A strategy for the preparation of cyclic polyarenes based on single electron transfer-promoted photocyclization reactions
作者:Hea Jung Park、Jung Hei Choi、Byeol Na Park、Ung Chan Yoon、Dae Won Cho、Patrick S. Mariano
DOI:10.1007/s11164-011-0422-8
日期:2012.3
Single electron transfer (SET)-promoted photocyclization reactions of substrates comprised of benzylsilane tethered to phthalimides were subjected to an exploratory study in order to probe a new approach for the preparation of cyclic polyarenes. The results show that UV irradiation of the substrates leads to efficient photochemical reactions that are initiated by SET from benzylsilane moieties to the excited phthalimide acceptor. Ensuing desilylation reactions of the benzylsilane cation radical moieties in the intermediate zwitterionic biradicals and proton transfer gives biradical precursors of the cyclic polyarene products. The observations made in this effort suggests that SET photochemical methods, which have been employed earlier to generate cyclic poly-ethers, -thioethers and -amides, serve as a useful method to access potentially interesting macrocyclic targets.
单电子转移(SET)促进的光环化反应,涉及苄基硅烷与呋喃酮连接的底物,进行了探索性研究,以探讨一种制备环状聚芳烃的新方法。结果表明,底物的紫外线辐照导致了有效的光化学反应,这些反应由苄基硅烷部分向激发态呋喃酮受体的SET引发。随后的苄基硅烷阳离子自由基部分在中间的两性离子双自由基中发生脱硅反应,并进行质子转移,最终形成环状聚芳烃产物的双自由基前体。这次研究中的观察表明,SET光化学方法(早期用于生成环状聚醚、聚硫醚和聚酰胺)是获取潜在有趣的宏环靶标的一种有效方法。