Visible-Light-Mediated Intermolecular Radical Conjugate Addition for the Construction of Vicinal Quaternary Carbon Centers
作者:Lei Li、Lili Fang、Weiping Wu、Jin Zhu
DOI:10.1021/acs.orglett.0c01724
日期:2020.7.17
The visible light-driven organophotoredox catalysis is reported for the construction of vicinal quaternary carbon centers. Intermolecular conjugateaddition of alkyl radicals, derived from 2,2-disubstituted dihydroquinazolinones, to Michael acceptors under blue light irradiation and rhodamine B catalysis allows the facile assembly of diverse, vicinal secondary/quaternary, tertiary/quaternary, and
Visible light induced photoredox catalysis is an efficient method for radical activation. Herein, we report a photoredox catalyzed intramolecular radical-radical coupling reaction that proceeds through biradical intermediate. This protocol represents...
Palladium-Catalyzed Selective Synthesis of 3-Hydroxy-2-oxindoles via Cascade C–H Cycloaddition and Oxidation of α-Aminoacetophenones
作者:Ri-Yuan Tang、Wen-Xu Zheng、Yan-Yan Liao、Li Xu
DOI:10.1055/s-0037-1610537
日期:2018.12
transformation. A novel method for the synthesis of 3-hydroxy-2-oxindole (3-hydroxyindolin-2-one) derivatives by palladium-catalyzed tandem C–H cycloaddition and oxidation of α-aminoacetophenone has been developed. In the presence of Pd(OAc)2 and AgOAc, a variety of 3-hydroxy-2-oxindoles were synthesized in moderate yields. Control experiments show that the selective cycloaddition occurs prior to the oxidation
A protocol for the copper-catalyzed oxidative self-coupling of α-amino carbonylcompounds has been developed for the synthesis of tetrasubstituted 1,4-enediones (Z-isomers) in moderate to good yields through the cleavage of four sp3C–H bonds and the simultaneous formation of one C=C double bond in the α-amino carbonylcompound. The strategy has the advantages of using readily available starting materials
Thiocyanation of α-amino carbonyl compounds for the synthesis of aromatic thiocyanates
作者:Niannian Yi、Mingjing Ouyang、Huimin Liu、Miao Yan、Xiaoyong Wen、Yi Xiong、Bing Yi
DOI:10.1177/1747519820923553
日期:2021.1
A procedure for K2S2O8-mediated thiocyanation of α-amino carbonylcompounds has been developed for the synthesis of aromatic thiocyanates. A series of α-amino carbonylcompounds have been investiga...