[OH:1][CH:2]1[NH:6][C:5](=[O:7])[CH:4]=[CH:3]1.[CH2:8](O)[CH2:9][CH2:10][CH2:11][CH3:12]>>[CH2:8]([O:1][CH:2]1[NH:6][C:5](=[O:7])[CH:4]=[CH:3]1)[CH2:9][CH2:10][CH2:11][CH3:12]A mixture of 3 g of 1,5-dihydro-5-hydroxy-2H-pyrrol-2-one in 60 cm3 of n-pentyl alcohol and 1.5 g of Amberlite IR 120 H is heated to 50° C. for 3 hours. The temperature is allowed to return to the ambient, and after filtering, the solvent is distilled off under reduced pressure. The residue is distilled at 20° C. under 0.08 mbar. 3.8 g of the expected product is obtained, utilized as it is for the following stage.
Wird geladen…