Hydrazine hydrate (1:1) → tert-Butyl (4-aminobutoxy)carbamate

Temperature

80 °C

Hydrazine hydrate (1.0 ml, 20 mmol) was added to a solution of 2-(4-(tert-butoxycarbonylaminoxy)butyl)isoindole-1,3-dione (2.08 g, 6.22 mmol) in ethanol (8.0 ml). The reaction mixture was stirred at 80° C. for 65 h. The solvent was removed in vacuo. The residue was dissolved in toluene (10 ml) and the solvent was removed in vacuo. The residue was suspended in 1 N hydrochloric acid (10 ml). The precipitation was removed by filtration and was washed with water (2 ml). The filtrate and the wash-liquids were combined and made basic with potassium carbonate. The solution was extracted with dichloromethane (4×20 ml). The organic layer was dried over magnesium sulphate. The solvent was removed in vacuo to give 0.39 g of N-(4-aminobutoxy)carbamic acid tert-butyl ester. Potassium carbonate (3 g) was added to the aqueous phase, which was extracted with dichloromethane (3×20 ml). These combined organic layers were dried over magnesium sulphate. The solvent was removed in vacuo to give another 0.39 g of N-(4-aminobutoxy)carbamic acid tert-butyl ester.

1. customThe solvent was removed in vacuo
2. dissolutionThe residue was dissolved in toluene (10 ml)
3. customthe solvent was removed in vacuo
4. customThe precipitation
5. customwas removed by filtration
6. washwas washed with water (2 ml)
7. extractionThe solution was extracted with dichloromethane (4×20 ml)
8. dry with materialThe organic layer was dried over magnesium sulphate
9. customThe solvent was removed in vacuo

ORD record

ord-46c66449ca034e40b3f7ea982fd9428b

Source dataset

uspto-grants-2012_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08293708B2