Regioselective Radical Borylation of α,β-Unsaturated Esters and Related Compounds by Visible Light Irradiation with an Organic Photocatalyst
作者:Guosong Li、Guanwang Huang、Ruixia Sun、Dennis P. Curran、Wen Dai
DOI:10.1021/acs.orglett.1c01270
日期:2021.6.4
recently been reported and are still rare. Here we describe a photoredox radical hydroboration of α,β-unsaturatedesters, amides, ketones, and nitriles with NHC-boranes that uses only an organocatalyst and visible light. The conditions are mild, the substrate scope is broad, and the α/β regioselectivity is high. The reaction requires only the organocatalyst; there is no costly metal, and there are no
Insertion of Reactive Rhodium Carbenes into Boron–Hydrogen Bonds of Stable N-Heterocyclic Carbene Boranes
作者:Xiben Li、Dennis P. Curran
DOI:10.1021/ja4056245
日期:2013.8.14
available rhodium(II) salts catalyze reactions between NHC-boranes (NHC-BH3) and diazocarbonyl compounds (N2CRCOR'). Stable α-NHC-boryl carbonyl compounds (NHC-BH2-CHRCOR') are isolated in good yields. The reaction is a reliable way to make boron-carbon bonds with good tolerance for variation in both the NHC-borane and diazocarbonyl components. It presumably occurs by insertion of a transient rhodium carbene