反应详情

温度

25 °C

Compound 40 (15.1 g, 71.3 mmol), Pd/C (1.5 g, 5 wt %, 50% wet) and MeOH (150 mL) was charged to a pressure vessel then purged with nitrogen gas for 5 min. The vessel was sealed, pressurized to 1 bar with nitrogen gas then released three times. The same was repeated with hydrogen gas. After the third purge with hydrogen the vessel was charged with 3 hydrogen at a pressure of 3 bars. The reaction was agitated and a temperature of 25±5° C. was maintained for 14 hours after which time the reaction mixture was filtered through a pad of Celite 545 and the solvent removed to provide crude compound 41 (8.48 g) as a yellow solid. To this material was added acetonitrile (ACN; 150 mL) and the reaction heated to reflux at which time all of the solids dissolved. The mixture was then cooled to 25±5° C. and the white needles formed were collected, washed with cold ACN and dried to provide purified compound 41. 1H NMR (500 MHz, d6-DMSO): 8.05 (br s, 3H), 4.20 (d, J=3.2, 1H), 3.42-3.34 (m, 1H), 2.71-2.65 (m, 1H), 1.51-1.20 (m, 4H), 1.17 (d, J=6.5 Hz, 1H), 0.83 (t, J=7.6 Hz, 3H), 0.64-0.60 (m, 2H), 0.54-0.49 (m, 2H).

1. customthen purged with nitrogen gas for 5 min
2. customThe vessel was sealed
3. customAfter the third purge with hydrogen the vessel
4. additionwas charged with 3 hydrogen at a pressure of 3 bars
5. filtrationwas filtered through a pad of Celite 545
6. customthe solvent removed