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
A straightforward and efficient C(sp2)–H acylation of enamides with aldehydes via transition-metal-free photoredox catalysis is demonstrated. The transformation proceeded smoothly without resorting to expensive and potentially toxic iridium or ruthenium polypyridyl-based photocatalysts under mild conditions, furnishing a diverse range of synthetically crucial, geometrically defined β-acylated enamides
only: An atom‐economical synthetic route towards arylated Z‐enamides through double CH functionalization is described. The Z/E selectivity of the palladium‐catalyzed monoarylation is absolute (step A in scheme), and the molecular complexity of the products can be further endowed by a sequential second arylation, which requires the use of trifluoracetic acid (TFA; step B).
Photoredox-catalyzed regio- & stereoselective C(sp<sup>2</sup>)–H cyanoalkylation of enamides with cycloketone oximes <i>via</i> selective C–C bond cleavage/radical addition cascade
A photoredox-catalyzed regio- and stereoselective Heck-type cyanoalkylation of synthetically prominent enamides with cycloketone oximes via selective β-C–C bond scission/selective radicaladdition cascade is developed, enabling the incorporation of synthetically versatile and pharmaceutically appealing distal cyanoalkyl moieties into enamide scaffolds under mild conditions. The synthetic importance
Rhodium(III)-Catalyzed Switchable β-C(sp2)–H Alkenylation and Alkylation of Acyclic Enamides with Allyl Alcohols
作者:Xiaolan Li、Jie Liu、Ruixin Song、Xuzhong Luo、Haiqing Luo
DOI:10.1021/acs.orglett.4c01234
日期:2024.5.3
presented using readily accessible allylic alcohols by switching the reaction conditions. This tunable transformation has been applied to a wide range of substrates and typically proceeded with excellent regioselectivity and stereoselectivity as well as with good functional group tolerance. The catalytic system offers an efficient approach for synthesizing various functionalized enamides bearing N-(2Z,4E)-butadiene
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。