反应详情

To a solution of 6-chloro-3-pyridazinecarboxylic acid (0.12 g, 0.76 mmol) in methylene chloride (15 ml) were added t-butylamine (0.21 ml, 2.0 mmol) and N,N-bis(2-oxo-3-oxazolidinyl)phosphinic chloride (0.24 g, 0.93 mmol), and stirred overnight. The reaction mixture was added to saturated aqueous NaHCO3 and extracted three times with ethyl acetate. The combined organic layers were washed with brine and dried over Na2SO4. The solvent was evaporated and the residue was purified by silica gel chromatography (hexane/ethyl acetate=2/1) to give the title compound (0.080 g; 49%).

1. extractionextracted three times with ethyl acetate
2. washThe combined organic layers were washed with brine
3. dry with materialdried over Na2SO4
4. customThe solvent was evaporated
5. customthe residue was purified by silica gel chromatography (hexane/ethyl acetate=2/1)