反应详情

A solution of Intermediate 1 (1 g, 3.24 mmol) and 3-amino-4-methylbenzamide (584 mg, 3.89 mmol) in 0.08 M PTSA in 1,4-dioxane was heated to 90° C. for 48 h. TLC showed the completion of starting material (TLC system: 10% methanol/DCM, (Rf): 0.5). The reaction mixture was concentrated, quenched with water, and the precipitated solid was filtered and dried under vacuum. The crude solid was purified by silica gel column chromatography by using 3% methanol/DCM as eluents. The purified solid was further triturated with ether, filtered and dried under vacuum to get the title compound as an off-white solid (430 mg, 31%). 1HNMR (400 MHz, D6-DMSO) δ 2.17 (s, 3H), 5.78-5.81 (dd, 1H J=1.8, 10.1 Hz), 6.28-6.32 (dd, 1H J=1.8, 17 Hz), 6.43-6.50 (dd, 1H J=10.1, 17 Hz), 7.04-7.08 (m, 2H), 7.18-7.24 (m, 2H), 7.27 (br s, 1H), 7.52-7.54 (dd, 1H J=1.7, 7.9 Hz), 7.73-7.76 (m, 1H), 7.87 (br s, 1H), 7.92 (d, 1H), 8.03 (s, 1H), 8.39 (s, 1H), 8.62 (s, 1H), 10.19 (s, 1H). MS m/z: 423.5 (ES+, M+H).

1. concentrationThe reaction mixture was concentrated
2. customquenched with water
3. filtrationthe precipitated solid was filtered
4. customdried under vacuum
5. customThe crude solid was purified by silica gel column chromatography
6. customThe purified solid was further triturated with ether
7. filtrationfiltered
8. customdried under vacuum