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delta-Hydroxy-alpha,beta-unsaturated carbonyl compounds were prepared in one step via the vinylogous Mukaiyama aldol reactions with O,O-silyl ketene acetals. Isopropyl alcohol as additive and tryptophane-based B-phenyloxazaborolidinone were required for obtaining the gamma-alkylated product in high enantioselectivities.
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Simsek et al. (2007) studied this question.
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