Nitric Acid → N-(2-nitrooxyethyl)-4-thiazolecarboxamide

Temperature

5 °C

Fuming nitric acid (12.8 ml) was added dropwise to acetic anhydride (27.4 ml) with stirring and ice-sodium chloride cooling at 10° C. for 1 minute, and the mixture was stirred for 10 minutes at the same temperature. Continuously, a solution of N-(2-hydroxyethyl)-4-thiazolecarboxamide (25.0 g) in dry chloroform (35 ml) was added dropwise thereto with stirring and cooling at 5° C. for 10 minutes and the mixture was stirred for 1 hour at the same temperature. The reaction mixture was poured into a mixture of sodium bicarbonate (100 g) and ice-water (1.0 kg) and then extracted with ethyl acetate. The extract was washed with a saturated aqueous solution of sodium chloride and dried over magnesium sulfate. The solvent was concentrated under reduced pressure and the residual solid was recrystallized from a mixture of diisopropyl ether and methanol (3:2) to give colorless crystals of N-(2-nitrooxyethyl)-4-thiazolecarboxamide (10.17 g).

1. stirringthe mixture was stirred for 10 minutes at the same temperature
2. stirringwith stirring
3. stirringthe mixture was stirred for 1 hour at the same temperature
4. extractionextracted with ethyl acetate
5. washThe extract was washed with a saturated aqueous solution of sodium chloride
6. dry with materialdried over magnesium sulfate
7. concentrationThe solvent was concentrated under reduced pressure
8. customthe residual solid was recrystallized from a mixture of diisopropyl ether and methanol (3:2)

ORD record

ord-78f4ec7e7e9b46149ae2d350fcc94258

Source dataset

uspto-grants-1990_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04923886