Ketene-diene [4 + 2] cycloaddition products via cation radical initiated Diels-Alder reaction or vinylcyclobutanone rearrangement
作者:Michael Schmittel、Heinke Von Seggern
DOI:10.1021/ja00059a010
日期:1993.3
thermal reaction of the aryl methyl ketenes 1a and 1b with 2 resulted, as anticipated, in the periselective formation of the vinylcyclobutanones 3-6, the aminium ion salt initiated cycloaddition afforded selectively the Diels-Alder products 10 and 11. The potential role of BrOnsted and Lewis acids, the suitability of different one-electron oxidants, and the effect of reactant concentration, reaction time