Water → HCID 19070278, compound

Temperature

-70 °C

Ethyl 6,7-dihydro-5H-imidazo[2,1-b][1,3]thiazine2-carboxylate (2.12 g, 10 mmol) was dissolved in dry dichloromethane (40 ml) under argon and cooled to −70°. Diisobutylaluminium hydride (1.5M toluene, 12 ml, 18 mmol) was added below −68° C. and the reaction mixture stirred at −70° C. for 1 h. Water was added carefully and the cooling remove. The reaction mixture was stirred vigorously at ambient temperature for 15 minutes and Celite (2 g) added. The mixture was filtered through Celite, the filter bed washed with dichloromethane and water, the filtrate and the washings combined and evaporated to dryness under reduced pressure. The residue was evaporated from ethanol (2×) to give the title compound as a white solid (1.31 g, 78%); νmax (CH2Cl2) 1685, 1543 and 1453 cm−1; δH (250 MHz; CDCl3) 2.34-2.43 (2H, m), 3.20 (2H, t, J 6 Hz), 4.17 (2H, t, J 6 Hz), 7.58 (1H, s), 9.75 (1H, s).

1. temperaturecooled to −70°
2. customthe cooling remove
3. stirringThe reaction mixture was stirred vigorously at ambient temperature for 15 minutes
4. additionCelite (2 g) added
5. filtrationThe mixture was filtered through Celite
6. washthe filter bed washed with dichloromethane and water
7. customevaporated to dryness under reduced pressure
8. customThe residue was evaporated from ethanol (2×)

ORD record

ord-1a82f0b460ae44e985e9ac5bc50f4c6e

Source dataset

uspto-grants-2003_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06600035B1