反应详情

To a solution of triphosgene (7.2 mg, 0.024 mmol) in 2 mL of THF at 0° C. was added a solution of 4-cyano-1H-imidazole-2-carboxylic acid [4-(1-amino-1-methyl-ethyl)-2-cyclohex-1-enyl-phenyl]-amide acetic acid salt (as prepared in Example 3, step (b), 25.0 mg, 0.0611 mmol) and DIEA (32 μL, 0.18 mmol) in 2 mL of THF under Ar. The resulting mixture was stirred at RT for 20 min and cooled to 0° C. NH3 (g) was bubbled into the mixture for ca. 4 min and the reaction was then sealed and stirred at RT for 0.5 h. The mixture was treated with brine (10 mL) and extracted with EtOAc (2×25 mL). The combined organic layers were concentrated in vacuo and the residue was purified by flash chromatography on silica gel (3-6% MeOH/DCM) to afford 7.2 mg (30%) of the title compound as a white solid. 1H-NMR (CD3OD; 400 MHz): δ 8.11 (d, 1H, J=8.6 Hz), 7.98 (s, 1H), 7.32 (dd, 1H, J=8.6, 2.1 Hz), 7.22 (d, 1H, J=2.1 Hz), 5.80 (m, 1H), 2.20-2.34 (m, 4H), 1.73-1.89 (m, 4H), 1.61 (s, 6H). Mass spectrum (ESI, m/z): Calcd. for C21H24N6O2, 393.2 (M+H). found 393.0.

1. temperaturecooled to 0° C
2. customNH3 (g) was bubbled into the mixture for ca. 4 min
3. customthe reaction was then sealed
4. stirringstirred at RT for 0.5 h
5. additionThe mixture was treated with brine (10 mL)
6. extractionextracted with EtOAc (2×25 mL)
7. concentrationThe combined organic layers were concentrated in vacuo
8. customthe residue was purified by flash chromatography on silica gel (3-6% MeOH/DCM)