反应详情

To a mixture of 1-[3-methyl-2-(3,3,5,5-tetramethylcyclohex-1-enyl)phenyl]piperazine (115 mg, 0.368 mmol) produced in Example (71c), propionaldehyde (0.079 mL, 1.1 mmol) and tetrahydrofuran (2 mL) was added sodium triacetoxyborohydride (246 mg, 1.1 mmol), followed by stirring for 1 hour and 30 minutes at room temperature. Saturated aqueous solution of sodium hydrogencarbonate was added to the reaction mixture and extraction was performed with ethyl acetate. The separated organic layer was washed with water and brine in that order and then dried over anhydrous sodium sulfate. The desiccant was filtered off and the filtrate was concentrated under reduced pressure. The resultant residue was purified by NH silica gel column chromatography (ethyl acetate/hexane) to give 124 mg of 1-[3-methyl-2-(3,3,5,5-tetramethylcyclohex-1-enyl)phenyl]-4-propylpiperazine as colorless crystals.

1. washThe separated organic layer was washed with water and brine in that order
2. dry with materialdried over anhydrous sodium sulfate
3. filtrationThe desiccant was filtered off
4. concentrationthe filtrate was concentrated under reduced pressure
5. customThe resultant residue was purified by NH silica gel column chromatography (ethyl acetate/hexane)