反应详情

2-(2-methyl-1,3-dioxolan-2-yl)acetaldehyde (320 mg, 2.459 mmol) and (3-bromo-5-nitro-4-pyridyl)hydrazine (286.4 mg, 1.229 mmol) were heated under reflux in ethanol (2.864 mL) overnight. The reaction mixture was concentrated in vacuo and the residue was partitioned between DCM and a saturated aqueous sodium hydrogen carbonate solution. Combined organic extract was dried over MgSO4 and concentrated in vacuo to leave 3-bromo-4-(5-methyl-1H-pyrazol-1-yl)-5-nitropyridine as a yellow oil. (200 mg, 85%). MS (ES+) 284.9.

1. concentrationThe reaction mixture was concentrated in vacuo
2. customthe residue was partitioned between DCM
3. extractionCombined organic extract
4. dry with materialwas dried over MgSO4
5. concentrationconcentrated in vacuo