반응 #44199

반응 방정식

Cyanogen bromide

4-(4-bromo-2-fluorophenylamino)-5-fluoro-1-methyl-6-oxo-1,6-dihydropyridine-3-carboxylic acid hydrazide

cyanogen bromide

NaHCO3

→

desired product

수율 89.2%

5-(5-amino-[1,3,4]oxadiazol-2-yl)-4-(4-bromo-2-fluorophenylamino)-3-fluoro-1-methyl-1H-pyridin-2-one

수율 89.2%

용매

water

dioxane

반응 조건

후처리

1. 1
   workup.WAITAfter 19 hours
2. 2
   추출extracted with ethyl acetate
3. 3
   세척The combined organic extracts were washed with brine
4. 4
   건조dried (MgSO4)
5. 5
   농축concentrated under reduced pressure
6. 6
   기타Crystallization (MeOH:THF)

실험 절차

Cyanogen bromide (36 mg, 0.31 mmol) was added to a suspension of 4-(4-bromo-2-fluorophenylamino)-5-fluoro-1-methyl-6-oxo-1,6-dihydropyridine-3-carboxylic acid hydrazide (63 mg, 0.169 mmol) in dioxane (2 mL) followed by an aqueous NaHCO3 (2 mL of a 0.09 M solution) solution. After 17 hours, additional cyanogen bromide (14 mg) was added. After 19 hours, the reaction mixture was diluted with water and extracted with ethyl acetate. The combined organic extracts were washed with brine, dried (MgSO4) and concentrated under reduced pressure. Crystallization (MeOH:THF) followed by trituration (Et2O:MeOH 5:1) gave clean desired product as a white solid (60 mg, 89%). MS APCI (+) m/z 398, 400 (M+, Br pattern) detected; 1H NMR (400 MHz, CD3OD) δ 8.06 (s, 1H), 7.37 (d, 1H), 7.31 (d, 1H), 7.10 (td, 1H), 3.64 (s, 3H).

출처