Carbopalladation of Nitriles: Synthesis of Benzocyclic Ketones and Cyclopentenones via Pd-Catalyzed Cyclization of ω-(2-Iodoaryl)alkanenitriles and Related Compounds
作者:Alexandre A. Pletnev、Richard C. Larock
DOI:10.1021/jo0262006
日期:2002.12.1
An efficient procedure for the synthesis of 2,2-disubstituted benzocyclic ketones by intramolecular carbopalladation of nitriles has been developed. The cyclization of substituted 3-(2-iodoaryl)propanenitriles affords indanones in high yields. The reaction is compatible with a wide variety of functional groups. This methodology has been extended to the synthesis of tetralones and cyclopentenones.
nickel-catalyzed cyanation of phenol derivatives with metal-free cyanating agents, aminoacetonitriles, is described. A nickel-based catalytic system consisting of a unique diphosphine ligand such as dcype or dcypt enables the cyanation of versatile phenol derivatives such as aryl carbamates and aryl pivalates. The use of aminoacetonitriles as a cyanating agent leads to an environmentally and easy-to-use method
Radical-induced ring-opening and reconstruction of cyclobutanone oxime esters
作者:Panpan Wang、Binlin Zhao、Yu Yuan、Zhuangzhi Shi
DOI:10.1039/c8cc10109d
日期:——
The first example of intramolecular ring-opening and reconstruction of cyclobutanone oxime esters via selective C–C bond cleavage leading to the synthesis of 3,4-dihydronaphthalene-2-carbonitriles in the presence of a cheap copper catalyst has been reported. The protocol is distinguished by mild and safe reaction conditions that exclude ligands, oxidants, bases, toxic cyanide salts and tolerates a
Iridium-Catalyzed Branch-Selective and Enantioselective Hydroalkenylation of α-Olefins through C–H Cleavage of Enamides
作者:Xin Sun、En-Ze Lin、Bi-Jie Li
DOI:10.1021/jacs.2c07477
日期:2022.9.28
transformation in asymmetric catalysis. Herein we report an iridium-catalyzedasymmetric hydroalkenylation of α-olefins through directed C–H cleavage of enamides. This atom-economical addition process is highly branch-selective and enantioselective, delivering trisubstituted alkenes with an allylic stereocenter. DFT calculations reveal the origin of regio- and enantioselectivity.