作者:James F. Kerwin、Samuel Danishefsky
DOI:10.1016/s0040-4039(00)87694-7
日期:1982.1
A hetero Diels-Alder route to 5,6-dihydro-γ-pyridones is described. Recently, we described the Lewis Acid catalyzed cyclocondensation of aldehydes with siloxydienes to give 5,6-dihydro-γ-pyrones. It was of interest to attempt to extend this reaction to include the imino linkage. Certainly, there have been reports of intermolecular 2 + 4 cycloadditions to “C = N” dienophiles.2 However, they have involved
描述了到5,6-二氢-γ-吡啶酮的杂Diels-Alder路线。最近,我们描述了路易斯酸催化的醛与甲硅烷二烯的环缩合反应,得到5,6-二氢-γ-吡喃酮。试图扩大该反应以包括亚氨基键是令人感兴趣的。当然,已经有报道称分子间2 + 4环加成到“ C = N”双亲物上。2然而,它们都涉及特别激活乙醛酰亚胺(参见如图1所示,3个酰基亚胺(通过假定前体2)4或双活化的亚胺(参见3)。5此外,我们注意到的Weinreb已优雅利用分子内第尔斯-阿尔德酰基亚胺的反应6 作为生物碱合成的新策略。