Rh(<scp>iii</scp>)-Catalyzed dual C–H functionalization of 3-(1<i>H</i>-indol-3-yl)-3-oxopropanenitriles with sulfoxonium ylides or diazo compounds toward polysubstituted carbazoles
A rhodium-catalyzed annulation of 3-(1H-indol-3-yl)-3-oxopropanenitriles with sulfoxonium ylides or diazo compounds has been developed, leading to a series of polysubstituted carbazoles in moderate to good yields. This procedure proceeded with formal Rh(III)-catalyzed (4 + 2) cycloaddition, with the functionalization of 2-C–H bonds of indole in a step-economical procedure. Additionally, this reaction
Iridium-catalyzed boron-hydrogen bond insertionreactions of trimethylamine-borane and sulfoxoniumylides have been demonstrated, furnishing α-boryl ketones in moderate to excellent yields in most cases (51 examples; up to 84%). This practical and scalable insertionreaction showed broad substrate scope, high functional-group compatibility and could be applied in late-stage modification of structurally
The first iridium-catalyzed three-component coupling reaction of carbondioxide, amines, and sulfoxonium ylides has been developed, providing an efficient and straightforward method for the construction of a range of structurally diverse O-β-oxoalkyl carbamates in moderate to excellent yields. This novel protocol features the use of readily available substrates, wide substrate scope, and good functional
Rh(III)-catalyzed [4 + 1]-annulation of azobenzenes with α- carbonyl sulfoxonium ylides toward 3-acyl-(2H)-indazoles
作者:Jiawei Zhu、Song Sun、Jiang Cheng
DOI:10.1016/j.tetlet.2018.05.001
日期:2018.6
A Rh(III)-catalyzed [4 + 1]-annulation of azobenzenes with α- carbonylsulfoxoniumylides was developed to access 2H-indazoles in moderate to excellent yields with good functional group compatibilities. It proceeded with the sequential insertion of the Rh(III) carbene to the C−H bond and cyclization steps, where sulfoxoniumylides served as efficient and stable carbene precursor.