Maytansinoid compounds are produced by (a) treating a compound of the formula ##STR1## wherein alk is ##STR2## --CH.sub.2 CH.sub.2 CH.sub.3 or ##STR3## under conditions of reductive hydrolysis to yield maytinsinol; and (b) contacting the maytansinol with an acid of the formula ##STR4## wherein R is lower alkyl, in the presence of a carbodiimide to yield a maytansinoid. In accordance with a second aspect of the invention there is provided a D-form maytansinoid with respect to the asymmetric center at the 2'-position having the formula: ##STR5## wherein R is a lower alkyl group.
Maytansinoid类化合物是通过以下步骤制备的:(a)用还原
水解的条件处理化合物的公式为 ##STR1## 其中 alk 为 ##STR2## --CH.sub.2 CH.sub.2 CH.sub.3 或 ##STR3## 以得到maytinsinol; (b) 在存在碳二
亚胺的情况下,将maytansinol与公式为 ##STR4## 的酸接触,其中 R 为低烷基,以得到maytansinoid。根据本发明的第二个方面,提供了一种关于2'-位置不对称中心的D型maytansinoid,其
化学式为: ##STR5## 其中R为低烷基。