反应详情

4-(4-Chloro-[1,2,5]thiadiazol-3-yl)-piperazine-1-carboxylic acid tert-butyl ester (10.0 g, 33 mmol), pyridin-4-yl-methanol (6.9 g, 63 mmol) and a solution of 1M potassium tert-butyl butoxide in tert-butyl alcohol (60.0 mL, 60 mmol) were combined and stirred at room temperature overnight. The reaction mixture is diluted with EtOAc and washed with H2O (3×), sat'd NaCl (1×), dried (Na2SO4), and concentrated in vacuo. The crude product is purified by column chromatography (4:1 hexanes:EtOAc, followed by 1:1 hexanes:EtOAc) to give 7.1 g (57%) of 4-[4-(pyridin-4-ylmethoxy)-[1,2,5]thiadiazol-3-yl]-piperazine-1-carboxylic acid tert-butyl ester. 1H NMR (CDCl3) 8.65 (d, 2H), 7.32 (d, 2H), 5.49 (s, 2H), 3.55 (m, 8H) 1.48 (s, 9H) ppm. LC-MS (MH+)=378.

1. washwashed with H2O (3×), sat'd NaCl (1×)
2. dry with materialdried (Na2SO4)
3. concentrationconcentrated in vacuo
4. customThe crude product is purified by column chromatography (4:1 hexanes:EtOAc, followed by 1:1 hexanes:EtOAc)