Optically active maytansinoids and maytansinoid production method
申请人:Takeda Chemical Industries, Ltd.
公开号:US04190580A1
公开(公告)日:1980-02-26
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.