A simple and highly concise strategy has been developed for the stereoselective total synthesis of leiocarpin C starting from commercially available mandelic ester. The strategy utilizes the OsO4‐catalyzed cis‐hydroxylation and selective reduction with K‐Selectride as key steps.
A simple and highly efficient first total synthesis Of cytotoxic (+)-crassalactone A starting from (R)-mandelic acid is described. The strategy involves the osmium tetroxide-catalyzed cis-hydroxylation and the stereoselective addition of ethyl lithiopropiolate to a chiral aldehyde intermediate as key steps. (C) 2009 Elsevier Ltd. All rights reserved.
Easy access to an enantiopure precursor of (+)-goniodiol
Asymmetric synthesis of the epoxide 2 has been achieved from (R)-mandelic acid 3 via highly diastereoselective Wittig reaction and erythro-selective OsO4 catalyzed cis-hydroxylation as key steps. Copyright (C) 1996 Elsevier Science Ltd