反应详情

To a solution of 2-(3-azidopropyl)-5-(2,5-difluorophenyl)-2-phenyl-1,3,4-thiadiazole-3(2H)-carbothioamide (0.300 g, 0.717 mmol) in 10 mL of ethanol was added tert-butyl 3-bromo-4-oxopiperidine-1-carboxylate (0.239 g, 0.860 mmol) followed by DIEA (0.25 mL, 1.43 mmol). The mixture was allowed to stir overnight at reflux then treated with tert-butyl 3-bromo-4-oxopiperidine-1-carboxylate (100 mg) and stirred at reflux for a further 3 hrs. The cooled mixture was partitioned between saturated NaHCO3 solution (30 mL) and EtOAc (30 mL) and the aqueous layer was extracted with EtOAc (2×20 mL). The combined organic phases were washed with brine (20 mL) dried over Na2SO4 and concentrated in vacuo. The residue was purified by flash column chromatography (5-10% ethyl acetate/hexanes) to afford the desired product as a bright yellow foam (0.313 g, 73%).

1. temperatureat reflux
2. stirringstirred
3. temperatureat reflux for a further 3 hrs
4. customThe cooled mixture was partitioned between saturated NaHCO3 solution (30 mL) and EtOAc (30 mL)
5. extractionthe aqueous layer was extracted with EtOAc (2×20 mL)
6. washThe combined organic phases were washed with brine (20 mL)
7. dry with materialdried over Na2SO4
8. concentrationconcentrated in vacuo
9. customThe residue was purified by flash column chromatography (5-10% ethyl acetate/hexanes)