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Enantioselective organocatalytic tandem Michael-Aldol reactions: one-pot synthesis of chiral thiochromenes.
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Abstract
A highly enantioselective (S) diphenylpyrrolinol silyl ether promoted tandem Michael-aldol reaction of alpha,beta-unsaturated aldehydes with 2-mercaptobenzaldehydes has been developed. The method affords one-pot access to chiral and synthetically useful thiochromenes in high yields and high enantioselectivities from readily available compounds.