反应详情

In 30.0 ml of tetrahydrofuran (THF), 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 6.97 g of oxalyl chloride at 5° C. to a mixture of 100 ml of THF and 4.0 g of N,N-dimethylformamide (DMF) and then reacting them for 30 minutes. After they were reacted for 5 minutes, the reaction mixture was poured into 250 ml of ice water to precipitate crystals. The crystals were collected by filtration and washed with 100 ml of ice water. The resulting crystals were thereafter suspended in water and the suspension was adjusted to pH 4.0 with a 1M aqueous solution of sodium acetate. The resulting solution was extracted with 250 ml of ethyl acetate. The organic layer was dried over magnesium sulfate, followed by filtration. The filtrate was concentrated and, under reduced pressure, was then dried, whereby the title compound was obtained. Yield: 7.5 g (68.7%). Purity: 98.7 %.

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. extractionThe resulting solution was extracted with 250 ml of ethyl acetate
9. dry with materialThe organic layer was dried over magnesium sulfate
10. filtrationfollowed by filtration
11. concentrationThe filtrate was concentrated and, under reduced pressure
12. customwas then dried