Dimethylformamide → (2Z)-2-(5-amino-1,2,4-thiadiazol-3-yl)-2-methoxyiminoacetyl chloride

In 80.0 ml of acetonitrile, 10.0 g of 2-(5-amino-1,2,4-thiadiazol-3-yl)-2(Z)-methoxyiminoacetic acid were stirred at -20° C., followed by the dropwise addition of a chlorinating reagent, which had been prepared beforehand by gradually adding 8.4 g of phosphorus oxychloride at 5° C. to a mixture of 25 ml of acetonitrile and 4.0 g of N,N-dimethylformamide (DMF) and then reacting them for 30 minutes. After they were reacted for 5 minutes, 200 ml of ice water were poured into the reaction mixture to precipitate crystals. The crystals were collected by filtration, washed with 100 ml of ice water and then stirred for 30 minutes in 100 ml of n-hexane. After filtration, the resulting crystals were dried under reduced pressure, whereby the title compound was obtained. Yield: 8.90 g (81.6%). Purity: 97.9%.

1. additionfollowed by the dropwise addition of a chlorinating reagent, which
2. customhad been prepared beforehand
3. customfor 30 minutes
4. customAfter they were reacted for 5 minutes
5. customto precipitate crystals
6. filtrationThe crystals were collected by filtration
7. washwashed with 100 ml of ice water
8. filtrationAfter filtration
9. dry with materialthe resulting crystals were dried under reduced pressure, whereby the title compound
10. customwas obtained

ORD record

ord-6be2842cade74a07965584b849ce990d

Source dataset

uspto-grants-1995_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05428173