Transition state analysis of an enantioselective Michael addition by a bifunctional thiourea organocatalyst.
Org Biomol Chem
; 17(16): 3934-3939, 2019 04 17.
Article
en En
| MEDLINE
| ID: mdl-30942247
ABSTRACT
The mechanism of the enantioselective Michael addition of diethyl malonate to trans-ß-nitrostyrene catalyzed by a tertiary amine thiourea organocatalyst is explored using experimental 13C kinetic isotope effects and density functional theory calculations. Large primary 13C KIEs on the bond-forming carbon atoms of both reactants suggest that carbon-carbon bond formation is the rate-determining step in the catalytic cycle. This work resolves conflicting mechanistic pictures that have emerged from prior experimental and computational studies.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Tiourea
Idioma:
En
Revista:
Org Biomol Chem
Asunto de la revista:
BIOQUIMICA
/
QUIMICA
Año:
2019
Tipo del documento:
Article