反应详情

A solution of 1-(4-benzyloxyphenyl)-2-(2,4-dichlorophenyl)-5-methyl-1H-imidazole-4-carboxylic acid, from Ex 1, Step 3 (3.38 g, 7.5 mmol) in 60 ml CH2Cl2 was added 3 drops of DMF followed by oxalyl chloride (1.3 ml, 14.9 mmol). The mixture was refluxed for 2 hours, cooled to room temperature and evaporated to dryness. The residue was dissolved in 50 ml CH2Cl2 and cooled to 0° C. Triethylamine (2.1 ml, 14.9 mmol) was added followed by 1-aminopiperidine (0.9 ml, 8.2 mmol) and the mixture was stirred at room temperature for 2 hours. Water (300 ml) was added, the mixture extracted with CH2Cl2 (3×100 ml), dried (Na2SO4), filtered and concentrated. Flash chromatography (silica, hexane:EtOAc 1:2, EtOAc) afforded 2.94 g (74%) of the title compound as a white solid.

1. temperatureThe mixture was refluxed for 2 hours
2. customevaporated to dryness
3. dissolutionThe residue was dissolved in 50 ml CH2Cl2
4. temperaturecooled to 0° C
5. extractionthe mixture extracted with CH2Cl2 (3×100 ml)
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated