تفاعل #338186

معادلة التفاعل

4-aminobutyraldehyde dimethyl acetal

1,1′-carbonyldiimidazole

DIPEA

benzyloxyamine hydrochloride

→

3-(4,4-dimethoxy-butyl)-1-(benzyloxy)-urea

المردود 74.1%

المذيبات

THF

ظروف التفاعل

المعالجة

1. 1
   تركيزThe mixture was concentrated under reduced pressure
2. 2
   workup.DISSOLUTIONthe residue was dissolved in DMF (50 mL)
3. 3
   تركيزthen concentrated under reduced pressure
4. 4
   workup.DISSOLUTIONThe residue was dissolved in EtOAc (200 mL)
5. 5
   غسيلthe solution was washed with brine (5×25 mL)
6. 6
   تجفيفdried (MgSO4)
7. 7
   تركيزconcentrated
8. 8
   أخرىPurification of the crude material by column chromatography on silica gel (4:1 hexanes-EtOAc followed by 100% EtOAc)

الإجراء التجريبي

To a solution of 4-aminobutyraldehyde dimethyl acetal (2.73 g, 20.5 mmol) in THF (50 mL) was added 1,1′-carbonyldiimidazole (3.39 g, 20.9 mmol) and the resultant mixture was stirred at room temperature for 45 minutes. The mixture was concentrated under reduced pressure and the residue was dissolved in DMF (50 mL) and treated with DIPEA (18 mL, 103 mmol) and benzyloxyamine hydrochloride (10.2 g, 64.0 mmol). The mixture was heated at 60° C. overnight then concentrated under reduced pressure. The residue was dissolved in EtOAc (200 mL) and the solution was washed with brine (5×25 mL), dried (MgSO4), and concentrated. Purification of the crude material by column chromatography on silica gel (4:1 hexanes-EtOAc followed by 100% EtOAc) provided 4.29 g (73%) of 3-(4,4-dimethoxy-butyl)-1-(benzyloxy)-urea as a yellow oil.

المصدر