反应详情

To 0.4 g of trans 1-ethoxycarbonyl-2-ethoxycarbonyl-pyrrolidine-3-acetaldehyde in 5 ml anhydrous tetrahydrofuran under nitrogen, cooled to -78°, is added dropwise a solution of 1.17 g of methoxymethyl-triphenylphosphonium chloride in 15 ml of anhydrous tetrahydrofuran to which is added 1.55 ml of potassium tert-butoxide/tetrahydrofuran (1.6M). Solution is stirred at room temperature for 4 hours. 2N Hydrochloric acid (11 ml) is added and the mixture is stirred for 45 minutes. The solution is concentrated and then extracted with methylene chloride. The extract is dried over sodium sulfate, filtered, concentrated, and the residue is purified by flash chromatography using ethyl acetate/hexane (1:5 to 3:7) to yield trans 1-ethoxycarbonyl-2-ethoxycarbonylpyrrolidine-3-propionaldehyde.

1. stirringthe mixture is stirred for 45 minutes
2. concentrationThe solution is concentrated
3. extractionextracted with methylene chloride
4. dry with materialThe extract is dried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. customthe residue is purified by flash chromatography