Cu/Chiral Phosphoric Acid-Catalyzed Asymmetric Three-Component Radical-Initiated 1,2-Dicarbofunctionalization of Alkenes
作者:Jin-Shun Lin、Tao-Tao Li、Ji-Ren Liu、Guan-Yuan Jiao、Qiang-Shuai Gu、Jiang-Tao Cheng、Yu-Long Guo、Xin Hong、Xin-Yuan Liu
DOI:10.1021/jacs.8b11736
日期:2019.1.16
copper(I) and chiral phosphoric acid cooperative catalysis strategy has been developed, providing straightforward access to chiral triarylmethanes bearingquaternaryall-carbonstereocenters with high efficiency as well as excellent chemo- and enantioselectivity. The key to success is not only the introduction of a sterically demanding chiral phosphoric acid to favor radical difunctionalization over the
acid and aryl iodide derivatives was studied using both homogeneous and heterogeneous Pd-catalysts. It was demonstrated that simple Pd(OAc)2 can catalyze this reaction with useful to high yields when engaging ferulic acid whatever the nature of the aryl iodide. However, limitations were found when varying the nature of the cinnamic acid derivatives mainly due to low decarboxylation process. This could
Mechanistic studies of photohydration of <i>m</i>-hydroxy-1,1-diaryl alkenes
作者:John G Cole、Peter Wan
DOI:10.1139/v01-196
日期:2002.1.1
reported for the parent m-hydroxy-α-phenylstyrene (5), which has been proposed as consisting of a water trimer-mediated excited state (formal) intramolecularprotontransfer (ESIPT) from the phenolic proton to the β-carbon of the alkene moiety to give an observable (by laser flash photolysis (LFP)) m-quinonemethide intermediate 6. For this purpose, derivatives of 5 with substituents (methyl or methoxy) on