N-heterocyclic carbene catalyzed addition of aldehydes to diazo compounds: stereoselective synthesis of N-acylhydrazones.
Org Lett
; 15(7): 1760-3, 2013 Apr 05.
Article
en En
| MEDLINE
| ID: mdl-23527876
ABSTRACT
An innovative stereoselective synthesis of N-acylhydrazones via an unprecedented N-heterocyclic carbene catalyzed addition of aldehydes to diazo compounds is presented. Enals exclusively afforded N-acylhydrazones, in yields up to 91%. The observed regioselectivity was traced back to the reaction of the vinylogous Breslow intermediate via the acyl anion pathway over competing homoenolate, enol, and acyl azolium pathways. This unusual reaction profile was studied based on DFT calculations, which revealed that the reaction is under orbital control, rather than being ruled by charge.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Compuestos Azo
/
Aldehídos
/
Hidrazonas
/
Metano
Idioma:
En
Año:
2013
Tipo del documento:
Article