Regioselective Single and Double Conjugate Additions to Substituted Cyclohexa-2,5-dienone Monoacetals
作者:Scott Grecian、Aaron D. Wrobleski、Jeffrey Aubé
DOI:10.1021/ol050715c
日期:2005.7.1
[reaction: see text]. A series of quinone monoacetals bearing electron-withdrawing groups was treated with diethyl malonate and other bifunctional nucleophiles in the presence of KO-t-Bu in THF. Reactions of ethyl 3-nitropropionate or diethyl malonate resulted in single conjugate addition adducts. When ethylacetoacetate was used as a nucleophile, bridged bicyclic products were obtained in good yields