反应详情

A solution of 3-(6-(methoxycarbonyl)-3,3-dimethyl-1,2,3,4-tetrahydroquinolin-2-yl)benzoic acid (150 mg, 0.44 mmol) and 1,1′-carbonyldiimidazole (214 mg, 1.32 mmol) in tetrahydrofuran (3 mL) was heated to 60° C. for 2 h, then was cooled to room temperature and treated with methanesulfonamide (54.2 mg, 0.57 mmol, 1.3 eq.). After stirring for 10 min, the reaction mixture was treated with dropwise addition of a solution of 1,8-diazabicyclo[5.4.0]undec-7-ene (221 mg, 1.45 mmol) in tetrahydrofuran (1 mL). Upon completion of addition, the resultant mixture was stirred overnight. Thin layer chromatography (petroleum ether:ethyl acetate=1:1) showed the reaction was complete. The reaction mixture was quenched with brine and acidified with 1N hydrochloric acid solution to pH=5, extracted with ethyl acetate (twice). The combined organic layers were washed with brine for 3 times, dried over anhydrous sodium sulfate. Removal of the solvent in vacuo gave 205 mg of methyl 3,3-dimethyl-2-(3-(methylsulfonylcarbamoyl)phenyl)-1,2,3,4-tetrahydroquinoline-6-carboxylate as a white solid, which was purified by column chromatography (petroleum ether: ethyl acetate=2:1 to 1:1) to afford 58 mg of white solid, which was used in next step.

1. additionUpon completion of addition
2. customThe reaction mixture was quenched with brine
3. extractionextracted with ethyl acetate (twice)
4. washThe combined organic layers were washed with brine for 3 times
5. dry with materialdried over anhydrous sodium sulfate
6. customRemoval of the solvent in vacuo