Asymmetric Synthesis of Chiral Sulfinate Esters and Sulfoxides. Synthesis of Sulforaphane
摘要:
Reaction of the chiral auxiliary trans-2-phenylcyclohexanol (1) with thionyl chloride afforded a nearly equal mixture of two diastereomeric chlorosulfite esters (6); Treatment of this mixture with an equivalent amount of a dialkylzinc reagent (Me, et, i-Pr) afforded high levels of conversion of both chlorosulfite esters to (mainly) a single diastereomer of the sulfinate ester (7). Levels of absolute stereochemical induction ranged from 10:1 to 96:4 under conditions affording high chemical yields. The method was employed for the separate synthesis of both enantiomers of sulforaphane (13).
Asymmetric Synthesis of Chiral Sulfinate Esters and Sulfoxides. Synthesis of Sulforaphane
摘要:
Reaction of the chiral auxiliary trans-2-phenylcyclohexanol (1) with thionyl chloride afforded a nearly equal mixture of two diastereomeric chlorosulfite esters (6); Treatment of this mixture with an equivalent amount of a dialkylzinc reagent (Me, et, i-Pr) afforded high levels of conversion of both chlorosulfite esters to (mainly) a single diastereomer of the sulfinate ester (7). Levels of absolute stereochemical induction ranged from 10:1 to 96:4 under conditions affording high chemical yields. The method was employed for the separate synthesis of both enantiomers of sulforaphane (13).
frontier in the development of chiral stationary phases for chromatographic enantioseparation involves homochiral metal–organic frameworks (MOFs). Using enantiopure (R)-2,2′-dihydroxy-1,1′-binaphthalene-6,6′-dicarboxylic acid as a starting material, we prepared three homochiral MOFs that were further used as chiral stationary phases for high-performanceliquidchromatography to separate the enantiomers