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Alpha-chloro ynones have been reduced using Noyori's Ru catalyst to furnish alpha-chloro propargylic alcohols with excellent enantioselectivity. These have been used as a common precursor for the preparation of (E)- and (Z)-2-hydroxy-3,4-unsaturated disubstituted sulfilimines. The latter serve as precursors for the highly regio- and stereoselective preparation of bromo carbamates.
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Raghavan et al. (2009) studied this question.
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