反应详情

温度

80 °C

Nitrogen was bubbled through a stirred solution of 5-bromo-N-methyl-N-(2,2,6,6-tetramethylpiperidin-4-yl)-1,3,4-thiadiazol-2-amine [Intermediate 4] (1 g, 3.00 mmol) and (4-chloro-2-methoxyphenyl)boronic acid (0.615 g, 3.30 mmol) in dioxane (20 mL). To this mixture was added Pd(PPh3)4 (0.173 g, 0.150 mmol) followed by a solution of Na2CO3 (0.954 g, 9.00 mmol) in water (5 mL). The reaction was heated at 80° C. for 18 hours. The reaction mixture was cooled to RT, diluted with EtOAc (150 mL) and washed with water (100 mL). The organic phase was separated, dried over MgSO4, and filtered. The filtrate was concentrated in vacuo to afford the crude product as a dark red/brown oil which solidified on standing. The crude material was purified by flash chromatography using an 80 g silica cartridge running a gradient of [2M NH3 in MeOH]/DCM to afford the title compound as an off-white solid (1.051 g, 89% yield). LC-MS: Rt 1.04 min; MS m/z 395.2 [M+H]+ [Method A]. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.09 (d, J=8.59 Hz, 1H), 7.32 (d, J=2.02 Hz, 1H), 7.15 (dd, J=8.59, 2.02 Hz, 1H), 4.35 (tt, J=12.38, 3.54 Hz, 1H), 3.97 (s, 3H), 2.98 (s, 3H), 1.60 (dd, J=11.87, 3.28 Hz, 2H), 1.41 (t, J=12.13 Hz, 2H), 1.27 (s, 1H), 1.21 (s, 6H), 1.08 (s, 6H).

1. temperatureThe reaction mixture was cooled to RT
2. washwashed with water (100 mL)
3. customThe organic phase was separated
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationThe filtrate was concentrated in vacuo
7. customto afford the crude product as a dark red/brown oil which
8. customThe crude material was purified by flash chromatography