Copper-Catalyzed [5 + 1] Annulation of 2-Ethynylanilines with an N,O-Acetal Leading to Construction of Quinoline Derivatives
摘要:
A novel copper-catalyzed [5 + 1] annulation of 2-ethynylanilines with an N,O-acetal, which functioned as a Cl part, leading to the preparation of quinoline derivatives with an ester substituent on the 2-position is described. A combination of CuBr2 and trifluoroacetic acid (TFA) promoting [5 + 1] annulation of the 2-ethynylaniline with ethyl glyoxylate is also demonstrated.
through photooxidation of furfural and a consecutive ring-opening alcoholysis; (ii) cyclization of ethyl 4,4-diethoxycrotonate with aniline, and (iii) hydrolysis of the generated ethyl quinaldate. This new method not only avoids the use of toxic potassiumcyanide but also meets many salient features of green chemistry, such as the use of bio-based feedstocks, environmentally benign metal-free conditions and
Copper-catalysed aerobic oxidative esterification of N-heteroaryl methanes with alcohols
作者:Min Liu、Tieqiao Chen、Shuang-Feng Yin
DOI:10.1039/c5cy02069g
日期:——
Efficient copper-catalysed aerobicoxidative esterification of N-heteroaryl methanes with alcohols has been developed. A variety of N-heteroaryl esters including those with functional groups are produced in good to excellent yields under the present reaction conditions.
Radical cation salt induced Povarov reaction between iminoethyl glyoxylate and N-vinylamides: synthesis of quinoline-2-carboxylate derivatives
作者:Xiaodong Jia、Chang Qing、Congde Huo、Fangfang Peng、Xicun Wang
DOI:10.1016/j.tetlet.2012.10.097
日期:2012.12
A domino process between iminoethyl glyoxylate and N-vinylamides was achieved under the catalytic radical cation salt induced conditions, producing a series of quinoline-2-carboxylates. N-Vinylamides were involved as an acetylene equivalent. A possible mechanism was proposed to rationalize the formation of the products. (C) 2012 Elsevier Ltd. All rights reserved.