A Concise Entry into Nonsymmetrical Alkyl Polyamines
作者:Tracey Pirali、Grazia Callipari、Emanuela Ercolano、Armando A. Genazzani、Giovanni Battista Giovenzana、Gian Cesare Tron
DOI:10.1021/ol801612r
日期:2008.10.2
The synthesis of nonsymmetrical polyamines (PAs) has, up to now, been problematic due to lengthy synthetic procedures, lack of regioselectivity, and very poor atom economy. An innovative synthetic protocol for nonsymmetrical PAs using a modified Ugi reaction (N-split Ugi) which simplifies the synthesis of these tricky compounds is described. We believe that this new synthesis may open the door for the generation of new and pharmacologically active PAs.
Efficient Synthesis of α-Ketoamides via 2-Acyl-5-aminooxazoles by Reacting Acyl Chlorides and α-Isocyanoacetamides
Acyl chlorides and alpha-isocyanoacetamides undergo an efficient reaction in dichloromethane in the presence of triethylamine to give 2-acyl-5-aminooxazoles. Subsequent acid hydrolysis of the 5-aminooxazole moiety leads to alpha-ketoamides in good overall yields.