Iridium-catalyzed direct C–H amidation of anilines with sulfonyl azides: easy access to 1,2-diaminobenzenes
作者:Lianhui Wang、Zi Yang、Mengqi Yang、Rongyi Zhang、Changsheng Kuai、Xiuling Cui
DOI:10.1039/c7ob01899a
日期:——
An Ir(III)-catalyzed regioselective C–H amidation of anilines with sulfonyl azides is described. The developed protocol has good compatibility with diverse functional groups, efficiently providing the monoamidated products with good to excellent yields under mild reaction conditions. Furthermore, the 2-pyrimidyl and sulfonyl moieties in the amidated products can readily be removed, offering the synthetically
Multiple Roles of the Pyrimidyl Group in the Rhodium‐Catalyzed Regioselective Synthesis and Functionalization of Indole‐3‐carboxylic Acid Esters
作者:Hui Jiang、Shang Gao、Jinyi Xu、Xiaoming Wu、Aijun Lin、Hequan Yao
DOI:10.1002/adsc.201500769
日期:2016.1.21
A regioselective synthesis of indole‐3‐carboxylic acid esters from anilines and diazo compounds has been realized by making use of the pyrimidyl group‐assisted rhodium‐catalyzed CH activation and CNbond formation. The reaction proceeds under mild conditions, exhibits good functional group tolerance and scalability. Reutilization of the pyrimidyl directing group in the resulting products provided
Efficient Ru-catalyzed regioselective C–H oxygenation of N-aryl-2-pyrimidines is described with aryl carboxylic acids in the presence of AgSbF6 as an additive and Ag2CO3 as an oxidant. The reaction can be extended to alkyl, heteroaryl, and α,β-unsaturated carboxylic acids. The regioselectivity, broad substrate scope, and functional group tolerance are the significant practical advantages.
描述了在AgSbF 6作为添加剂和Ag 2 CO 3作为氧化剂的情况下,使用芳基羧酸对N-芳基-2-嘧啶进行Ru催化的区域选择性C–H氧化。该反应可以扩展至烷基,杂芳基和α,β-不饱和羧酸。区域选择性,广泛的底物范围和官能团耐受性是显着的实际优势。
Hypervalent Iodine(III) Promoted Direct Synthesis of Imidazo[1,2-<i>a</i>]pyrimidines
An efficient and mild synthesis of imidazo[1,2-a]pyrimidine derivatives has been developed from readily available pyrimidyl arylamines or enamines through a hypervalent iodine-promoted intramolecular C–H bond cycloamination reaction. This protocol allows for the facile construction of biologically active bicyclic imidazo[1,2-a]pyrimidine skeletons as well as other imidazo[1,2-a]-type fused heterocycles
The amination of 2-chloropyrimidines was performed with several aniline derivatives in the presence of tolylzinc bromide as a base. The organozinc compound has a profound effect on the reactivity of the amines, so that the reaction takes place at room temperature. Further studies gave insight into the reaction mechanism and favor a nucleophilic substitution over a catalytic process.