Concise enantiospecific, stereoselective syntheses of (+)-crispine A and its (-)-antipode.
J Org Chem
; 76(6): 1605-13, 2011 Mar 18.
Article
en En
| MEDLINE
| ID: mdl-21341807
ABSTRACT
An enantiospecific and stereoselective total synthesis of the natural product (+)-crispine A has been demonstrated employing a Pictet-Spengler bis-cyclization reaction between commercially available (R)-(-)-methyl 2-amino-3-(3,4-dimethoxyphenyl)propanoate and 4-chloro-1,1-dimethoxybutane to preferentially provide the cis tricyclic adduct. Decarboxylation by a convenient two-step protocol provided the enantiopure natural product in three steps with an overall isolated yield of 32% from the amino acid. The unnatural antipode (-)-crispine A was similarly prepared in three steps from the commercially available (S)-(+)-amino acid.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Isoquinolinas
Idioma:
En
Revista:
J Org Chem
Año:
2011
Tipo del documento:
Article
País de afiliación:
Estados Unidos