An Atom‐Economical Approach to 2‐Aryloxypyridines and 2,2′/2,3′‐Diaryloxybipyridines
<i>via</i>
Ruthenium‐Catalyzed [2+2+2] Cycloadditions
作者:Pratibha Kalaramna、Divya Bhatt、Himanshu Sharma、Avijit Goswami
DOI:10.1002/adsc.201900553
日期:2019.9.17
solvent‐free approach for the synthesis of 2‐aryloxypyridines with good to excellent yields has been developed by the reaction of 1,6‐diynes with aryl cyanates. This atom‐economical catalytic strategy offers a mild and practical approach to access a variety of such cycloadducts with excellent regioselectivities. The protocol was further extended to the synthesis of 2,2′‐ and 2,3′‐diaryloxybipyridines by the
通过1,6-二炔与氰酸芳基酯的反应,已经开发出了一种高效的,钌(II)催化,无溶剂的合成2-芳氧基吡啶的方法,其收率良好至极好。这种原子经济的催化策略提供了一种温和而实用的方法,可访问多种具有出色区域选择性的此类环加合物。通过四炔与氰酸芳基酯的反应,该方案进一步扩展到2,2'-和2,3'-二芳氧基联吡啶的合成。