Synthesis of Disubstituted 3-Phenylimidazo[1,2-<i>a</i>]pyridines via a 2-Aminopyridine/CBrCl<sub>3</sub> α-Bromination Shuttle
作者:Irwan Iskandar Roslan、Kian-Hong Ng、Ji’-En Wu、Gaik-Khuan Chuah、Stephan Jaenicke
DOI:10.1021/acs.joc.6b01714
日期:2016.10.7
2-aminopyridine with phenylacetophenones, phenylacetones, or β-tetralone has been developed. Isolated yields of up to 97% were obtained at 80 °C within 5 h. The 2-aminopyridine/CBrCl3 system acts as an α-bromination shuttle by transferring Br from CBrCl3 to the α-carbon of the carbonyl moiety. This triggers a series of steps with double C–N/C–N bond formation to the final product. The distinct advantages of
已经开发了通过将2-氨基吡啶与苯基乙酰苯,苯基丙酮或β-四氢萘酮偶联来合成二取代的3-苯基咪唑并[1,2- a ]吡啶的通用方案。在80°C下5小时内,分离出的产率高达97%。2-氨基吡啶/ CBrCl 3系统通过将Br从CBrCl 3转移到羰基部分的α-碳上而充当α-溴化穿梭。这触发了一系列步骤,最终产物形成了双C–N / C–N键。该协议的显着优势包括使用可商购的廉价底物,无金属一锅法合成的简便性以及易于放大至克数的能力。