The Ugly Duckling Metamorphosis: The Ammonia/Formaldehyde Couple Made Possible in Ugi Reactions.
作者:Thaissa Pasquali F. Rosalba、Samia Sayegh A. Kas、Ana Beatriz S. Sampaio、Carlos Eduardo M. Salvador、Carlos Kleber Z. Andrade
DOI:10.1002/ejoc.202001671
日期:2021.5.26
The ammonia/formaldehyde couple (the ugly duckling in Ugi reactions) was finally made possible using hexamethylenetetramine (HMTA) as an efficient formaldehyde surrogate. Various NH-free Ugi adducts were obtained in moderate to excellent yields and two of them were converted to diketopiperazines (DKPs).
最终,使用六亚甲基四胺(HMTA)作为有效的甲醛替代物,可以使氨/甲醛对(在Ugi反应中为丑小鸭)成为可能。以中等至极高的收率获得了各种不含NH的Ugi加合物,其中两个被转化为二酮哌嗪(DKPs)。