反应详情

A solution of 0.821 g of 1-(4-bromo-phenyl)-3-methyl-piperidine in tetrahydrofuran is cooled to −78° C. and treated with 0.3 g of 4-chloro-N-methoxy-N-methyl-3-sulfamoyl-benzamide. The mixture is stirred for 10 min and treated slowly with 4.31 mL of a solution of tert-butyl lithium (1.5 M) in tetrahydrofuran (3 mL). The orange solution is stirred at −78° C. for 15 min then at 0° C. for 1 hour. The reaction mixture is quenched with saturated aqueous ammonium chloride (100 mL) and extracted with ethyl acetate (2×50 mL). The organics are washed with water, a saturated sodium chloride solution, dried over sodium sulfate, filtered and concentrated in vacuo. The residue is loaded on Celite and purified by silica gel chromatography (1:1 hexanes/ethyl acetate) to give 2-chloro-5-[4-(3-methyl-piperidin-1-yl)-benzoyl]-benzenesulfonamide as a light yellow syrup. MS (m/z): 393 (M+1). HPLC Reverse Phase (Nucleosil 100-5 C18, gradient 10→100% CH3CN in 5 min) room temperature=5.40 minutes.

1. stirringThe orange solution is stirred at −78° C. for 15 min
2. waitat 0° C. for 1 hour
3. customThe reaction mixture is quenched with saturated aqueous ammonium chloride (100 mL)
4. extractionextracted with ethyl acetate (2×50 mL)
5. washThe organics are washed with water
6. dry with materiala saturated sodium chloride solution, dried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. custompurified by silica gel chromatography (1:1 hexanes/ethyl acetate)