Hydroxyamine hydrochloride → 5-(4-Chlorobutyl)-4-hydroxyimino-2-methyl-2,3,4,5-tetrahydropyrrolo[2,3-e][1,2]thiazine 1,1-dioxide

A suspension of 145 mg (0.5 mmol) of Compound 17, 104 mg (1.5 mmol) of hydroxylamine hydrochloride and 123 mg (1.5 mmol) of sodium acetate in 15 ml of methanol was refluxed for 166 hours. The reaction mixture was concentrated under reduced pressure, followed by the addition of a half-saturated aqueous solution of potassium carbonate to the residue. The resulting mixture was extracted with chloroform (twice). The organic layer was washed with a saturated aqueous solution of sodium chloride, dried over anhydrous sodium sulfate, and then concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column (eluent: chloroform), whereby 69 mg of the title compound were obtained (yield: 45%).

1. temperaturewas refluxed for 166 hours
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. additionfollowed by the addition of a half-saturated aqueous solution of potassium carbonate to the residue
4. extractionThe resulting mixture was extracted with chloroform (twice)
5. washThe organic layer was washed with a saturated aqueous solution of sodium chloride
6. dry with materialdried over anhydrous sodium sulfate
7. concentrationconcentrated under reduced pressure
8. customThe residue was purified by chromatography on a silica gel column (eluent: chloroform)

ORD record

ord-db08462c4a00473f8cf6e94026b1625f

Source dataset

uspto-grants-2003_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06583296B2