Abstract
Michael initiated ring closure reactions of bromosulfone 1 and γ-oxygenated (E)-α,β-unsaturated esters, which lead stereohomogeneously to trisubstituted methylenecylopentanes, proceed also with good facial selectivity. The use of nonracemic enoate 1 4 in these reactions led to the synethesis of enantiomerically pure cylcopentanone 1 7. The reason for the preferred anti-selective. Michael addition of enoate 1 4 with allyl and alkyl α-phenylsulfonyl lithiated reagents is discussed.
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