Nickelocene as an Air- and Moisture-Tolerant Precatalyst in the Regioselective Synthesis of Multisubstituted Pyridines
作者:Il Young Cho、Woo Gyum Kim、Ji Hwan Jeon、Jeong Woo Lee、Jeong Kon Seo、Jongcheol Seo、Sung You Hong
DOI:10.1021/acs.joc.1c00577
日期:2021.7.16
Ni(COD)2-catalyzed cycloaddition reactions to access pyridines have been extensively studied. However, this catalyst typically requires drying procedures and inert-atmosphere techniques for the reactions. Herein, we report operationally simple nickel(0) catalysis to access substituted pyridines from various nitriles and 1,6-diynes without the aid of air-free techniques. The Ni-Xantphos-based catalytic
镍(COD) 2已经广泛研究了用于获得吡啶的催化环加成反应。然而,这种催化剂通常需要干燥程序和惰性气氛技术来进行反应。在此,我们报告了操作简单的镍 (0) 催化,无需借助无空气技术即可从各种腈和 1,6-二炔中获得取代吡啶。基于 Ni-Xantphos 的催化歧管耐受空气、水分和热量,同时促进 [2 + 2 + 2] 环加成反应,反应产率高,底物范围广。此外,我们公开了不仅空间效应而且前沿分子轨道相互作用都可以在确定镍催化的 [2 + 2 + 2] 环加成合成取代吡啶的区域化学结果方面发挥关键作用。