摘要:
[GRAPHICS]We have accomplished the total synthesis of (+/-)-culmorin from the readily available ketone (11 steps, 46% overall yield). The tricyclo[6.3.0.0(3,9)]undecan-10-one skeleton, the culmorin framework, was constructed via the intramolecular double Michael addition of the cyclopentenone having an alpha beta-unsaturated ester moiety by using LHMDS, The stereochemistry of newly generated four stereogenic centers was perfectly controlled by the reaction.