反应详情

To a solution of (±)-2-(4-chlorophenyl)-3,4-dihydro-2H-1,4-benzothiazine (10.01 g, 0.038 mole) in pyridine (150 ml) is added (S)-N-(2-naphthalenesulfonyl)prolyl chloride (18.57 g, 0.057 mole), and the mixture is stirred at room temperature for 4 hours. To the reaction mixture is added ethyl acetate, and the mixture is washed with 5 % hydrochloric acid, water, aqueous sodium hydrogen carbonate solution, water and saline in this order, and the ethyl acetate layer is separated, dried over sodium sulfate and distilled to remove the solvent. The resulting caramel is subjected to silica gel column chromatography (hexane:ethyl acetate=5:1 - 3:1). From the fraction eluted first there is obtained (R)-2-(4-chlorophenyl)-4-[(S)-N-(2-naphthalenesulfonyl)prolyl]-3,4-dihydro-2H-1,4-benzothiazine (10.75 g, 51 %) as crystals. M.p. 147°-151° C.

1. washthe mixture is washed with 5 % hydrochloric acid, water, aqueous sodium hydrogen carbonate solution, water and saline in this order
2. customthe ethyl acetate layer is separated
3. dry with materialdried over sodium sulfate
4. distillationdistilled
5. customto remove the solvent
6. washFrom the fraction eluted first there