Water → 6-[3-(4-Phenyl-1,2,3,6-tetrahydro-1-pyridyl)propyl]-6H-dibenzo[c,e]-1,2-thiazine 5,5-dioxide hydrogen oxalate

関与物質

反応条件

反応手順

A solution of 6H-dibenzo[c,e]-1,2-thiazine 5,5-dioxide (5.6 g) in dry N,N-dimethylformamide (10 cc) is added dropwise to a suspension of sodium hydride (0.72 g, 80% suspension in oil) in N,N-dimethylformamide (40 cc). After 30 minutes' stirring, a solution of 1-(3-chloropropyl)-4-phenyl-1,2,3,6-tetrahydropyridine (5.6 g) in N,N-dimethylformamide (20 cc) is added. The reaction mixture is heated to 100° C. for 30 minutes and to reflux for 30 minutes and is then cooled and poured into a mixture of water (300 cc) and ethyl acetate (300 cc). The organic phase is washed with water, is dried over magnesium sulphate and is concentrated to dryness under reduced pressure (2.7 kPa). The residue is chromatographed on a column of silica gel (0.2-0.063-mm particle size, 4-cm diameter, 50-cm height) and eluted with dichloromethane and then a mixture of dichloromethane and ethanol (98-2 and 96-4 by volume), 250-cc fractions being collected. Fractions 8 to 12 are combined and concentrated to dryness under reduced pressure (2.7 kPa). The residue is dissolved in boiling ethanol (200 cc). The hot solution is filtered and treated with a solution of oxalic acid (2 g) in ethanol (20 cc). After cooling, the crystals are filtered off, washed with ethanol and dried. 6-[3-(4-Phenyl-1,2,3,6-tetrahydro-1-pyridyl)propyl]-6H-dibenzo[c,e]-1,2-thiazine 5,5-dioxide hydrogen oxalate (7 g) is obtained, melting at 170° C. (dec.).

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