Cyclization Cascade of Hydrazono Ugi Adducts towards Pyrazoles
作者:Asma Agrebi、Fatma Allouche、Fakher Chabchoub、Laurent El Kaïm
DOI:10.1002/ejoc.201300787
日期:2013.9
Acidic hydrolysis of Ugiadducts formed from α-hydrazonocarboxylic acids and aminoacetaldehyde dimethyl acetal leads to the fragmentation of aminoacetaldehyde residues with final formation of pyrazoles. An aldol-type reaction of the hydrazone is proposed as the key step of the cascade.
由 α-腙羧酸和氨基乙醛二甲缩醛形成的 Ugi 加合物的酸性水解导致氨基乙醛残基的断裂,最终形成吡唑。腙的醇醛型反应被提议作为级联的关键步骤。