Radical-Mediated Strategies for the Functionalization of Alkenes with Diazo Compounds
作者:Yong-Liang Su、Geng-Xin Liu、Jun-Wen Liu、Linh Tram、Huang Qiu、Michael P. Doyle
DOI:10.1021/jacs.0c05183
日期:2020.8.12
reported. Here we report a novel reaction of diazo compounds utilizing a radical-mediated addition strategy to achieve difunctionalization of diverse alkenes. Diazo compounds are transformed to carbon radicals with a photocatalyst or an iron catalyst through PCET processes. The carbon radical selectively adds to diverse alkenes delivering new carbon radical species, then forms products through hydroalkylation
In situ generation of nitrilium from nitrile ylide and the subsequent Mumm rearrangement: copper-catalyzed synthesis of unsymmetrical diacylglycine esters
作者:Jijun Chen、Ying Shao、Liang Ma、Meihua Ma、Xiaobing Wan
DOI:10.1039/c6ob02037b
日期:——
A novel in situ generation of nitrilium from a nitrileylide and the subsequent Mumm rearrangement of carboxylic acid, nitrile, and diazo compounds gave various unsymmetrical diacylglycine esters in moderate to high yields. This copper-catalyzed cascade reaction enables one-pot generation of two C–N bonds, one CO bond, and one C–H bond, with nitrogen as the only byproduct. The reaction has a broad
Nickel-Catalyzed Transformation of Diazoacetates to Alkyl Radicals Using Alcohol as a Hydrogen Source
作者:Jingjing Zhao、Pan Li、Yaohua Xu、Yixin Shi、Fuwei Li
DOI:10.1021/acs.orglett.9b03610
日期:2019.12.6
transformation of diazoacetates to α-carbonyl methylene radicals has been disclosed in the presence of hyperoxide using ethanol as a hydrogen source and solvent. This strategy is successfully applied in the formation of indolin-2-ones or 1,4-dicarbonyl compounds from acrylamides or enamides in moderate to good yields. These reactions undergo radical addition onto C-C double bonds followed by a cyclization/oxidation
Cu-based carbene involved in a radical process: a new crossover reaction to construct γ-peroxy esters and 1,4-dicarbonyl compounds
作者:Jiewen Jiang、Jiajun Liu、Ling Yang、Ying Shao、Jiang Cheng、Xiaoguang Bao、Xiaobing Wan
DOI:10.1039/c5cc05183e
日期:——
Herein, a novel crossover reaction of Cu-based carbene, olefin, and tert-butyl hydroperoxide (TBHP) was well developed, leading to γ-peroxy esters and 1,4-dicarbonyl compounds.
Two Distinct Ag(I)- and Au(I)-Catalyzed Olefinations between α-Diazo Esters and <i>N</i>-Boc-Derived Imines
作者:Rahul Dadabhau Kardile、Rai-Shung Liu
DOI:10.1021/acs.orglett.9b02343
日期:2019.8.16
Metal-catalyzed reactions between α-diazo esters and imines were well-known to yield aziridine derivatives exclusively. This work reports two newolefinationreactions between N-Boc-derived (Boc = tert-Butyloxycarbonyl) imines and α-diazo esters with Ag(I) and Au(I) catalysts, respectively. Our mechanistic studies reveal that these newolefinations involve an initial attack of diazo esters on metal/imine