化提供了22种产品,其中15种是新产品。转化反应涉及C-1β,C-5,C-7α,C-7β,C-12α,C-12β和C-16α的羟基化,以及3-OH的差向异构或脱氢。C-12α,C-12β和C-16α处的羟基化反应是主要反应,各自产生的产品收率> 5%,而其他产品的收率却很低。一些产品显示出降低的但仍然有效的细胞毒性。这项研究为制备新的丁二烯内酯提供了一种有用的方法,其中大多数很难通过化学手段获得。