Triethylamine → 2-(4,5-Dibromo-6-oxopyridazin-1(6H)-yl)-N-(pyridin-4-ylmethyl)acetamide

2-(4,5-Dibromo-6-oxopyridazin-1(6H)-yl)acetic acid (1.48 g, 4.38 mmol) in tetrahydrofuran (30 mL) was mixed with N,N-dimethylformamide (1 drop) and oxalyl chloride (570 μL, 6.53 mmol) at room temperature and stirred at room temperature for 30 minutes. The solvent was removed by distillation, and the residue was dissolved in tetrahydrofuran (10 mL) and added dropwise to 4-picolylamine (538 μL, 5.22 mmol) and triethylamine (1.22 mL, 8.70 mmol) in tetrahydrofuran (20 mL) and stirred at room temperature for 30 minutes. After completion of the reaction, the reaction solution was mixed with water and extracted with chloroform three times, and the extract was dried over anhydrous magnesium sulfate and evaporated under reduced pressure. The resulting solid was washed with 2-propanol-hexane to give the desired product (572 mg, 33% yield).

1. customThe solvent was removed by distillation
2. dissolutionthe residue was dissolved in tetrahydrofuran (10 mL)
3. stirringstirred at room temperature for 30 minutes
4. customAfter completion of the reaction
5. extractionextracted with chloroform three times
6. dry with materialthe extract was dried over anhydrous magnesium sulfate
7. customevaporated under reduced pressure
8. washThe resulting solid was washed with 2-propanol-hexane

ORD-Eintrag

ord-d7528680d4874bf5ab02e9b23cf7c1d0

Quelldatensatz

uspto-grants-2013_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08440666B2