1.
Angew Chem Int Ed Engl
; 60(41): 22393-22400, 2021 Oct 04.
Artículo
en Inglés
| MEDLINE
| ID: mdl-34382728
RESUMEN
A direct and selective synthesis of α,ß-unsaturated piperidones by a new palladium-catalyzed cascade carbonylation is described. In the presented protocol, easily available propargylic alcohols react with aliphatic amines to provide a broad variety of interesting heterocycles. Key to the success of this transformation is a remarkable catalytic cleavage of the present carbon-carbon triple bond by using a specific catalyst with 2-diphenylphosphinopyridine as ligand and appropriate reaction conditions. Mechanistic studies and control experiments revealed branched unsaturated acid 11 as crucial intermediate.