Visible-Light-Induced Trifluoromethylation of Isonitrile-Substituted Indole Derivatives: Access to 1-(Trifluoromethyl)-4,9-dihydro-3<i>H</i>-pyrido[3,4-b]indole and<i>β</i>-Carboline Derivatives
作者:Jiaxin Liu、Longhai Li、Liuzhu Yu、Lisha Tang、Qin Chen、Min Shi
DOI:10.1002/adsc.201800568
日期:2018.8.6
visible‐light‐induced trifluoromethylation of isonitrile‐substituted indolederivatives has been developed from the reaction of isonitrile‐substituted indoles with Togni II reagent, affording 1‐(trifluoromethyl)‐4,9‐dihydro‐3H‐pyrido[3,4‐b]indoles in moderate to good yields. The further transformations to β‐carboline derivatives and a harmacine derivative have been performed, demonstrating the potential synthetic
indole alkaloids with novel skeletons and multiple chiral centers are described. Synthesis of these alkaloids was achieved by a simple one‐step reaction using strictosidine and 12‐aza‐strictosidine as the key intermediates. Strictosidines were prepared by coupling of secologanin with tryptamine and 7‐aza‐tryptamine, respectively, using the immobilized recombinant Rauvolfia strictosidinesynthase. A detailed