procedures for the extraction of vincristine or n - desmethylvinblastin

摘要

Title cpd. (I) useful as an antileukemia agent is prepd. by oxidising vinblastine with chromic acid at a low temp. sepg. the mixt. including N-dimethyl vinblastine (II) formylating (II) and sepg. (I), esp. by chromatography.