反应详情

2.44 g (30 mmol) of 37% aqueous formaldehyde solution are added to a solution of 1.5 g (17 mmol) of anhydrous piperazine and 2.03 g (34 mmol) of acetic acid in 18.7 ml of water. The mixture is stirred at 25° for 15 minutes, and then 7.48 g (30 mmol) of 6-(N-benzyloxycarbonylamino)hexanal are added thereto. The reaction mixture is heated under reflux for 2 hours and then cooled with ice-water and extracted twice with 50 ml of methylene chloride each time. The extracts are combined, washed twice with 25 ml of saturated sodium hydrogen carbonate solution each time and with 25 ml of saturated sodium chloride solution, dried and concentrated to dryness by evaporation. 6-(N-benzyloxycarbonylamino)-2-methylene-hexanal is obtained in the form of a yellowish liquid.

1. temperatureThe reaction mixture is heated
2. temperatureunder reflux for 2 hours
3. extractionextracted twice with 50 ml of methylene chloride each time
4. washwashed twice with 25 ml of saturated sodium hydrogen carbonate solution each time
5. dry with materialwith 25 ml of saturated sodium chloride solution, dried
6. concentrationconcentrated to dryness by evaporation