1427-09-4Relevant articles and documents
Highly efficient heterogeneous copper-catalysed coupling of oxime acetates with isothiocyanates leading to 2-aminothiazoles
Tuo, Yuxink,Yao, Fang,Liao, Yang,Cai, Mingzhong
, p. 225 - 229 (2017/06/20)
The heterogeneous coupling reaction of oxime acetates with isothiocyanates was achieved at 110°C in toluene in air in the presence of a bidentate nitrogen-functionalised MCM-41-immobilised copper(I) complex (MCM-41-2N-CuI) with Cs2CO3 as base to afford a variety of 2-aminothiazoles in good yields. The MCM-41-2N-CuI catalyst can be easily recovered by a simple filtration and reused at least eight times without significant loss of activity.
Copper-Catalyzed Coupling of Oxime Acetates with Isothiocyanates: A Strategy for 2-Aminothiazoles
Tang, Xiaodong,Zhu, Zhongzhi,Qi, Chaorong,Wu, Wanqing,Jiang, Huanfeng
supporting information, p. 180 - 183 (2016/02/03)
A new strategy for 2-aminothiazoles is developed via the copper-catalyzed coupling of oxime acetates 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 oxime acetates were used not only as a substrate but also as a single oxidant.
Green approach: An efficient synthesis of 2,4-disubstituted-1,3-thiazoles and selenazoles in aqueous medium under ultrasonic irradiation
Ramesh, Gondru,Janardhan, Banothu,Rajitha, Bavantula
, p. 8099 - 8109 (2015/04/16)
An efficient and rapid procedure for the synthesis of 2,4-disubstituted-1,3-thiazoles and selenazoles has been described by the reaction of α-bromoketones with thiourea, phenylthiourea and selenourea at ambient temperature in aqueous medium under ultrasonic irradiation. Analytically pure products were formed within 10-60 s in excellent yields. The advantageous features of this non-conventional methodology over conventional methods are the operational simplicity, easy handling, yield-enhancing, time-reducing, mild reaction conditions and no by-product production.
Effect of substituents on the regioselectivity of the reaction of α-tosyloxyketones with thioureas in acidic medium: Access to 2-aminothiazoles and 2-imino-2,3-dihydrothiazoles
Aggarwal, Ranjana,Kumar, Rajiv,Sanz, Dionisia,Claramunt, Rosa M.
, p. 598 - 603 (2014/06/10)
Regioselective condensation of α-tosyloxyacetophenones 1 and N-substituted thioureas 2 in acidic medium to give regioisomers 2-aminothiazoles I and 2-imino-2,3-dihydrothiazoles II is largely influenced by the substituents present on 1 and 2. A mechanism,
Facile one-pot procedure for the synthesis of 2-aminothiazole derivatives
Yin, Guodong,Ma, Junrui,Shi, Houqiang,Tao, Qing
experimental part, p. 1941 - 1948 (2012/09/07)
A facile, efficient synthesis of 2-aminothiazole derivatives by the reaction of easily available aromatic methyl ketones with thiourea/N-substituted thioureas in the presence of copper(II) bromide was developed. The reaction underwent a one-pot ?-bromination/cyclization process.
Small molecule library synthesis using segmented flow
Thompson, Christina M.,Poole, Jennifer L.,Cross, Jeffrey L.,Akritopoulou-Zanze, Irini,Djuric, Stevan W.
experimental part, p. 9161 - 9177 (2012/01/03)
Flow chemistry has gained considerable recognition as a simple, efficient, and safe technology for the synthesis of many types of organic and inorganic molecules ranging in scope from large complex natural products to silicon nanoparticles. In this paper
One-pot synthesis of 2-aminothiazoles in PEG-400
Jawale, Dhanaji V.,Lingampalle, Dinesh L.,Pratap, Umesh R.,Mane, Ramrao A.
experimental part, p. 412 - 416 (2010/12/24)
A facile one-pot synthesis of 2-aminothiazoles has been carried in PEG-400 as a greener medium at room temperature. This method avoids the use of lachrymatric α-bromoketones as well as the volatile, toxic organic solvents.
Efficient synthesis of 2-aminothiazoles and fanetizole in liquid PEG-400 at ambient conditions
Lin, Pei-Ying,Hou, Rei-Sheu,Wang, Huey-Min,Kang, Iou-Jiun,Chen, Ling-Ching
experimental part, p. 455 - 458 (2010/06/11)
A simple and practical procedure for the synthesis of 2-aminothiazoles from α-tosyloxyketones and thioureas is described using PEG-400[poly(ethylene glycol-400)] at ambient conditions. The developed protocol is successfully applied for the preparation of an anti-inflammatory drug, Fanetizole.
Catalyst-free efficient synthesis of 2-aminothiazoles in water at ambient temperature
Potewar, Taterao M.,Ingale, Sachin A.,Srinivasan, Kumar V.
, p. 5019 - 5022 (2008/09/21)
A highly efficient and facile method has been described for the synthesis of substituted 2-aminothiazoles in water without any added catalyst or co-organic solvent. The reaction was carried out at ambient temperature and the products were obtained in excellent isolated yields. The developed protocol is successfully applied for the preparation of an anti-inflammatory drug, fanetizole.
The Hantzsch Thiazole Synthesis under Acidic Conditions: Change of Regioselectivity
Bramley, (Miss) Susan E.,Dupplin, Viscount,Goberdhan, Dhanesh G. C.,Meakins, G. Denis
, p. 639 - 644 (2007/10/02)
The condensation of α-halogeno ketones with N-monosubstituted thioureas in neutral solvent leads exclusively to 2-(N-substituted amino)thiazoles.In the present work it was shown that under acidic conditions mixtures of 2-(N-substituted amino)thiazoles and 3-substituted 2-imino-2,3-dihydrothiazoles are formed. (The isomers were distinguished by characteristic differences between their 5-H 1H n.m.r. signals and the i.r.CO bands of their trifluoroacetate derivatives.) The proportions of the 2-imino-2,3-dihydrothiazoles in the mixtures are influenced by experimental features and by the structures of the starting materials.Reactions in 10 M-HCl-EtOH (1:2) at 80 deg C for 20 min were found to be the most efficient for generating 2-imino-2,3-dihydrothiazoles; in the most favourable case 2-imino-3,4-dimethyl-2,3-dihydrothiazole was obtained in 73 percent yield.A possible explanation of the results is discussed.