Synthesis of 1,4-dicarbonyl compounds via the conjugate addition of a masked activated ester, ROCH(CN)2
摘要:
A new acyl anion equivalent for the preparation of masked activated esters, the protected hydroxymalonitrile 1, readily undergoes conjugate addition to alpha,beta-unsaturated carbonyl derivatives 2 to give the masked 1,4-dicarbonyl compounds 3 in good to high yields. 1,4-Dicarbonyl compounds 4, in which one of the two carbonyl groups has a reactivity different from the other, can be prepared selectively from 3.
A new acyl anion equivalent for the preparation of masked activated esters, the protected hydroxymalonitrile 1, readily undergoes conjugate addition to alpha,beta-unsaturated carbonyl derivatives 2 to give the masked 1,4-dicarbonyl compounds 3 in good to high yields. 1,4-Dicarbonyl compounds 4, in which one of the two carbonyl groups has a reactivity different from the other, can be prepared selectively from 3.