[reaction: see text] Reduction of alpha,alpha-disubstituted thioglycolate amides with lithium di-tert-butylbiphenylide affords alpha,alpha-disubstituted enolates with high Z/E selectivity. Transmetalation of the enolates with dicyclohexylboron bromide facilitates highly diastereoselective aldol reaction with aromatic and alpha,beta-unsaturated aldehydes.
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