2-((4R,5S)-2,2-Dimethyl-5-vinyl-[1,3]dioxolan-4-ylmethyl)-malonic acid dimethyl ester 在
titanium(IV) tetrabutoxide 、
碘 、
copper(II) oxide 作用下,
以
二氯甲烷 为溶剂,
以60%的产率得到(3aS,3bR,6aS,7aR)-2,2-Dimethyl-6-oxo-tetrahydro-furo[3',4':3,4]cyclopenta[1,2-d][1,3]dioxole-6a-carboxylic acid methyl ester