2,3-Di-O-picolinyl building blocks as glycosyl donors with switchable stereoselectivity.
Org Biomol Chem
; 14(11): 3159-69, 2016 Mar 21.
Article
em En
| MEDLINE
| ID: mdl-26911322
ABSTRACT
2-O-Picolinyl protected glycosyl donors lead to the formation of 1,2-trans glycosides with complete stereoselectivity. This is due to the participatory effect of the picolinyl nitrogen that is able to block the bottom face of the ring via a six-membered cyclic intermediate. Herein we demonstrate that if the nitrogen atom of the O-picolinyl moiety is temporarily blocked by coordination to the metal center (Pd), it becomes unavailable to participate in glycosylation and hence the stereoselectivity of 2-O-picolinyl-assisted glycosylations can be "switched".
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Picolinas
/
Glicosídeos
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article