Functionalized cyclopentane derivatives were prepared by the retro-ozonolys of methyl 2, 6- dioxoheptanoates, which are readily accessible from the photocycloaddition of methyl 2, 4- dioxopentanoate with olefins. By this method, 3-isopropenyl-2-methoxycarbonyl-1- methylcyclopentene, a versatile intermediate to iridoid terpenoids, and 1-methoxycarbonyl- 2, 6, 6-trimethylfulvene were synthesized from isoprene. Alternative syntheses of dl- ...
