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Paper | Regular issue | Vol 91, No. 2, 2015, pp.332-350
Published online, 19th January, 2015
DOI: 10.3987/COM-14-13161
Enantioselective Total Synthesis of (+)-Bucidarasins A and C

Kenji Usui and Masahisa Nakada*

*Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan

Abstract

In this paper, the first total synthesis of (+)-bucidarasins A and C is described. The chiral starting material was successfully obtained via reduction using a CBS catalyst and selective mono-TBS ether formation of trans-2-benzyloxymethyl-2-methylcyclohexane-1,3-diol, which was crucial to the successful enantioselective total synthesis of (+)-bucidarasins A and C. A synthetic approach towards (+)-bucidarasin C, based on the Barton-McCombie protocol, using V-70 as a radical promoter at low temperature to remove the C6-hydroxy moiety is also described.