1,3-Asymmetric Induction in Diastereoselective Allylations of Chiral N-Tosyl Imines.
J Org Chem
; 87(5): 2773-2778, 2022 03 04.
Article
en En
| MEDLINE
| ID: mdl-35029404
ABSTRACT
Lewis acid mediated allylations of ß-alkoxy N-tosyl imines using allyltrimethylsilane lead to 3-alkoxy homoallylic N-tosyl amines with anti-selectivity. Two methods of Cu(OTf)2-mediated allylations are reported herein, demonstrating that diastereoselectivity can be achieved through 1,3 acyclic stereocontrol of ß-chiral aldimines. Observed selectivity trends and computational evidence suggest selectivity arises through the formation of a six-membered ring chelate. The product ratios of these allylations are dependent on conformational preferences of the chelate and steric effects in the transition-state structures.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Aminas
/
Iminas
Idioma:
En
Revista:
J Org Chem
Año:
2022
Tipo del documento:
Article
País de afiliación:
Estados Unidos