The torquoselectivity-controlled olefination of carbonyl compounds with ynolates affording tetrasubstituted alkenes is described. The E/Z selectivity is determined in the step consisting of electrocyclic ring opening of the β-lactone enolates (oxetenes) derived from cycloaddition of ynolates with carbonyl compounds. Theoretical calculations revealed that several secondary orbital interactions are critical for the high torquoselectivity. This methodology is a novel olefination for constructing multisubstituted olefins.
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