Cu-Catalyzed carbamoylation<i>versus</i>amination of quinoline<i>N</i>-oxide with formamides
作者:Yan Zhang、Shiwei Zhang、Guangxing Xu、Min Li、Chunlei Tang、Weizheng Fan
DOI:10.1039/c8ob02844c
日期:——
An efficient, direct carbamoylation and amination of quinoline N-oxides with formamides to access 2-carbamoyl and 2-amino quinolines has been developed throughcopper-catalyzed C–C and C–N bond formations via cross-dehydrogenative coupling reactions. The reaction proceeds smoothly over a broad range of substrates with excellent functional group tolerance under mild conditions. Mechanistic studies suggest
Oxidative coupling of alkenes with amides using peroxides: selective amide C(sp<sup>3</sup>)–H versus C(sp<sup>2</sup>)–H functionalization
作者:Xu-Heng Yang、Wen-Ting Wei、Hai-Bing Li、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/c4cc05051g
日期:——
described, in which mono- and difunctionalization of alkenes are selectively achieved. In this reaction with amides, the chemoselectivity toward the functionalization of the C(sp(3))-Hbonds adjacent to the nitrogen atom or the functionalization of the carbonyl C(sp(2))-Hbonds across alkenes relies on the reaction conditions.
Copper-catalyzed sp3-carbon radical/carbamoyl radical cross coupling: A direct strategy for carbamoylation of 1,3-dicarbonyl compounds
作者:Xu-Ping Yan、Cheng-Kun Li、Shao-Fang Zhou、Adedamola Shoberu、Jian-Ping Zou
DOI:10.1016/j.tet.2020.131342
日期:2020.7
radical cross-coupling protocol for the construction of C(sp3)-C(O) bond is described. This provides a straightforward method for synthesis of 2-carbamoyl-1,3-dicarbonyl compounds in good to excellent yields under mild conditions. Mechanistic studies confirms the generation of both carbamoyl and C(sp3)-centered radicals directly fromoxidation of C(sp3)-H bond of formamides and 1,3-dicarbonyl compounds, respectively
Heck reaction catalysed by palladium supported with an electron-rich benzimidazolylidene generated in situ: remarkable ligand electronic effects and controllable mono- and di-arylation
作者:Gang Zou、Wen Huang、Yuanjing Xiao、Jie Tang
DOI:10.1039/b601833e
日期:——
The Heckreactions of arylbromides and chlorides are efficiently catalysed by palladium supported with benzimidazolylidenes generated in situ from N,N-dialkylbenzimidazolium salts in molten tetrabutylammonium bromide (TBAB) as ionic liquid reaction medium. Remarkable electronic effects from the benzimidazoliums on the catalysis have been observed. Reaction of 4-chloroacetophone with butyl acrylate
Visible-Light-Enabled Oxidative Coupling of Alkenes with Dialkylformamides To Access Unsaturated Amides
作者:Maojian Lu、Zhaowei Lin、Shanyi Chen、Hongyou Chen、Mingqiang Huang、Shunyou Cai
DOI:10.1021/acs.orglett.9b03870
日期:2019.12.20
A practical and direct method for oxidative cross-coupling of alkenes with dialkylformamides is established employing visible-light-enabled photoredox catalysis. This strategy allows efficient access to diverse unsaturated amides under mild reaction conditions. The application of an appropriate diaryliodonium salt was demonstrated to be critical to the success of this process. This catalyst system