在此,通过切换反应条件,使用易于获得的烯丙醇,提出了铑(III)催化的β-C(sp 2 )–H烯基化和烯酰胺烷基化。这种可调谐的转化已应用于多种底物,并且通常具有优异的区域选择性和立体选择性以及良好的官能团耐受性。该催化系统提供了一种有效的方法来合成带有N- (2 Z ,4 E )-丁二烯和( Z )-β-C(sp 2 )–H烷基化烯酰胺的各种官能化烯酰胺。此外,机理实验表明,Rh(III) 催化的 C-H 活化与关键步骤无关。
Modular Monodentate Phosphoramidite Ligands for Rhodium-Catalyzed Enantioselective Hydrogenation
作者:Yan Liu、Kuiling Ding
DOI:10.1021/ja052749l
日期:2005.8.1
A new class of monodentate phosphoramidite ligands (DpenPhos) has been developed on the basis of the modular concept for Rh(I)-catalyzed asymmetric hydrogenations of a variety of olefin derivatives, affording the corresponding optically active compounds in excellent yields and enantioselectivities. The ligands have the advantages of facile preparation, tunable structure, and broad scope of substrates
Rhodium(III)-Catalyzed Direct C–H Arylation of Various Acyclic Enamides with Arylsilanes
作者:Xiaolan Li、Kai Sun、Wenjuan Shen、Yong Zhang、Ming-Zhu Lu、Xuzhong Luo、Haiqing Luo
DOI:10.1021/acs.orglett.0c03578
日期:2021.1.1
The stereoselective β-C(sp2)–H arylation of various acyclic enamides with arylsilanes via Rh(III)-catalyzed cross-coupling reaction was illustrated. The methodology was characterized by extraordinary efficacy and stereoselectivity, a wide scope of substrates, good functional group tolerance, and the adoption of environmentally friendly arylsilanes. The utility of this present method was evidenced by
Visible-light-promoted olefinic trifluoromethylation of enamides with CF<sub>3</sub>SO<sub>2</sub>Na
作者:Kai Tang、Yixuan Chen、Jianping Guan、Zhujun Wang、Kai Chen、Haoyue Xiang、Hua Yang
DOI:10.1039/d1ob01410b
日期:——
A visible-light-promoted olefinic C–H trifluoromethylation of enamides was developed by employing cheap and stable Langlois’ reagent as the CF3 source. A series of β-CF3 enamides were obtained in moderate to good yields with high E-isomer selectivity under mild conditions. Preliminary mechanistic studies suggest that molecular oxygen acts as the terminal oxidant for this net oxidative process, and
Tetrabutylammonium iodide-catalyzed oxidative coupling of enamides with sulfonylhydrazides: synthesis of β-keto-sulfones
作者:Yucai Tang、Ye Zhang、Kaifeng Wang、Xiaoqing Li、Xiangsheng Xu、Xiaohua Du
DOI:10.1039/c5ob00742a
日期:——
A facile syntheticroutetowards pharmaceutically interesting β-keto-sulfone derivatives by tetrabutylammonium iodide (TBAI)/tert-butyl hydroperoxide (TBHP) mediated oxidative coupling of readily prepared enamides with economical sulfonylhydrazides is described. The corresponding β-keto-sulfone compounds were obtained in moderate to good yields. The present method is metal-free and base-free and shows
A copper(II)-catalyzed oxidative reaction for the one-pot simultaneous synthesis of quinolines and gem-diamine derivatives from N-arylglycine ethyl esters and enamides is described. In this reaction, the two fragments in an enamide substrate react with the same intermediate generated in situ from an N-arylglycine ethyl ester, respectively, producing two products simultaneously. This reaction has the