Abstract
Dichloroindium hydride generated by the transmetallation between tributyltin hydride and indium trichloride predominantly reduced α,β-unsaturated ketones (enones) with 1,4-selectively even in the presence of aldehydes. Under anhydrous conditions, the successive aldol reaction between the resulting enolates and the remaining aldehydes proceeded with high anti-selectivity. The stereochemistry was dramatically reversed to be syn-selective by the use of water and methanol as an additive and solvent, respectively.
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