摘要:
Subjection of (5R, 6R)-(-)-3,6-dimethyl-5-trimethylstannyl-2-cyclohexen-1-one (11) to appropriate annulation sequences provides the cis-fused ketones 15, 20, and 21, which, upon reduction (Li, NH3, THF,t-BuOH) are converted smoothly into the enantiomerically pure bicyclic alcohols 16, 22, and 23, respectively. Compound 16 is readily transformed into the unichiral ketones 6 and 7.