Direct photo-induced reductive Heck cyclization of indoles for the efficient preparation of polycyclic indolinyl compounds
作者:Daohong Yu、Wai-Pong To、Yungen Liu、Liang-Liang Wu、Tingjie You、Jesse Ling、Chi-Ming Che
DOI:10.1039/d1sc04258k
日期:——
The indole compounds examined display room-temperature phosphorescence. The photochemical reaction tolerates a panel of functional groups including esters, alcohols, amides, cyano and alkenes (27 examples, 50–88% yields), and can be used to prepare polycyclic compounds and perform the functionalization of natural product analogues in moderate to good yields. Mechanistic experiments, including time-resolved
C(sp 2 )–Cl 键的光诱导断裂是有机合成中一种颇具吸引力的合成工具,但通常需要使用强紫外光、光催化剂和/或光敏剂。本文描述了使用 UVA/蓝色 LED 的直接光诱导氯芳烃活化,其可用于吲哚的还原赫克环化,并且无需使用光催化剂或光敏剂。所检测的吲哚化合物显示室温磷光。该光化学反应可耐受一系列官能团,包括酯、醇、酰胺、氰基和烯烃(27 个实例,产率 50-88%),可用于制备多环化合物并以中等至良好的速度进行天然产物类似物的官能化。产量。包括时间分辨吸收光谱在内的机理实验支持吲哚底物和 DIPEA 之间的光诱导电子转移,并在光诱导脱芳构化反应中形成自由基中间体。