Water → 2-(3-azidopropyl)-5-(2,5-difluorophenyl)-3-(3-methyl-1H-1,2,4-triazol-5-yl)-2-phenyl-2,3-dihydro-1,3,4-thiadiazole

To a solution of methyl 2-(3-azidopropyl)-5-(2,5-difluorophenyl)-2-phenyl-1,3,4-thiadiazole-3(2H)-carbimidothioate (0.034 g, 0.079 mmol) in 1 mL pyridine was added acetohydrazide (0.017 g, 0.240 mmol). The mixture was warmed to 80° C. and stirred for 16 hours, then treated with acetohydrazide (0.050 g) and stirred at reflux for 40 hours. The cooled mixture was treated with water (10 mL) and extracted with EtOAc (3×10 mL). The combined organic phases were washed with water (10 mL) and brine (10 mL), then dried over Na2SO4 and concentrated in vacuo. The residue was purified by flash column chromatography (10-20% ethyl acetate/hexanes) to afford the desired product as a pale yellow solid, 0.010 g, 29%.

1. stirringstirred
2. temperatureat reflux for 40 hours
3. extractionextracted with EtOAc (3×10 mL)
4. washThe combined organic phases were washed with water (10 mL) and brine (10 mL)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated in vacuo
7. customThe residue was purified by flash column chromatography (10-20% ethyl acetate/hexanes)

ORD record

ord-ced5b85c205140aaa0104504b010acc2

Source dataset

uspto-grants-2015_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09221841B2