first Pd-catalyzed C–H ethoxycarbonyldifluoromethylation with BrCF2CO2Et has been developed. The use of a bidentate phosphine ligand (Xantphos) is critical for the reaction to occur. A variety of electron-richheteroarenes, including indoles, furans, thiophenes, and pyrroles, can be ethoxycarbonyldifluoromethylated in moderate to excellent yields. The reactions take place at the C–H bonds adjacent to
已经开发出了第一个由BrCF 2 CO 2 Et催化的Pd催化的C–H乙氧基羰基二氟甲基化反应。双齿膦配体(Xantphos)的使用对于反应的发生至关重要。各种电子富集的杂芳烃,包括吲哚,呋喃,噻吩和吡咯,都可以以中等至极好的收率被乙氧基羰基二氟甲基化。反应发生在杂原子附近的CH键上,具有很高的区域选择性。该方法为将二氟烷基引入富电子杂芳烃提供了新的协议。
Visible-Light-Induced C–F Bond Activation for the Difluoroalkylation of Indoles
作者:Scott T. Shreiber、Albert Granados、Bianca Matsuo、Jadab Majhi、Mark W. Campbell、Shivani Patel、Gary A. Molander
DOI:10.1021/acs.orglett.2c03549
日期:2022.11.25
An aryl disulfide mediated C–Fbondactivation of the trifluoromethyl group to generate valuable gem-difluoroalkylindoles is described. This method relies on readily available commodity reagents under mild reaction conditions and represents the first transition-metal-free redox-neutral C–Fbondactivation strategy. The reaction employs various substituted indoles and α-fluoro-substituted esters. Further
Direct Fluoroalkylation of Indoles with Fluoroalkyl Halides Mediated by Copper
作者:Ru-Yi He、Hui-Ting Zeng、Jing-Mei Huang
DOI:10.1002/ejoc.201402526
日期:2014.7
An efficient and mild copper-mediated reaction for the direct perfluoroalkylation and difluoromethylation of indoles with perfluoroalkyl halides and ICF2COOEt to produce 2-substituted indoles was developed. Both free indole derivatives and N-substituted indole derivatives could be used in this process to obtain the desired products in moderate to good yields.