反应详情

To a mixture of 3.00 g. of 5-nitro-2-furan-carboxylic acid and 2.06 ml. of thienyl chloride in 50 ml. ether is added 0.45 ml. of dimethyl formamide. The reaction mixture is stirred overnight, under nitrogen, at room temperature. The ether solution is then decanted and the solvent removed to yield 5-nitro-2-furancarboxylic acid chloride, which is then dissolved in 50 ml. ether at 0° . To this solution is added, under nitrogen, 2.06 g. of cyclopropanemethyl alcohol and 3.1 of pyridine. The reaction mixture is allowed to warm to room temperature and is stirred for six days. Ether and water is added to the reaction mixture, the ether layer is decanted, and the aqueous phase is extracted once with ether. The combined organic phases are washed with 2N sulfuric acid, sodium carbonate, water, saturated copper sulfate, and brine, dried over calcium sulfate and the solvent removed to give 3.36 g. of cyclopropanemethyl 5-nitro-2-furancarboxylate, melting point 78°-80°.

1. additionTo a mixture of 3.00 g
2. customThe ether solution is then decanted
3. customthe solvent removed