Metal-Free Synthesis of Indolopyrans and 2,3-Dihydrofurans Based on Tandem Oxidative Cycloaddition
作者:Subin Choi、Hyeonji Oh、Jeongwoo Sim、Eunsoo Yu、Seunghoon Shin、Cheol-Min Park
DOI:10.1021/acs.orglett.0c01896
日期:2020.7.17
transfer between coupling partners followed by cage collapse allows highly selective cross-coupling while employing only equimolar amounts of coupling partners. Moreover, the mechanistic manifold was expanded for the functionalization of enamines to give the stereoselective synthesis of 2,3-dihydrofurans. This iodine-mediatedoxidative coupling features mild conditions and fast reaction kinetics.
Direct Functionalization of Indoles: Copper-Catalyzed Malonyl Carbenoid Insertions
作者:Michael B. Johansen、Michael A. Kerr
DOI:10.1021/ol1020948
日期:2010.11.5
Indoles, when treated with dimethyl diazomalonate under catalysis by Cu(acac)(2), undergo C-H insertion reactions regioselectively depending on the substitution pattern on the indole moiety. Indoles where the 3-position is substituted give high yields of the C2-H insertion product. Microwave conditions are also disclosed which show comparable yields with reduced reaction times.