反应详情

To a solution of 1.8 g of 6-chloro-4-methyl-3,4-dihydro-2H-1,4-benzothiazine-8-carboxylic acid in 30 ml of ethyl acetate was added 1.05 g of triethylamine, and then added 0.891 g of pivaloyl chloride dropwise with stirring at -10° C. to -5° C. followed by stirring the mixture at the same temperature for 30 minutes. To the resultant mixture was added a solution of 1.12 g of 3-aminoquinuclidine in 15 ml of ethyl acetate at -10° to -5° C. and then stirred at room temperature for an hour. After the reaction solution was washed with water, dried over anhydrous sodium sulfate and concentrated, the crystalline residue thus obtained was recrystallized from ethyl acetate to give 6-chloro-4-methyl-N-(3-quinuclidinyl)-3,4-dihydro-2H-1,4-benzothiazine-8-carboxamide as yellow crystals. Melting point: 195°-196° C.

1. stirringby stirring the mixture at the same temperature for 30 minutes
2. stirringstirred at room temperature for an hour
3. washAfter the reaction solution was washed with water
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated
6. customthe crystalline residue thus obtained
7. customwas recrystallized from ethyl acetate