Methanol → ethyl (Z)-3-(4-chlorophenyl)-3-(4-methanesulfonylphenyl)-2-(2-hydroxyethyl)-2-propenoate

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Reaction Steps

To a solution of 32.8 g (0.0775 mole) of (Z)-3-ethoxycarbonyl-4-(4-chlorophenyl)-4-(4-methanesulphonylphenyl)but-3-enoic acid, prepared in example 3, in 90 ml of anhydrous tetrahydrofuran are added dropwise 15.5 ml (0.155 mole) of borane/dimethyl sulphide complex. The mixture is stirred at room temperature for 8 hours and 23.5 ml of methanol are added dropwise. The mixture is evaporated to dryness in vacuo and the residue is dissolved in ethyl acetate. After washing with potassium carbonate solution, the organic phase is separated, dried over magnesium sulphate and evaporated in vacuo to give 30.8 g of ethyl (Z)-3-(4-chlorophenyl)-3-(4-methanesulphonylphenyl)-2-(2-hydroxyethyl)prop-2-enoate as crystals with a melting point of 128° C. after recrystallisation from isopropanol.

Provenance & Evidence