3 - carboxylic acids and 4 - desacetyl - 3 - carboxylic acids as well as esters of vinblastine, vincristine, and leurosidine

摘要

Vinblastine, vincristine and leurosidine are converted to 3-carboxylic acids and 4-desacetyl-3-carboxylic acids, useful as intermediates to prepare aliphatic esters thereof.