The Pd‐catalyzed direct arylation of 2,1‐benzisoxazole with arylbromides to access 3‐arylbenzoisoxazoles proceeds in moderate‐to‐high yields with 1 mol % Pd(OAc)2 or 2 mol % PdCl(C3H5)(dppb) (dppb=1,4‐bis(diphenylphosphino)butane) as the catalysts and KOAc as an inexpensive base. A wide variety of (hetero)arylbromides have been employed successfully. Moreover, arylations followed by benzisoxazole
Pd催化2,1-苯并恶唑与芳基溴的直接芳基化反应以生成3-芳基苯并异恶唑,其产率为中至高,产率为1 mol%Pd(OAc)2或2 mol%PdCl(C 3 H 5)(dppb )(dppb = 1,4-双(二苯基膦基)丁烷)作为催化剂,KOAc作为便宜的碱。已经成功地使用了各种各样的(杂)芳基溴化物。此外,芳基化反应后再开苯并异恶唑开环,仅需两个步骤即可制备2-氨基二苯甲酮。
Metal‐Free Synthesis of Anthranils by PhIO Mediated Heterocyclization of
<i>ortho</i>
‐Carbonyl Anilines
作者:Alankrita Garia、Jatin Grover、Nidhi Jain
DOI:10.1002/ejoc.202100756
日期:2021.8.6
A metal-free synthesis of anthranils from ortho-carbonyl anilines using PhIO as a sole reagent under ambient conditions is described. No external additives are required, the reaction has broad substrate scope and delivers anthranils in excellent yields via oxidative heterocyclization.
Cobalt(III)-catalyzed electrophilic amination of inert C(sp3)–H bonds of weakly coordinating thioamides with readily accessible anthranil derivatives was accomplished under mild conditions, with good functional group tolerance, thus providing various amino aldehydes and amino ketones. Moreover, our protocol with the versatile [Cp*Co(MeCN)3][SbF6]2 features excellent atom-economy and oxidant-free conditions
Metal-Free, Visible-Light-Enabled Direct C3–H Arylation of Anthranils
作者:Tapas Adak、Chao Hu、Matthias Rudolph、Jun Li、A. Stephen K. Hashmi
DOI:10.1021/acs.orglett.0c01999
日期:2020.7.17
disodium salt-catalyzed photoredox C–H arylation of anthranils is reported. A variety of aryl diazonium tetrafluoroborates were used as aryl sources, providing the C3 cross-coupled products. The in situ generated reactive radicals were trapped by anthranils, providing an alternative method to transition-metal-catalyzed C–H arylations of anthranils. Gold-catalyzed downstream transformations demonstrate