step by regio- and stereoselective [4 + 2]-cycloadditions of N-amidinyliminium ions with indoles or benzothiophene. In contrast to reactions of these heterodienes with alkenes, density functional theory (DFT) calculations show that these cycloadditions take place in a concerted asynchronous fashion. The [4 + 2]-cycloaddition of N-amidinyliminium ions (1,3-diaza-1,3-dienes) with indoles and benzothiophene
我们报告说,结构复杂的
胍杂环可以通过N-脒基
亚胺离子与
吲哚或
苯并噻吩的区域和立体选择性 [4 + 2]-环加成反应一步制备。与这些异二烯与烯烃的反应相反,密度泛函理论 (DFT) 计算表明,这些环加成以协调的异步方式发生。在[4 + 2] -环的Ñ -amidinyliminium离子(1,3-二氮杂-1,3-二烯)与
吲哚和
苯并噻吩是独特的,作为与[4 + 2]的-cycloadditions N- acyliminium离子(1- oxa-3-aza-1,3-diene)显然是未知的。