series of Schiff bases in the condensationreaction between benzaldehydes and anilines, in the absence of solvent. Benzaldehydes and anilines, containing either electron‐withdrawing or electron‐releasing groups, were assessed to identify any substituent effect on the formation of the Schiff bases. This methodology is characterized by ease of set‐up and work‐up, and the reaction yields were comparable with
Cobalt-catalyzed ortho-alkenylation of aromatic aldimines via chelation-assisted C–H bond activation
作者:Takeshi Yamakawa、Naohiko Yoshikai
DOI:10.1016/j.tet.2013.02.092
日期:2013.6
An ortho-alkenylation reaction of an aromatic aldimine with an internal alkyne is efficiently promoted by a cobalt catalyst generated from CoBr2, triarylphosphine, and iPrMgBr. The reaction takes place under mild room-temperature conditions to afford, upon acidic hydrolysis, a variety of ortho-alkenylated aromatic aldehydes in moderate to excellent yields. The neighboring formyl and alkenyl groups