反应详情

5.6 g (25 mmol) of trans-1-benzyl-3-hydroxy-4-methoxypyrrolidine and 8.6 g (33 mmol) of triphenylphosphine are initially introduced into 40 ml of absolute tetrahydrofuran and a solution of 6 g (34 mmol) of diethyl azodicarboxylate in 40 ml of absolute tetrahydrofuran is added dropwise at 0° C. 3.9 g (27 mmol) of phthalimide are then added in small portions at 0° C. in the course of one hour. The mixture is stirred at room temperature overnight and concentrated. The residue is dissolved in 80 ml of ethyl acetate and 80 ml of petroleum ether are added. The mixture is left to crystallize out overnight and the crystals (triphenylphosphine oxide and diethyl hydrazine-dicarboxylate) are filtered off. The filtrate is concentrated and the residue is heated under reflux with 60 ml of concentrated hydrochloric acid overnight. The undissolved residues are decanted and the solution is concentrated. The residue is taken up in a little water and the solution is rendered alkaline with solid potassium carbonate and extracted five times with 50 ml of chloroform. The extract is dried over potassium carbonate and concentrated and the residue is distilled.

1. concentrationconcentrated
2. dissolutionThe residue is dissolved in 80 ml of ethyl acetate
3. addition80 ml of petroleum ether are added
4. waitThe mixture is left
5. customto crystallize out overnight
6. filtrationthe crystals (triphenylphosphine oxide and diethyl hydrazine-dicarboxylate) are filtered off
7. concentrationThe filtrate is concentrated
8. temperaturethe residue is heated
9. temperatureunder reflux with 60 ml of concentrated hydrochloric acid overnight
10. customThe undissolved residues are decanted
11. concentrationthe solution is concentrated
12. extractionextracted five times with 50 ml of chloroform
13. dry with materialThe extract is dried over potassium carbonate
14. concentrationconcentrated
15. distillationthe residue is distilled