arylacrylamides with dichloromethane or acetonitrile has been developed. The reactions described provide novel access to chloro- and cyano-containing oxindoles in good to moderate yields that allow the direct formation of a C–C bond and the construction of an oxindole ring in one reaction. The use of a cheap and easily prepared Mn(OAc)3 represents an added advantage of this method.
Radical cascade cyanomethylation of activated alkenes to construct cyano substituted oxindoles
作者:Juan Li、Zhigang Wang、Ningjie Wu、Ge Gao、Jingsong You
DOI:10.1039/c4cc07667b
日期:——
cyanomethyl radical was easily generated from acetonitrile by using DTBP, which was applied to a cascadealkene addition and cyclization reaction to construct useful oxindole derivatives. This protocol features simple manipulation, cheap reagents and a broad substrate scope. In addition, nitro substituted oxindoles were also synthesized for the first time.
Heterogeneous photocatalytic cyanomethylarylation of alkenes with acetonitrile: synthesis of diverse nitrogenous heterocyclic compounds
作者:Guanglong Pan、Qian Yang、Wentao Wang、Yurong Tang、Yunfei Cai
DOI:10.3762/bjoc.17.89
日期:——
photocatalytic cyanomethylarylation of alkenes with acetonitrile has been established using K-modified carbon nitride (CN-K) as a recyclable semiconductor photocatalyst. This protocol, employing readily accessible alkyl N-hydroxyphthalimide (NHPI) ester as a radical initiator, allows the efficient construction of a broad array of structural diverse nitrogenous heterocyclic compounds including indolines, oxindoles
使用 K 改性氮化碳(CN-K)作为可回收半导体光催化剂,建立了可见光介导的烯烃与乙腈的异相光催化氰甲基芳基化反应。该方案采用易于获得的烷基N-羟基邻苯二甲酰亚胺 (NHPI) 酯作为自由基引发剂,可以有效构建多种结构多样的含氮杂环化合物,包括二氢吲哚、羟吲哚、异喹啉酮和异喹啉二酮。
Visible-light induced tandem radical cyanomethylation and cyclization of N-aryl acrylamides: access to cyanomethylated oxindoles
A visible-light induced cyanomethylation of N-aryl acrylamides with bromoacetonitrile followed by intramolecular cyclization has been explored. This transformation exhibits a wide substrate scope and significant functional group tolerance, providing a facile synthetic approach and highly efficient access to cyanomethylated oxindoles.
Fe-promoted radical cyanomethylation/arylation of arylacrylamides to access oxindoles via cleavage of the sp<sup>3</sup> C–H of acetonitrile and the sp<sup>2</sup> C–H of the phenyl group
作者:Changduo Pan、Honglin Zhang、Chengjian Zhu
DOI:10.1039/c4ob02172j
日期:——
Radical cyanomethylation/arylation of arylacrylamides to access oxindoles with acetonitrile as the radical precursor is described. This reaction involves dualC–H bond functionalization, including the sp3 C–H of acetonitrile and the sp2 C–H of the phenyl group. A variety of functional groups, such as methoxy, ethyloxy carbonyl, chloro, bromo, iodo, nitro, trifluoromethoxy and trifluoromethyl groups