A convenient, recyclable catalytic synthesis of benzofuran-2-acetic esters 2 by sequential Pd(0)-catalyzed deallylation—Pd(II)-catalyzed carbonylative heterocyclization of 1-(2-allyloxyphenyl)-2-yn-1-ols 1 in ionicliquids is presented. Reactions were typically carried out in BmimBF4 as the solvent at 100 °C and under 30 atm of CO, in the presence of catalytic amounts (1 mol %) of PdI2 in conjunction
Gold-Catalyzed Controllable C2-Functionalization of Benzofurans with Aryl Diazoesters
作者:Guangyang Xu、Kai Liu、Jiangtao Sun
DOI:10.1021/acs.orglett.7b03390
日期:2018.1.5
A ligand-controlled gold-catalyzed chemoselective C2-functionalization of benzofuran substrates with aryl diazoesters has been developed. The use of IPrAu(PhCN)BArF provides unprecedented dearomatization products bearing a newly formed carbon–carbon double bond at the C2 position of benzofurans. In contrast, the C2-alkylation products have been isolated as the major products for phosphite gold catalysis
Sequential homobimetallic catalysis: an unprecedented tandem Pd(0)-catalysed deprotection ? Pd(ii)-catalysed heterocyclisation reaction leading to benzofurans
We report here the first example of "sequential homobimetallic catalysis": a transition metal catalyst with the metal in a certain oxidation state catalyses the deprotection of a functional group, which in situ undergoes a subsequent transformation catalysed by another complex of the same metal but in a different oxidation state.