Benzannulation of Triynes to Generate Functionalized Arenes by Spontaneous Incorporation of Nucleophiles
作者:Rajdip Karmakar、Sang Young Yun、Jiajia Chen、Yuanzhi Xia、Daesung Lee
DOI:10.1002/anie.201412468
日期:2015.5.26
The thermal reaction of ester‐tethered 1,3,8‐triynes provides novel benzannulation products with concomitant incorporation of a nucleophile. Evidence suggests that this reaction proceeds via an allene‐enyne intermediate generated by an Alder‐ene reaction in the first step. Depending on the substituent of the alkyne moiety on the allene‐enyne intermediate, the subsequent transformation can take one
酯束缚的1,3,8-三炔的热反应提供了新的苯并环氧基化产物,并伴随有亲核试剂的结合。有证据表明,该反应是通过第一步中的Alder-ene反应生成的Allene-Enyne中间体进行的。根据丙二烯-烯炔中间体上炔基部分的取代基,后续的转化可采用两种不同的途径之一,每种途径可导致不连续的芳构化产物。硅烷取代的1,3,8-三炔的苯并环形成芳烃产品,并在新形成的苯核上掺入了亲核试剂,而芳基取代基导致亲核试剂捕获在与芳基取代基相连的苄基碳原子上。