Leaving Group Assisted Strategy for Photoinduced Fluoroalkylations Using <i>N</i>
-Hydroxybenzimidoyl Chloride Esters
作者:Weigang Zhang、Zhenlei Zou、Yuanheng Wang、Yi Wang、Yong Liang、Zhengguang Wu、Youxuan Zheng、Yi Pan
DOI:10.1002/anie.201812192
日期:2019.1.8
(RAEs) as alkylradical precursors have been extensively developed for C−C bond formations. However, the analogous transformations of fluoroalkyl radicalsfrom the corresponding acid or ester precursors remain challenging because of the high oxidation potential of the fluoroalkyl carboxylate anions. The newly developed N‐hydroxybenzimidoylchloride (NHBC) ester provides a general leavinggroup assisted
N-acylpyrroles were synthesized via olefin ring-closingmetathesis of diallylamines and in situ oxidative aromatization in the presence of the ruthenium Grubbs catalyst and a suitable copper catalyst. In the presence of Cu(OTf)2 and CuBr2, the reaction afforded N-sulfonyl- and N-acylpyrroles, respectively, in one pot. Under an oxygen atmosphere, the reaction went smoothly without the need of hydroperoxide