反应详情

A suspension of 26.7 g (0.096 mol) of 2-butyl-4-iodoimidazole-5-carboxaldehyde (prepared in Example 96 (i) and (ii)) and 28.01 g (0.203 mol) of dry potassium carbonate in 350 mL of dimethylformamide was stirred under argon for 20 minutes. Then 30 g (0.10 mol) of methyl 4-bromomethyl-2,3-dichlorobenzoate was added and the mixture was stirred at 80° C. for 1.5 hours. The reaction mixture was poured into water and extracted several times with ether. Filtration of the solid formed at the ether-water interface gave 19.35 g of product. The ether layer was washed 4 times with water, once with brine, and then concentrated under vacuum to give a solid. Recrystallization of the combined solids from methanol gave 32.55 g (68%) of product; mp 135°-173° C.

1. stirringthe mixture was stirred at 80° C. for 1.5 hours
2. extractionextracted several times with ether
3. filtrationFiltration of the solid
4. customformed at the ether-water interface