[reaction: see text] Applications of methodology for the synthesis of propargylic alcohols related to polyketide natural products were examined. Noyori's asymmetric transfer hydrogenation of alpha-chiral alkynones was found to be highly selective and catalyst controlled. Additions of TMS acetylene to alpha-chiral aldehydes, catalyzed by a Ti(O-i-Pr)(4)-BINOL complex, were diastereoselective but substrate dependent.
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Marshall et al. (2003) studied this question.
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