作者:Diego Armesto、Ana Ramos、Maria J. Ortiz、Maria J. Mancheño、Elena P. Mayoral
DOI:10.1002/recl.19951141116
日期:——
Previously, β, γ-unsaturatedoximes were thought to be photochemically unreactive. The present study reports the first three examples of photocyclization of β,γ-unsaturated ketoximes to yield 4,5-dihydroisoxazole derivatives. Typically, acetophenone-sensitized irradiation of 3,3-dimethyl-5,5-diphenylpent-4-en-2-one oxime (2) affords 5-(diphenylmethyl)-3,4,4-trimethyl-4,5-dihydroisoxazole (3) in 38%