Copper(II)-Mediated Aerobic Synthesis of Imidazo[1,2-<i>a</i>]pyridines via Cascade Aminomethylation/Cycloisomerization of Alkynes
作者:Irina V. Rassokhina、Valerii Z. Shirinian、Igor V. Zavarzin、Vladimir Gevorgyan、Yulia A. Volkova
DOI:10.1021/acs.joc.5b02102
日期:2015.11.6
A single copper(II)-catalyzed three-component cascade aminomethylation/cycloisomerization of propiolates to form imidazo[1,2-a]pyridines was explored. A straightforward method was developed for the practical synthesis of functionalized imidazo[1,2-a]pyridines from benzaldehydes, 2-aminopyridines, and propiolate derivatives catalyzed by Cu(OAc)2 hydrate in the presence of air. The protocol is marked
探索了单一的铜(II)催化的丙酸酯的三组分级联氨甲基化/环异构化形成咪唑并[1,2- a ]吡啶。开发了一种简单的方法,用于在空气中由Cu(OAc)2水合物催化从苯甲醛,2-氨基吡啶和丙酸酯衍生物实际合成官能化的咪唑并[1,2- a ]吡啶。该方案的特点是具有优异的收率,官能团耐受性,最重要的是具有合成咪唑并[1,2 - a ]吡啶基药物分子(如Alpidem)的适应性。
Synthesis and antiproliferative activity evaluation of steroidal imidazo[1,2-a]pyridines
作者:Irina V. Rassokhina、Yulia A. Volkova、Andrey S. Kozlov、Alexander M. Scherbakov、Olga E. Andreeva、Valerik Z. Shirinian、Igor V. Zavarzin
DOI:10.1016/j.steroids.2016.06.001
日期:2016.9
An elegant approach to unknown steroidal imidazo[1,2-a]pyridine hybrids is disclosed. Unique derivatives of androstene and estrane series containing imidazo[1,2-a]pyridine motifs were prepared from 17-ethynyl steroids in good yields via copper-catalyzed cascade aminomethylation/cycloisomerization with imines. The synthesized compounds were screened for cytotoxicity against human breast (MCF-7, MDA-MB-231, HBL-100, MDA-MB-453) and prostate (LNCaP-LN3, PC-3, DU 145) cancer cell lines. The majority of tested compounds showed activities at mu M level in breast cancer cells. The hormone-responsive breast cancer cells MCF-7 were more sensitive to novel compounds than ER alpha-negative cells; in particular, compounds 6a,b exhibited promising cytotoxicity against this cell line with the IC50 values in the range of 3-4 mu M. Furthermore, compound 4a showed remarkable effetts as a selective ER alpha receptor modulator. (C) 2016 Elsevier Inc. All rights reserved.