反应详情

To a solution of triphosgene (11.9 mg, 0.0400 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), 41.0 mg, 0.100 mmol) and DIEA (52 μL, 0.30 mmol) in 2 mL of THF under Ar. The resulting mixture was stirred at RT for 10 min and cooled to 0° C. 2-Amino-ethanol (60.0 μL, 1.00 mmol) was added into the mixture and the reaction was stirred at RT for 2 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 (2-8% MeOH/DCM) to give 15.1 mg (35%) of the title compound as a light yellow oil. 1H-NMR (CD3OD; 400 MHz): δ 8.11 (d, 1H, J=8.4 Hz), 7.99 (s, 1H), 7.31 (dd, 1H, J=8.4, 2.4 Hz), 7.21 (d, 1H, J=2.4 Hz), 6.48 (s, 1H), 5.80 (m, 1H), 3.52 (t, 2H, J=5.6 Hz), 3.16 (t, 2H, J=5.6 Hz), 2.20-2.33 (m, 4H), 1.73-1.88 (m, 4H), 1.60 (s, 6H). Mass spectrum (ESI, m/z): Calcd. for C23H28N6O3, 437.2 (M+H). found 437.1.

1. temperaturecooled to 0° C
2. stirringthe reaction was stirred at RT for 2 h
3. extractionextracted with EtOAc (2×25 mL)
4. concentrationThe combined organic layers were concentrated in vacuo
5. customthe residue was purified by flash chromatography on silica gel (2-8% MeOH/DCM)