catalysis is an efficient process for the alkylation of diverse organic compounds via the generation of alkyl radicals from alkyl bromides and iodides. However, the generation of alkyl radicals from more stable alkyl chlorides remains challenging. Herein, we demonstrate the excited-state palladium-catalyzed synthesis of oxindoles and isoquinolinediones via alkylation/annulation reaction by overcoming
Cascade radical cyclization of N-arylacrylamides is an attractive method to prepare 3,3-disubstituted oxindoles. As the reported methods often require additives and/or photocatalysts, we herein report an additive- and photocatalyst-free deaminative strategy for their synthesis under mild conditions, enabled by photoactivation of an electrondonor–acceptor (EDA) complex. DFT studies indicated that the
A metal-free synthesis of oxindoles by a radical addition-cyclization onto N-arylacrylamides with xanthates
作者:Shucheng Wang、Xuhu Huang、Bowen Li、Zemei Ge、Xin Wang、Runtao Li
DOI:10.1016/j.tet.2015.01.049
日期:2015.3
A convenient, high yielding synthesis of oxindoles by metal-free di-functionalization of alkenes with xanthates has been developed. This transformation involves a radical addition/cyclization process. Various arylalkylation products including alkyl ester-, benzyl-, cyano-, ketone-, amine-, and amide-substituted oxindoles were prepared in good to excellent yields. (C) 2015 Elsevier Ltd. All rights reserved.