Alumina-Supported Cu(II), A Versatile and Recyclable Catalyst for Regioselective Ring Opening of Aziridines and Epoxides and Subsequent Cyclization to Functionalized 1,4-Benzoxazines and 1,4-Benzodioxanes
作者:Sukalyan Bhadra、Laksmikanta Adak、Subhas Samanta、A. K. M. Maidul Islam、Manabendra Mukherjee、Brindaban C. Ranu
DOI:10.1021/jo101916e
日期:2010.12.17
catalyst, alumina-supported copper(II), efficiently catalyzes the ring opening of aziridines and epoxides followed by cyclization of the corresponding intermediate to produce a variety of functionalized 1,4-benzoxazines and 1,4-benzodioxanes, respectively, in one pot without any ligand in high yields. The ring cleavages of aziridines and epoxides are highly regioselective. The catalyst is inexpensive
一种容易获得的催化剂,氧化铝负载的铜(II),可有效催化氮丙啶和环氧化物的开环,然后环化相应的中间体,分别制得各种官能化的1,4-苯并恶嗪和1,4-苯并二恶烷。一锅没有任何配体的高产量。氮丙啶和环氧化物的环裂解是高度区域选择性的。该催化剂便宜,对空气不敏感,环境友好且可回收。假定催化剂的功能和反应途径。该协议已成功用于在一个锅中形成三个碳-杂原子键,即C-O,C-N和C-S。