Preparation of Protected β-Keto Aldehydes from β-Keto Esters via Selective Reduction of Acyl(alkoxycarbonyl)ketene Dithioacetals

Abstract
The acyl(alkoxycarbonyl)ketene dithioacetals 2 prepared from the corresponding ß-keto esters 1 in almost quantitative yield are reduced selectively with magnesium in methanol and subsequently dealkoxycarbonylated to give protected ß-keto aldehydes 4 high yields.

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