Diels-Alder Reactions of 1-Aza-1,3-butadienes: Room Temperature, Endo-Selective LUMOdiene-Controlled Cycloaddition Reactions of N-Sulfonyl-4-(ethoxycarbonyl)-1-aza-1,3-butadiene

Article abstract of DOI:10.1021/jo00307a009

The room temperature, endo-selective LUMO_diene-controlled Diels-Alder reactions of N-(phenylsulfonyl)- and N-(methylsulfonyl)-4-(ethoxycarbonyl)-1-aza-1,3-butadiene (3-4) are described, and the results represent a demonstration of the <4+2> cyc