A stereoselective sequential organocascade and multicomponent approach for the preparation of tetrahydropyridines and chimeric derivatives
作者:Radell Echemendía、Gustavo P. da Silva、Meire Y. Kawamura、Alexander F. de la Torre、Arlene G. Corrêa、Marco A. B. Ferreira、Daniel G. Rivera、Márcio W. Paixão
DOI:10.1039/c8cc06871b
日期:——
A stereoselective multicomponent approach leading to a novel class of pentasubstituted tetrahydropyridines is described. Variation of the components enabled the incorporation of peptide, sugar and steroid moieties to access chimeric derivatives. DFT calculations provide insights about the unprecedented high diastereoselectivity of the MCR.
Catalyst-free visible light-promoted defunctionalization of alkyl isocyanides with a hydrosilane through C–N bond cleavage
作者:Yu-Qing Ma、Shi-Kai Tian
DOI:10.1039/d4ob00173g
日期:——
A radical initiator-free defunctionalization reaction of alkylisocyanides with a hydrosilane has been established through C–N bond cleavage under catalyst-free visible light irradiation. Various alkylisocyanides participated in the defunctionalization with tris(trimethylsilyl)silane under blue light irradiation at room temperature, delivering the reduced products in good yields with high chemoselectivity
Acyl chlorides and alpha-isocyanoacetamides undergo an efficient reaction in dichloromethane in the presence of triethylamine to give 2-acyl-5-aminooxazoles. Subsequent acid hydrolysis of the 5-aminooxazole moiety leads to alpha-ketoamides in good overall yields.