Ethanol → 2-[4-(4-Pyridinyl)piperazino]ethylamine

A stirred mixture of 2-[2-(4-pyridin-4-yl-piperazin-1-yl)-ethyl]-isoindole-1,3-dione (1.52 g, 4.52 mmol), ethanol (47.5 mL), water (2.5 mL) and hydrazine hydrate (98%, 0.438 mL, 9.04 mmol) was refluxed for 3 h, then cooled and diluted with diethyl ether (100 mL). The precipitated crystals were filtered off, washed with diethyl ether and filtrate was concentrated. The residue was dissolved N sodium hydroxide (25 mL), extracted with dichloromethane (4×25 mL), the combined organic layers were washed with brine (25 mL), dried over sodium sulfate, filtered and concentrated to yield 0.58 g (62%) of the title compound as a colorless oil.

1. temperaturewas refluxed for 3 h
2. temperaturecooled
3. filtrationThe precipitated crystals were filtered off
4. washwashed with diethyl ether and filtrate
5. concentrationwas concentrated
6. dissolutionThe residue was dissolved N sodium hydroxide (25 mL)
7. extractionextracted with dichloromethane (4×25 mL)
8. washthe combined organic layers were washed with brine (25 mL)
9. dry with materialdried over sodium sulfate
10. filtrationfiltered
11. concentrationconcentrated

ORD-Eintrag

ord-55f9490a13a146e2a0594283cc5b6c7b

Quelldatensatz

uspto-grants-2011_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08034827B2