Intramolecular Diels−Alder Reactions of Cyclopropenone Ketals
作者:Paresma R. Patel、Dale L. Boger
DOI:10.1021/ol101375a
日期:2010.8.6
The first intramolecular cycloaddition reactions of cyclopropenone ketals with tethered electron-deficient, electron-rich, and neutral 1-substituted dienes are reported, constituting inverseelectrondemand, normal, and neutral Diels−Alder reactions, that provide exclusively the exo [4 + 2] cycloaddition products without the intervention of [1 + 2], [3 + 2], or [3 + 4] cycloadducts in reactions whose