Cationic dirhodium carboxylate-catalyzed synthesis of dihydropyrimidones from propargyl ureas
摘要:
Cationic Rh(II) complexes are able to catalyze the regioselective hydroamination of propargyl ureas in a 6-endo fashion. This transformation permits access to interesting substitution patterns of dihydropyrimidines, which have found use as nucleotide exchange factor inhibitors. (C) 2013 Elsevier Ltd. All rights reserved.
Cationic dirhodium carboxylate-catalyzed synthesis of dihydropyrimidones from propargyl ureas
摘要:
Cationic Rh(II) complexes are able to catalyze the regioselective hydroamination of propargyl ureas in a 6-endo fashion. This transformation permits access to interesting substitution patterns of dihydropyrimidines, which have found use as nucleotide exchange factor inhibitors. (C) 2013 Elsevier Ltd. All rights reserved.
Copper(II)-Catalyzed Alkoxyhalogenation of Alkynyl Ureas and Amides as a Route to Haloalkylidene-Substituted Heterocycles
作者:Silvia Gazzola、Egle M. Beccalli、Tea Borelli、Carlo Castellano、Maria Assunta Chiacchio、Daria Diamante、Gianluigi Broggini
DOI:10.1021/acs.joc.5b01227
日期:2015.7.17
A highly effective synthesis of haloalkylidene-substituted heterocycles by copper(II)-catalyzed cyclization of alkynyl ureas and secondary amides has been developed. The reaction, which involves a catalytic amount of CuCl2 and a stoichiometric amount of N-halosuccinimide, occurs selectively through an alkoxyhalogenation process. Alternatively, alkoxychlorination and alkoxybromination reactions can be performed working solely with stoichiometric CuCl, and CuBr2, respectively.