Dichloromethane → HCID 20185731, compound

A mixture of 3-(N-hydroxyamino)propylphosphonic acid (1.64 g), bis(trimethylsilyl)acetamide (10 g) and dichloromethane (30 ml) was stirred at ambient temperature for 3 hours and cooled to 0°-5° C. To the mixture was added methylisothiocyanate (800 mg) under ice-cooling. The reaction mixture was stirred at the same temperature for an hour and concentrated under reduced pressure to give a residue. To this residue was added water (50 ml) and stirred at ambient temperature for 30 minutes. After the remaining dichloromethane was removed by evaporation under reduced pressure, an additional 50 ml of water was added. The aqueous solution was subjected to a column chromatography using activated charcoal. The column was washed with water (650 ml) and then the object compound was eluted with 70% aqueous acetone. The eluate was concentrated under reduced pressure to give crystals, which were separated by filtration, washed with ethanol and dried to give crystalline 3-[N-hydroxy-N-{(N-methyl)thiocarbamoyl}amino]propylphosphonic acid (320 mg). Further, the ethanol washing was concentrated under reduced pressure to give a residue which was pulverized to give the same object compound (450 mg). Mp 190°-194° C. (dec.).

1. temperaturecooled to 0°-5° C
2. temperaturecooling
3. stirringThe reaction mixture was stirred at the same temperature for an hour
4. concentrationconcentrated under reduced pressure
5. customto give a residue
6. stirringstirred at ambient temperature for 30 minutes
7. customAfter the remaining dichloromethane was removed by evaporation under reduced pressure
8. additionan additional 50 ml of water was added
9. washThe column was washed with water (650 ml)
10. washthe object compound was eluted with 70% aqueous acetone
11. concentrationThe eluate was concentrated under reduced pressure
12. customto give crystals, which
13. customwere separated by filtration
14. washwashed with ethanol
15. customdried

ORD record

ord-88827cb339e040eabb0c29a2204dc2c4

Source dataset

uspto-grants-1980_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04182758