Platination of 6-phenylimidazo[2,1-b]thiazole at the imidazole N atom to give chloro(ethylenediamine)(6-phenylimidazo[2,1-b]thiazole) platinum(II) nitrate, [PtCl-(C2H8N2)(C11H8N2S)]NO3 , is accompanied by a rotation of 49.3(8)degrees of the phenyl ring and a loss of extended conjugation in the normally planar 6-phenylimidazo[2,1-b]thiazole molecule.
DABCO catalyzed highly regioselective synthesis of fused imidazo-heterocycles in aqueous medium
作者:Vikas M. Bangade、B. Chennakesava Reddy、Pramod B. Thakur、B. Madhu Babu、H.M. Meshram
DOI:10.1016/j.tetlet.2013.06.123
日期:2013.8
efficient regioselectivesynthesis of 3-aryl imidazo[1,2-a]pyridines, 5-aryl imidazo[2,1-b]thiazoles, and 3-aryl benzo[d]imidazo[2,1-b][1,3]thiazoles is described by the reaction of phenacyl bromide with heterocyclic amine in the presence of DABCO under aqueousmedium. The method is applicable for a variety of substituted phenacyl bromides as well as 2-amino-heterocycles. An aqueous reaction medium, regioselectivity
有效的区域选择性合成3-芳基咪唑并[1,2- a ]吡啶,5-芳基咪唑并[2,1- b ]噻唑和3-芳基苯并[ d ]咪唑并[2,1- b ] [1, 3]噻唑的描述是在水介质中在DABCO存在下,苯甲酰溴与杂环胺反应。该方法适用于各种取代的苯甲酰溴以及2-氨基杂环。水性反应介质,区域选择性,温和的反应条件和高产率的产物是该方案的重要特征。
Metal-free, base catalyzed oxidative amination and denitration reaction: Regioselective synthesis of 3-arylimidazo[1,2-a]pyridines
作者:Elango Sankari Devi、Anitha Alanthadka、Subbiah Nagarajan、Vellaisamy Sridharan、Chockalingam Uma Maheswari
DOI:10.1016/j.tetlet.2018.08.024
日期:2018.9
metal-free, regioselective strategy for the synthesis of 3-arylimidazo[1,2-a]pyridines from β-nitrostyrenes and 2-aminopyridines using triethylamine as the catalyst and H2O2 (30% aq.) as the oxidant is reported. The use of an inexpensive base and facile reaction conditions make this strategy a practical alternative for the synthesis of 3-arylimidazo[1,2-a]pyridines.
使用三乙胺作为催化剂,以H 2 O 2(30%水溶液)为氧化剂,从金属上合成β-硝基苯乙烯和2-氨基吡啶的3-芳基咪唑并[1,2- a ]吡啶的无金属区域选择性策略是报告。使用廉价的碱和容易的反应条件使该策略成为合成3-芳基咪唑并[1,2- a ]吡啶的实用替代方法。