Synthesis of 3-benzazepines and azepino[4,5-b]heterocyclic ring systems via intramolecular Friedel–Crafts cyclization
作者:Robert B. Kargbo、Zohreh Sajjadi-Hashemi、Sujata Roy、Xiaomin Jin、R. Jason Herr
DOI:10.1016/j.tetlet.2013.02.012
日期:2013.4
The intramolecular Friedel–Crafts cyclization was found to be effective for the synthesis of 3-benzazepines and azepino[4,5-b]heterocyclic ring systems using simple allylic bromides tethered to activated aromatic nuclei. Amongst the various Lewis acids screened, Bi(OTf)3 was found to be the most effective ‘ecofriendly’ catalyst for the cyclization.
发现分子内的Friedel-Crafts环化可有效地使用简单的烯丙基溴束缚在活化的芳香核上,从而合成3-苯并ze庚因和azepino [4,5- b ]杂环系统。在所筛选的各种路易斯酸中,发现Bi(OTf)3是最有效的环化“生态友好型”催化剂。