Experimental and Theoretical Studies on Rhodium-Catalyzed Coupling of Benzamides with 2,2-Difluorovinyl Tosylate: Diverse Synthesis of Fluorinated Heterocycles
Fluorinated heterocycles play an important role in pharmaceutical and agrochemical industries. Herein, we report on the synthesis of four types of fluorinated heterocycles via rhodium(III)-catalyzed C-H activation of arenes/alkenes and versatile coupling with 2,2-difluorovinyl tosylate. With N-OMe benzamide being a directing group (DG), the reaction delivered a monofluorinated alkene with the retention
Mild Rhodium(III)-Catalyzed C–H Allylation with 4-Vinyl-1,3-dioxolan-2-ones: Direct and Stereoselective Synthesis of (<i>E</i>)-Allylic Alcohols
作者:Shang-Shi Zhang、Jia-Qiang Wu、Ye-Xing Lao、Xu-Ge Liu、Yao Liu、Wen-Xin Lv、Dong-Hang Tan、Yao-Fu Zeng、Honggen Wang
DOI:10.1021/ol503229c
日期:2014.12.19
A rhodium(III)-catalyzed C–H direct allylation reaction with 4-vinyl-1,3-dioxolan-2-ones has been developed. The reaction provides a facile and stereoselective access to substituted-(E)-allylic alcohols under mild and redox-neutral reaction conditions. Olefinic C–H activation is applicable, giving multifunctionalized skipped dienes in good yields. Minimal double-bond migration was observed.
Tandem Catalysis: Rh(III)-Catalyzed C–H Allylation/Pd(II)-Catalyzed <i>N</i>-Allylation Toward the Synthesis of Vinyl-Substituted <i>N</i>-Heterocycles
作者:Shang-Shi Zhang、Jia-Qiang Wu、Xuge Liu、Honggen Wang
DOI:10.1021/cs501601c
日期:2015.1.2
Tandemcatalysis by Rh(III)/Pd(II) was realized, enabling rapid access to two important N-heterocycles that bear a synthetically valuable vinyl substituent. The reaction occurred under mild reaction conditions and was easy to handle. Good substrate scope and high regio- and stereoselectivities were observed. The vinyl group was demonstrated to be a reliable handle for functional group interconversions