反应详情

1-(4-Chloro-[1,2,5]thiadiazol-3-yl)-piperidine-4-carboxylic acid (7.99 g, 32 mmol), pyridin-4-yl-methanol (7.39 g, 68 mmol) and a solution of 1M potassium tert-butyl butoxide in tert-butyl alcohol (100 mL, 100 mmol) were combined and stirred at room temperature overnight. The reaction mixture is diluted with H2O (500 mL) and washed with EtOAc (3×). The aqueous phase is concentrated to ˜250 mL and acidified to pH 5-6 with conc'd HCl. The resulting solids are filtered, washed with H2O and dried under high vacuum to give 6.04 g (59%) of 1-[4-(pyridin-4-ylmethoxy)-[1,2,5]thiadiazol-3-yl]-piperidine-4-carboxylic acid. 1H NMR (DMSO-d6) 8.57 (d, 2H), 7.41 (d, 2H), 5.51 (s, 2H), 4.03 (m, 2H), 3.00 (m, 2H), 2.46 (m, 1H), 1.91 (m, 2H), 1.63 (m, 2H) ppm. LC-MS (M−)=319.

1. washwashed with EtOAc (3×)
2. concentrationThe aqueous phase is concentrated to ˜250 mL
3. filtrationThe resulting solids are filtered
4. washwashed with H2O
5. customdried under high vacuum