Convenient Multicomponent One‐Pot Synthesis of 2‐Iminothiazolines and 2‐Aminothiazoles Using Elemental Sulfur Under Aqueous Conditions
作者:András Gy. Németh、Bence Marlok、Attila Domján、Qinghe Gao、Xinya Han、György M. Keserű、Péter Ábrányi‐Balogh
DOI:10.1002/ejoc.202100548
日期:2021.7.7
A multicomponent one-pot process led to the formation of diversely trisubstituted 2-iminothiazolines and disubstituted 2-aminothiazoles underaqueousconditions. Starting from isocyanides, amines, 2’-bromoacetophenones, and aqueous polysulfide solution or sulfurpowder, this efficient procedure enabled the chromatography-free separation of solid products.
CuBr<sub>2</sub> mediated synthesis of 2-Aminothiazoles from dithiocarbamic acid salts and ketones
作者:Baohua Zhang、Lanxiang Shi
DOI:10.1080/10426507.2019.1633316
日期:2019.12.2
Abstract In a one-pot procedure, CuBr2 has been used as a efficient desulfurizing agent in the synthesis of 2-aminothiazoles by the condensation of in situ-generated 1-substituted thioureas from their dithiocarbamic acidsalts, with in situ-generated α-bromoketones from ketones. All reactions were carried out under optimized reaction conditions and gave the target products in 61–95% yield.
Bromineless Bromine as an Efficient Desulfurizing Agent for the Preparation of Cyanamides and 2-Aminothiazoles from Dithiocarbamate Salts
作者:Ramesh Yella、Veerababurao Kavala、Bhisma K. Patel
DOI:10.1080/00397911003642658
日期:2011.2.28
desulfurizing agent in the preparation of organic cyanamides and substituted thiazoles starting from dithiocarbamicacidsalts. In this approach, alkyl/aryl isothiocyantes were first obtained by the desulfurization of dithiocarbamicacidsalts with EDPBT. The in situ–generated isothiocyanates reacts with an aqueous ammonia, forming alkyl or aryl thioureas, which on subsequent oxidative desulfurization
copper-catalyzed coupling of oximeacetates with isothiocyanates. Various 4-substituted and 4,5-disubstituted 2-aminothiazoles were formed smoothly under mild reaction conditions. This process involved copper-catalyzed N–O bond cleavage, activation of vinyl sp2 C–H bonds, and C–S/C–N bond formations. It is noteworthy that the oximeacetates were used not only as a substrate but also as a single oxidant