The effect of sulfoxides on the stereoselective construction of tetrahydrofurans: total synthesis of (+)-goniothalesdiol.
Chemistry
; 17(4): 1283-93, 2011 Jan 24.
Article
em En
| MEDLINE
| ID: mdl-21243696
ABSTRACT
Good to excellent stereoselectivities were achieved in the reductive cyclization (with Et(3)SiH/trimethylsilyl trifluoromethanesulfonate (TMSOTf)) of enantiopure hydroxy sulfinyl ketones en route to 2,5-cis-disubstituted tetrahydrofuran skeletons. Electrostatic effects of the exocyclic sulfoxide, which stabilized the reactive intermediate oxocarbenium conformations, were responsible for the observed stereocontrol. A model is proposed to explain the results. The use of this reaction and the asymmetric ß-ketosulfoxide reduction as key steps facilitated the total enantioselective synthesis of the natural ß-C-aryl glycoside (+)-goniothalesdiol.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Sulfóxidos
/
Produtos Biológicos
/
Furanos
/
Metano
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article