Reactions of 3-(Prop-2-enylidene)azetidin-2-ones with 4,5-Dihydro-3H-1,2,4-triazole-3,5-diones
作者:Sabine Ruf、Hans-Hartwig Otto
DOI:10.1002/hlca.19960790715
日期:1996.10.30
The 3-(2-propenylidene)-β-lactams 1a–c react as semicyclic dienes with the dihydrotriazole-diones 2 in a stereoselective fashion leading to the cycloadducts 3. The 3′,3′-disubstituted derivative 4 gives no [4 + 2]-cycloaddition products but forms the adducts 5 and 6. Sterochemistry and reaction pathways are discussed.