5-regioselectivities and excellent chemoselectivities. Ether group could coordinate with iridium catalyst by lone-pair electron at a distance (up to four σ bonds) away from alkyne to control the regioselectivity by weak coordination effect. The cycloaddition reaction chemoselectively occurred at the propargyl ether moiety of diyne to give unique fully substituted 4-alkynyl-triazole.
远程醚基团可以用作制备具有唯一的1,5-区域选择性和优异的
化学选择性的完全取代的5-醚-
1,2,3-三唑的指导基团。醚基可以通过孤对电子在距
炔烃一定距离(最多4个σ键)的情况下与
铱催化剂配位,从而通过弱配位效应控制区域选择性。在二炔的
炔丙基醚部分发生
化学选择性的环加成反应,得到独特的完全取代的4-炔基-三唑。