Synthesis of substituted esters of imidazoles, oxazoles, thiazoles, and diethyl pyrazine-2,5-dicarboxylate from a common acyclic precursor employing C-formylation strategy
作者:Goraksha Khose、Shailesh Shinde、Anil Panmand、Ravibhushan Kulkarni、Yogesh Munot、Anish Bandyopadhyay、Dinesh Barawkar、Santoshkumar N. Patil
DOI:10.1016/j.tetlet.2014.03.039
日期:2014.4
A novel synthetic route to substituted esters of imidazoles, oxazoles, thiazoles, and diethyl pyrazine-2,5-dicarboxylates via C-formylation of glycine ethyl ester hydrochloride is reported. This methodology is simple, robust, and gives good yields of different heterocyclic esters in one or two steps from a common acyclic precursor and is amenable to large scale synthesis.
I<sub>2</sub>/TBHP-Mediated tandem cyclization and oxidation reaction: Facile access to 2-substituted thiazoles and benzothiazoles
作者:Li Liu、Chen Tan、Rong Fan、Zihan Wang、Hongguang Du、Kun Xu、Jiajing Tan
DOI:10.1039/c8ob02826e
日期:——
readily available cysteine esters and 2-aminobenzenethiols as N and S sources. The reaction proceeds under an I2/TBHP system and involves a one-pot tandem cyclization and oxidation sequence. A diverse range of aldehydes is amenable for this transition-metal-free protocol, which provides an alternative method to rapidly access thiazole-containing molecules.
We describe a medicinal chemistry approach to generate a series of 2-(1H-pyrazol-1-yl)thiazole compounds that act as selective EP1 receptor antagonists. The obtained results suggest that compound 12 provides the best EP1 receptor antagonist activity and demonstrates good oral pharmacokinetics. (c) 2013 Elsevier Ltd. All rights reserved.