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).