A Simple, One-Pot Synthesis of N-Alkyl and N-Aryl Thieno[2,3-d]pyrimidinones from Thiophene- and Benzothiophene-2-yl-ureas
作者:Ian A. Yule、Colin W. G. Fishwick
DOI:10.1080/00397911.2011.596985
日期:2013.1
herein describe a convenient, one-pot synthesis of N-substituted thieno and benzothieno[2,3-d]pyrimidinones from the respective thiophene-2-yl ureas. This intramolecular cyclization, which presumably proceeds via a Vilsmeier–Haack dimethyliminium intermediate, has proven to be regioselective when performed in the presence of N,N′-bisarylureas and allows for independent functionalization of the pyrimidinone
摘要我们在本文中描述了从各自的噻吩-2-基脲中方便地一锅法合成 N-取代的噻吩并和苯并噻吩并 [2,3-d] 嘧啶酮。这种分子内环化可能通过 Vilsmeier-Haack 二甲基亚胺中间体进行,已证明在 N,N'-双芳基脲存在下进行时具有区域选择性,并且允许嘧啶酮 N3 和 C4 位置的独立官能化。图形概要