Total synthesis of (+/-)-didehydrostemofoline (asparagamine A) and (+/-)-isodidehydrostemofoline.
J Am Chem Soc
; 125(50): 15284-5, 2003 Dec 17.
Article
em En
| MEDLINE
| ID: mdl-14664560
ABSTRACT
The first total syntheses of (+/-)-didehydrostemofoline (1) and (+/-)-isodidehydrostemofoline (3) are reported. The synthesis begins with the Diels-Alder reaction of readily available pyrrole 9 and ethyl (E)-3-nitroacrylate, the latter serving as a regioinverted equivalent of ketene. After hydrogenation to prevent retro-Diels-Alder reaction, the major cycloadduct is transformed to 7-azabicyclo[2.2.1]heptanol 14. Aza-Cope-Mannich reaction of the formaldiminium derivative of 14 delivers 1-azatricyclo[5.3.0.04.10]decane 15, which in 15 additional steps is converted to 1 and 3.
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Base de dados:
MEDLINE
Assunto principal:
Stemonaceae
/
Alcaloides
/
Compostos Heterocíclicos de 4 ou mais Anéis
Idioma:
En
Ano de publicação:
2003
Tipo de documento:
Article