Kinetics and Mechanism of the Aminolysis of O-Methyl S-Aryl Thiocarbonates in Acetonitrile
作者:Hyuck-Keun Oh
DOI:10.5012/bkcs.2011.32.5.1539
日期:2011.5.20
The aminolysis of O-methyl S-aryl thiocarbonates with benzylamines are studied in acetonitrile at -45.0. The () values are in the range 0.62-0.80 with a negative cross-interaction constant, = -0.42, which are interpreted to indicate a concerted mechanism. The kinetic isotope effects involving deuterated benzylamine nucleophiles () are large, = 1.29-1.75, suggesting that the N-H(D) bond is partially
Palladium-Catalyzed, Copper(I)-Promoted Methoxycarbonylation of Arylboronic Acids with <i>O</i>-Methyl <i>S</i>-Aryl Thiocarbonates
作者:Ya-Fang Cao、Ling-Jun Li、Min Liu、Hui Xu、Hui-Xiong Dai
DOI:10.1021/acs.joc.0c00198
日期:2020.3.20
Here, we report O-methyl S-aryl thiocarbonates as a versatile esterification reagent for palladium-catalyzed methoxycarbonylation of arylboronic acid in the presence of copper(I) thiophene-2-carboxylate (CuTC). The reaction condition is mild, and a variety of substituents including sensitive -Cl, -Br, and free -NH2 could be tolerated. Further applications in the late-stage esterification of some pharmaceutical