A catalyst-free and additive-free method for the synthesis of benzothiazolethiones from <i>o</i>-iodoanilines, DMSO and potassium sulfide
作者:Xiaoming Zhu、Wenguang Li、Xiai Luo、Guobo Deng、Yun Liang、Jianbing Liu
DOI:10.1039/c8gc00477c
日期:——
Under catalyst-free and additive-free conditions, a novel, convenient, environment-friendly method for the synthesis of benzothiazolethiones from o-iodoanilines, K2S and DMSO has been developed.
Cycloisomerization of Carbamoyl Chlorides in Hexafluoroisopropanol: Stereoselective Synthesis of Chlorinated Methylene Oxindoles and Quinolinones
作者:José F. Rodríguez、Anji Zhang、Jonathan Bajohr、Andrew Whyte、Bijan Mirabi、Mark Lautens
DOI:10.1002/anie.202103323
日期:2021.8.16
chloroacylation of alkyne-tethered carbamoyl chlorides. This reaction avoids the use of a metal catalyst and accesses products in high yields and stereoselectivities. Additionally, this reaction is scalable and proved amenable to a series of product derivatizations, including the synthesis of nintedanib. The reactivity of alkene-tethered carbamoyl chlorides with hexafluoroisopropanol (HFIP) was harnessed
because of their various pharmaceutical activities, though their synthetic methods had been limited. In some cases, toxic reagents, such as phosgene or carbon monoxide, are required. It was found that a silver catalyst successfully promoted the incorporation of CO2 into o-alkynylanilines to afford the corresponding benzoxazine-2-ones bearing Z exo-olefin via 6-exo-dig cyclization at the activated C–C triple
Copper-Catalyzed Intramolecular Oxidative C(sp<sup>3</sup>)-H Amidation of 2-Aminoacetophenones: Efficient Synthesis of Indoline-2,3-diones
作者:Jinbo Huang、Tingting Mao、Qiang Zhu
DOI:10.1002/ejoc.201400012
日期:2014.5
An efficient synthesis of diverse indoline-2,3-diones from 2-aminoacetophenones through copper-catalyzedintramolecular C(sp3)–H amidation is developed. The reaction proceeds in DMSO by using O2 as the sole oxidant to provide the desired products in moderate to good yields.
Synthesis of indolo- and pyrrolo[1,2-<i>a</i>]quinoxalinones through a palladium-catalyzed oxidative carbonylation of the <i>C</i><sub>2</sub> position of indole
作者:Attoor Chandrasekhar、Sethuraman Sankararaman
DOI:10.1039/c9ob02703c
日期:——
Cu(OAc)2 as an oxidant in toluene at 80 °C forms the corresponding quinoxalinones as exclusive products in good yields. The catalytically active C-H activated intermediate Pd complex was isolated and characterized for the first time which on exposure to CO gas in toluene at 80 °C gave the corresponding quinoxalinone derivative. On the basis of isolation of the intermediate, a possible mechanism has been proposed