Catalytic Asymmetric Ring-Opening/Cyclopropanation of Cyclic Sulfur Ylides: Construction of Sulfur-Containing Spirocyclopropyloxindoles with Three Vicinal Stereocenters.
Org Lett
; 20(24): 7794-7797, 2018 12 21.
Article
en En
| MEDLINE
| ID: mdl-30520647
ABSTRACT
A highly efficient asymmetric ring-opening/cyclopropanation reaction of ( E)-3-(oxyethylidene)-2-oxoindolines with 1-alkyl-3-oxotetrahydro-1 H-thiophen-1-ium salts as cyclic sulfur ylides was realized by using a chiral N, N'-dioxide/Mg(OTf)2 complex as catalyst. A range of sulfur-containing syn, anti spirocyclopropyloxindoles with three contiguous stereocenters were obtained in excellent yields with excellent dr and good ee values under mild reaction conditions. The origin of stereoselectivity was discussed.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Org Lett
Asunto de la revista:
BIOQUIMICA
Año:
2018
Tipo del documento:
Article