反应详情

温度

95 °C

To a solution of Intermediate 1 (1 g, 2.923 mmol) in 0.04 M PTSA solution in 1,4-Dioxane (20 mL) was added 3-amino-4-methylbenzamide (526 mg, 3.5076 mmol), and the mixture was stirred at 95° C. for 16 h. TLC showed completion of starting material. (TLC system: 10% Methanol/DCM, (Rf): 0.6). The reaction mixture was directly absorbed on silica gel and purified by column chromatography using 4% methanol/DCM as eluents. The resulting off-white solid was stirred in a mixture of DCM:EtOAc:Diethyl Ether (10 mL:10 mL:30 mL) for 10 min, then filtered and dried under vacuum to obtain 596 mg of the desired compound (44%). 1HNMR (400 MHz, DMSO-d6) δ 2.15 (s, 3H), 5.78-5.81 (dd, 1H, J=1.9, 10.0 Hz), 6.26-6.31 (dd, 1H, J=2.0, 17.0 Hz), 6.40-6.46 (dd, 1H, J=10.0, 16.9 Hz), 7.02-7.09 (m, 2H), 7.13-7.15 (d, 1H, J=7.5 Hz), 7.19-7.21 (dd, 1H, J=7.9 Hz), 7.32 (br s, 1H), 7.57-7.59 (dd, 1H, J=1.6, 7.6 Hz), 7.66-7.68 (d, 1H, J=8 Hz), 7.88-7.91 (d, 2H, J=11.4 Hz), 8.21 (s, 1H), 8.27 (s, 1H), 9.12 (br s, 1H) 10.3 (s, 1H). MS: m/z 457.3 (ES+, M+H).

1. customThe reaction mixture was directly absorbed on silica gel
2. custompurified by column chromatography
3. stirringThe resulting off-white solid was stirred in a mixture of DCM
4. waitEtOAc:Diethyl Ether (10 mL:10 mL:30 mL) for 10 min
5. filtrationfiltered
6. customdried under vacuum