Ni(II) Salts and 2-Propanol Effect Catalytic Reductive Coupling of Epoxides and Alkynes
作者:Matthew G. Beaver、Timothy F. Jamison
DOI:10.1021/ol201702a
日期:2011.8.5
A Ni-catalyzed reductivecoupling of alkynes and epoxides using Ni(II) salts and simple alcohol reducing agents is described. Whereas previously reported conditions relied on Ni(cod)2 and Et3B, this system has several advantages including the use of air-stable and inexpensive Ni(II) precatalysts (e.g., NiBr2·3H2O) as the source of Ni(0) and simple alcohols (e.g., 2-propanol) as the reducing agent.
描述了使用 Ni(II) 盐和简单的醇还原剂对炔烃和环氧化物进行 Ni 催化的还原偶联。尽管之前报道的条件依赖于 Ni(cod) 2和 Et 3 B,但该系统具有几个优点,包括使用空气稳定且价格低廉的 Ni(II) 预催化剂(例如 NiBr 2 ·3H 2 O)作为 Ni 的来源(0) 和简单的醇(例如,2-丙醇)作为还原剂。氘标记实验与随着构型反转发生的环氧化物 C-O 键的氧化加成一致。