2-a]pyridines with exclusive regioselectivity in moderate to excellent yields has been developed. This cascade was initiated through propargylation of 2-aminopyridines at pyridine-nitrogen with propargyl alcohol derivatives using Cu(II)-Pybox as catalyst and followed by an intramolecular cyclization and isomerization. Besides 2-aminopyridine, less reactive 2-aminopyrimidine, 2-aminopyrazine and 3-aminopyridazine
已经开发出一种高效的级联序列,用于合成2,3-二取代的
咪唑并[1,2- a ]
吡啶,具有中度到优异的排他选择性。该级联反应是通过使用
铜(II)-Pybox作为催化剂在炔丙基醇衍
生物上于
吡啶氮原子处将2-
氨基吡啶进行炔丙基化反应开始的,然后进行分子内环化和异构化。除了2-
氨基吡啶,反应性较低的2-
氨基嘧啶,2-
氨基吡嗪和3-
氨基
哒嗪也适用于该级联反应。