2,4-二氧代戊酸甲酯与环(端)烯的[2+2]光环加成反应

The [2+2] Photocycloaddition of Methyl 2,4-Dioxopentanoate with Cyclic(Terminal) Olefin

选择2,4-二氧代戊酸甲酯与4,5-二甲基环己烯、甲叉基环己烯或者甲叉基环己烷进行了[2+2]环加成反应.通过控制反应条件,环加成产物可以选择性重排成多羰基化合物.同时,对化合物的形成过程进行了探讨,并且提出了可能的反应机理.所得新化合物的化学结构均经IR,1HNMR及元素分析予以确定.

The [2＋2] photocycloaddition reaction of methyl 2,4-dioxopentanoate with cyclohexene or methylene cyclohexene are carried out to give the photocycloadducts including some relevant by-products. The selective rearrangement of cycloadducts can take place by controlling reactive condition. The producing processes for the compounds are discussed and the reaction mechanisms are tentatively proposed. The structures of all new compounds are assigned based on the data from IR,1H NMR and elementalanalysis.