<scp>D</scp>-Glucosamine in iron-catalysed cross-coupling reactions of Grignards with allylic and vinylic bromides: application to the synthesis of a key sitagliptin precursor
作者:Matej Sova、Rok Frlan、Stanislav Gobec、Gaj Stavber、Zdenko Časar
DOI:10.1002/aoc.3327
日期:2015.8
iron‐catalysed CC cross‐coupling reactions for the first time. The Fe(acac)2/D‐glucosamine·HCl/Et3N catalytic system was effective at 5 mol% loading in coupling reactions of Grignard reagents with organic bromides. Moderate to high efficiency was achieved with preserved stereochemistry when allyl (Csp3) or alkenyl (Csp2) bromides were coupled with phenylmagnesium (Csp2) or benzylmagnesium (Csp3) bromides. The
甲可持续d葡糖胺配体成功地引入到铁-催化的Ç C交叉耦合的第一次反应。Fe(acac)2 / D-葡萄糖胺·HCl / Et 3 N催化体系在格氏试剂与有机溴化物的偶联反应中以5 mol%的负载量有效。当烯丙基(Csp 3)或烯基(Csp 2)溴化物与苯基镁(Csp 2)或苄基镁(Csp 3)偶联时,通过保留立体化学可实现中度至高效)溴化物。所开发的催化系统也已成功地用于新颖经济地制备迈克尔-受体样原料,用于原料西他列汀的替代合成中,西他列汀是一种已知的用于治疗II型糖尿病的重磅炸弹。版权所有©2015 John Wiley&Sons,Ltd.