反应详情

3-Oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carboxylic acid (116 mg, 0.50 mmol, 1.0 eq) is added at room temperature to a stirred solution of trans-4-amino-cyclohexanecarboxylic acid methyl ester (80 mg, 0.50 mmol, 1.0 eq) in N,N-dimethylformamide (4 mL), followed by 1-hydroxybenzotriazole (74 mg, 0.55 mmol, 1.1 eq), N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (107 mg, 0.56 mmol, 1.15 eq) and N,N-diisopropylethylamine (192 μL, 1.12 mmol, 2.25 eq). After 15 hours stirring at room temperature, solvent is evaporated and the residue is extracted with dichloromethane (3×10 mL) and water (10 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to afford trans-4-[(3-oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carbonyl)-amino]-cyclohexanecarboxylic acid methyl ester as an off-white solid (127 mg, 66% yield).

1. customsolvent is evaporated
2. extractionthe residue is extracted with dichloromethane (3×10 mL) and water (10 mL)
3. dry with materialThe combined organic layers are dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated