Benzylamine → 5-Benzyl-5-azaspiro[2.4]heptane-4,7-dione

Temperature

0 °C

Ethyl 1-acetylcyclopropanecarboxylate (6.4273 g, 41.153 mmol) was dissolved in 46 mL of EtOH. Bromine (2.32 mL, 45.2683 mmol) was slowly added to the solution. The resulting reaction mixture was stirred for 2 h, then concentrated in vacuo. The crude residue was dissolved in 46 mL of EtOH and the mixture was cooled to 0° C. with an ice water bath. To this solution was slowly added benzyl amine (11.2 mL 102.8825 mmol) and the reaction mixture was stirred at room temperature overnight, then concentrated in vacuo to dryness. The residue was dissolved in CH2Cl2 (200 mL) and 1N aq HCl (100 mL). The phases were separated, and the aqueous phase was extracted with CH2Cl2 (100 mL), the combined organic phase was dried over anhydrous MgSO4, filtered, and concentrated in vacuo. Purification by chromatography on silica gel using an eluting system of hexane/EtOAc (60:40) provided 5-(phenylmethyl)-5-azaspiro[2.4]heptane-4,7-dione (2.4283 g 27%) as an orange solid. LCMS: (M+H)+: not detected.

1. customThe resulting reaction mixture
2. concentrationconcentrated in vacuo
3. dissolutionThe crude residue was dissolved in 46 mL of EtOH
4. stirringthe reaction mixture was stirred at room temperature overnight
5. concentrationconcentrated in vacuo to dryness
6. dissolutionThe residue was dissolved in CH2Cl2 (200 mL)
7. customThe phases were separated
8. extractionthe aqueous phase was extracted with CH2Cl2 (100 mL)
9. dry with materialthe combined organic phase was dried over anhydrous MgSO4
10. filtrationfiltered
11. concentrationconcentrated in vacuo
12. customPurification by chromatography on silica gel using an eluting system of hexane/EtOAc (60:40)

ORD record

ord-eef0ee8013b54c469cc442c4e4f718be

Source dataset

uspto-grants-2011_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07893056B2