作者:Dong-Dong Wu、Ming-Tao He、Qi-Di Liu、Wei Wang、Jie Zhou、Lei Wang、Hoong-Kun Fun、Jian-Hua Xu、Yan Zhang
DOI:10.1039/c2ob07158d
日期:——
Photoinduced reactions of isatin and N-methyl-1,3,4-isoquinolinetrione with bicycloalkylidenes such as bicyclopropylidene, cyclopropylidenecyclobutane, cyclopropylidenecyclohexane and bicyclohexylidene were investigated. The reactions gave spirooxetanes as the major products derived from the [2 + 2] photocycloaddition pathway via 1,4-biradical recombination. Unusual products including the [4 + 2 + 2] cycloadducts, the oxoisochroman derivatives and other ring-rearranged products were derived from competitive pathways via 1,6-biradical recombination. The presence of oxygen in the reaction solution was found to be relevant to the distribution of different types of products. Mechanisms were proposed to rationalize the chemo- and regioselectivity in the photoreactions and the origin of the different types of products.
研究了靛红和 N-甲基-1,3,4-异喹啉三酮与双环亚烷基(如双环亚丙基、环亚丙基癸基环丁烷、环亚丙基癸基环己烷和双环亚己基)的光诱导反应。这些反应的主要产物是通过 1,4-双环重组的[2 + 2]光环加成途径产生的螺环氧乙烷。包括[4 + 2 + 2]环加成产物、氧代异色曼衍生物和其他环状重组产物在内的不常见产物是通过 1,6-双环重组的竞争性途径得到的。研究发现,反应溶液中氧的存在与不同类型产物的分布有关。还提出了一些机制,以合理解释光反应中的化学和区域选择性以及不同类型产物的来源。