反应详情

A solution of N-L-leucyl-L-proline methyl ester hydrochloride (2.22 g, 8 mmol) and triethylamine (2.8 mL, 20 mmol) in DMF (50 mL) was stirred at room temperature for 15 min. Then, a solution of 3-chloromethyl-5-chloro-[1,2,4]thiadiazole (0.34 g, 2 mmol) in DMF (10 mL) and tetra-butylammonium bromide (100 mg) were added and the resulting mixture was stirred at room temperature for 24 h. The reaction mixture was quenched with water and extracted into ethyl acetate. The organic layer was washed with a saturated ammonium chloride solution, brine, dried (sodium sulfate), filtered and concentrated in vacuo. Purification by column chromatography on silica gel using a mixture of hexane and ethyl acetate (7/3, 6/4 and 1/1) afforded N-(3-chloromethyl-[1,2,4]thiadiazol-5-yl)-L-leucyl-L-proline methyl ester as a white foam, 0.49 g, 65.3% yield. 1H-NMR (CDCl3) δ7.56 (d, J=8.2 Hz, 1H, NHCH), 4.78 (m, 1H, NHCH), 4.60 (dd, J=8.5, 4.6 Hz, 1H, CHCO2), 4.46 (s, 2H, CH2Cl), 4.09 (m, 1H), 3.69-3.73 (m, 1H), 3.74 (s, 3H, OMe), 2.25-2.30 (m, 1H), 1.68-2.11 (m, 6H), 0.99-1.03 (2d, 6H, 2Me); MS (m/z) 375 (M+ +1), 357, 305, 246, 218, 162, 150, 130.

1. customThe reaction mixture was quenched with water
2. extractionextracted into ethyl acetate
3. washThe organic layer was washed with a saturated ammonium chloride solution, brine
4. dry with materialdried (sodium sulfate)
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customPurification by column chromatography on silica gel using
8. additiona mixture of hexane and ethyl acetate (7/3, 6/4 and 1/1)