Cycloaddition of β-substituted enones to a bicyclic sydnone: Observation of an unexpectedly facile hydrocarbon elimination
作者:Scott D. Larsen、Esther Martinborough
DOI:10.1016/s0040-4039(01)80759-0
日期:1989.1
Cycloaddition of β-alkyl- or β-arylenones to bicyclic sydnone 3 in the absence of added oxidant affords mixtures of the tetrahydropyrazolo[1,5-a]pyridines 4 and 5. The amount of 5 formed was dependent on the nature of R.