The first example of salan-vanadium catalyzed enantioselective ring-opening of meso-epoxides has been reported, which furnished β-hydroxy sulfides in good yields and moderate enantioselectivities.
The enantioselective ring-openingreaction of meso-epoxides with arylthiolscatalyzed by a chiral heterobimetallic Ti–Ga–Salen complex was realized, and the 1,2-mercapto alcohols were obtained in good yields and moderate to high enantioselectivities (up to 92% ee). A strong synergistic cooperation between different Lewis acids in the system was exhibited in the catalytic process.
Catalytic Asymmetric Ring-Opening Reaction of<i>meso</i>-Epoxides with Aryl Selenols and Thiols Catalyzed by a Heterobimetallic Gallium-Titanium-Salen Complex
Abstractmagnified imageA chiral heterobimetallic Lewis acid complex has been developed as an efficient catalyst. The enantioselective desymmetrization of meso‐epoxides with aryl selenols and thiols catalyzed by the heterobimetallic complex has been optimized. The optically active β‐arylseleno alcohols and β‐hydroxy sulfides were obtained in good yields and high enantioselectivities (up to 97% ee and 92% ee, respectively). A strong synergistic effect between different Lewis acids was exhibited in the catalytic process.
Lithium BINOL Phosphate Catalyzed Desymmetrization of <i>meso</i>-Epoxides with Aromatic Thiols
作者:Gajendrasingh Ingle、Michael G. Mormino、Jon C. Antilla
DOI:10.1021/ol502527q
日期:2014.11.7
A highly enantioselective method for desymmetrization of meso-epoxides using thiols is reported. This is the first example of epoxide activation achieved using metal BINOL phosphates. The reaction has a broad scope in terms of epoxide substrates and aromatic thiol nucleophiles. The resulting beta-hydroxyl sulfides are obtained in excellent yield and enantioselectivity.
COHEN, T.;RITTER, R. H.;OUELLETTE, D., J. AMER. CHEM. SOC., 1982, 104, N 25, 7142-7148