Methanol → (+/-)-3,4-bis-cyclopropylmethoxy-N-[(1RS,2RS,5RS)-2-(3,4-dimethoxyphenyl)-5-hydroxycyclohexyl]benzamide

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반응 단계

7.2 g of (±)-3,4-bis-cyclopropylmethoxy-N-[(1RS,2RS)-2-(3,4-dimethoxyphenyl)-5-oxo-cyclohexyl]benzamide (compound C1) are dissolved in 550 ml of 1,2-dimethoxyethane and 34 ml of methanol and treated portionwise with 600 mg of sodium borohydride at room temperature. The reaction mixture is concentrated, the residue redissolved in ethyl acetate and extracted with water. The organic layer is dried using sodium sulfate, concentrated and the residue is chromatographed on silica gel using a mixture of petroleum ether/ethyl acetate/triethylamine in the ratio 6/3/1. 6.35 g of the title compound are obtained.

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