Control of the Dual Reactivity (Iminium-Dienamine) of β-Arylmethyl α,β-Unsaturated Aldehydes in Organocatalytic 1,3-Dipolar Cycloadditions with <i>N</i>-Benzoyl <i>C,N</i>-Cyclic Azomethine Imines
作者:Cristina Izquierdo、Francisco Esteban、Alejandro Parra、Ricardo Alfaro、José Alemán、Alberto Fraile、José Luis García Ruano
DOI:10.1021/jo5018519
日期:2014.11.7
1,3-Dipolar cycloadditions of C,N-cyclic azomethine imines with α,β-unsaturated aldehydes can be performed with complete control of the regio-, exo-, and enantioselectivity under aminocatalytic conditions. The so far never studied competence of the iminium-dienamine reactivity inherent to β-alkyl α,β-unsaturated aldehydes was studied, which was possible by allowing achievement of complete control of
C,N-环偶氮甲亚胺与α,β-不饱和醛的1,3-偶极环加成反应可以完全控制区域,外部-和在氨基催化条件下的对映选择性。迄今为止,尚未研究过β-烷基α,β-不饱和醛固有的亚胺二胺反应活性的能力,这是可能的,因为可以通过完全控制β-芳基甲基衍生物与偶氮甲亚胺的反应中的化学选择性来实现。使用不同的添加剂和有机催化剂,其作用已通过DFT计算和化学证明合理化。因此,有可能选择性地获得由起始烯键同时攻击C2-C3(通过亚胺基)和C3-C4(通过二烯胺)键产生的吡唑烷,它们可用作有趣的四氢异喹啉化合物的前体。