反应详情

To a solution of (R)-tert-butyl 1-(4-(2-cyano-5-fluorobenzyl)-6-methyl-5-oxo-4,5-dihydro-1,2,4-triazin-3-yl)piperidin-3-ylcarbamate (20, 37 mg) in dichloromethane (1 mL) was added TFA (0.5 mL) and the mixture was stirred at RT for 1 h. The mixture was carefully neutralized with NaHCO3 (aq, saturated), and extracted with CH2Cl2 (10 mL×3). The combined extracts were dried over Na2SO4 and concentrated to give the crude product, which was purified by column chromatography on silica gel, and eluted with 92:6:2 dichloromethane-methanol-ammonia to provide (R)-2-((3-(3-aminopiperidin-1-yl)-6-methyl-5-oxo-1,2,4-triazin-4(5H)-yl)methyl)-4-fluorobenzonitrile (21). 1H NMR (400 MHz, DMSO, ppm): δ 7.96 (m, 1H), 7.36 (br, 1H), 7.29 (d, 1H), 5.23 (s, 2H), 3.15 (m, 3H), 2.72 (m, 2H), 2.23 (s, 3H), 1.78 (d, 1H), 1.64 (d, 1H), 1.47 (m, 1H), 1.12 (m, 1H). MS: m/z, 343 (100%, M+1);

1. extractionextracted with CH2Cl2 (10 mL×3)
2. dry with materialThe combined extracts were dried over Na2SO4
3. concentrationconcentrated
4. customto give the crude product, which
5. customwas purified by column chromatography on silica gel
6. washeluted with 92:6:2 dichloromethane-methanol-ammonia