Sodium hydride → (s)-(-)-5,11-Dihydro-5-[1-(3,4-dimethoxyphenethyl)-2-pyrrolidinyl-methyl]dibenzo[b,e][1,4]oxazepine

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Reaction Steps

Sixty-percent sodium hydride (0.34 g, 8.6 mmols) was washed with petroleum ether, and then suspended in 30 ml of dimethyl sulfoxide. To the suspension were added 1.38 g (7.0 mmols) of 5,11-dihydrodibenzo[b,e][1,4]oxazepine. The mixture was stirred in a nitrogen atmosphere at room temperature for 30 minutes. To this reaction solution was added dropwise a solution of 1.8 g (6.3 mmols) of (R)-(-)-3-chloro-1-(3,4-dimethoxyphenethyl)piperidine [[α]D25 =-20.3° (c=0.9, ethanol)] in 5 ml of dimethyl sulfoxide, and the mixed solution was stirred at room temperature for 12 hours and at 40° C. for 4 hours. The reaction solution was poured into ice water, and extracted with ethyl acetate. The organic layer was washed with water and with a saturated aqueous solution of sodium chloride in this order, and dried. Subsequently, the solvent was distilled off under reduced pressure. The resulting residue was subjected to column chromatography, and eluted with a mixed solvent of ethyl acetate and hexane at a ratio of 1:5. This mixed solvent was distilled off under reduced pressure. Further, the thus-obtained residue was subjected to column chromatography, and extracted with a mixed solvent of chloroform and methanol at a ratio of 200:1. This mixed solvent was then distilled off under reduced pressure to give 0.85 g of (S)-(-)-5,11-dihydro-5-[1-(3,4-dimethoxyphenethyl)-2-pyrrolidinyl-methyl]dibenzo[b,e][1,4]oxazepine as a pale yellow oil in a yield of 30%.

Provenance & Evidence