反应详情

温度

-20 °C

To a −78° C. solution of 2-amino-1,3,4-thiadiazole (commercially available) (2.5 g, 24.72 mmol) in THF (200 mL, 0.1M) was added first n-butyllithium 1.6M hexanes (30.9 mL, 49.4 mmol) followed 15 min later by chlorotrimethylsilane (6.27 mL, 49.4 mmol). The temperature raised to −20° C. for 15 min and cooled back to −78° C. More n-butyllithium 1.6M hexanes (15.45 mL, 24.72 mmol) was added followed 15 min later by 3-pentanone (2.62 mL, 24.72 mmol). The solution was then warmed to rt (overnight). The reaction mixture was quenched with a saturated NH4Cl solution and THF was removed under vacuum. The aqueous phase was extracted with EtOAc (3×) and the combined organic layers were washed with brine, dried over MgSO4 and concentrated. The crude residue obtained was purified by column chromatography (100% EtOAc) to yield the title compound. 1H NMR (400 MHz, acetone-d6): δ 6.3 (bs, 2H), 4.4 (bs, 1H), 2.0-1.7 (m, 4H), 0.9 (t, 6H).

1. temperaturecooled back to −78° C
2. temperatureThe solution was then warmed to rt (overnight)
3. customThe reaction mixture was quenched with a saturated NH4Cl solution and THF
4. customwas removed under vacuum
5. extractionThe aqueous phase was extracted with EtOAc (3×)
6. washthe combined organic layers were washed with brine
7. dry with materialdried over MgSO4
8. concentrationconcentrated
9. customThe crude residue obtained
10. customwas purified by column chromatography (100% EtOAc)