Synthetic studies on (+)-bucidarasin C: two diastereoselective transannular reactions producing cis-decaline derivatives that show reversal selectivity
摘要:
This manuscript describes studies on the construction of the cis-decaline core of (+)-bucidarasin C. The transannular Diels-Alder (TADA) reaction of a macrocyclic lactone successfully afforded the desired cis-decaline derivative in a stereoselective manner. On the other hand, the stereoselective transannular cascade Michael (TACM) reaction of the parent macrocyclic lactone afforded the diastereomeric cis-decaline derivative as the major product. (C) 2012 Elsevier Ltd. All rights reserved.
Enantioselective Total Synthesis of (+)-Bucidarasins A and C
摘要:
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-benzyloxymethy1-2-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.