An efficient approach to dispacamide A and its derivatives.
Org Biomol Chem
; 10(5): 978-87, 2012 Feb 07.
Article
em En
| MEDLINE
| ID: mdl-22159215
ABSTRACT
Dispacamide A and new analogs of this marine alkaloid were prepared in seven steps with an overall yield ranging from 12 to 33%. The key step of the strategy was a stereocontrolled Knoevenagel condensation under microwave dielectric heating in the last step. In this condensation, the 2-aminoimidazolin-4-one hydrochloride partners 10a-c were synthesized in three steps with good overall yields (33-79%) via the ring closure of N-guanidino acetic acids 9a-c and the aldehydes 5a,b as the two others building-blocks, in 3 steps with 60-66% overall yields. The six synthetic products have been obtained with a Z geometry about their exocyclic bond on the basis of (13)C/(1)H long-range coupling constants using a gHSQMBC experiment.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Poríferos
/
Produtos Biológicos
/
Alcaloides
Limite:
Animals
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article