(3aR,7S,7aR)-2,2-Dimethyl-7-(toluene-4-sulfonyloxy)-3a,6,7,7a-tetrahydro-benzo[1,3]dioxole-5-carboxylic acid methyl ester 在
potassium superoxide 作用下,
生成
(3R,3aS,6aR)-5,5-Dimethyl-3-(toluene-4-sulfonyloxy)-tetrahydro-1,4,6-trioxa-cyclopropa[e]indene-1a-carboxylic acid methyl ester