Boron trifluoride → 1-(1-Methyl-1h-imidazol-4-yl)cyclopropan-1-amine

1-Methyl-1H-imidazole-4-carbonitrile (0.5 g, 4.6 mmol, 1 eq) was dissolved in THF, and to which titanium isopropoxide (1.6 g, 5.6 mmol, 2.5 eq) was added dropwise over 15 minutes. The mixture was stirred for 15 minutes at room temperature, and then ethyl magnesium bromide (1.6 g, 11.5 mmol, 2.5 eq) was added at room temperature over 15 minutes. The reaction mixture was stirred for 1 h. BF3 etherate (0.8 g, 5.6 mmol, 2.2 eq) was added and the mixture stirred at room temperature for 1 h. 1 N NaOH solution was added to the mixture to bring the pH to 9-10. Reaction mass was filtered through celite and the filtrate washed with DCM. The organic mixture was concentrated and the residue purified by flash chromatography on silica gel using 10% chloroform/methanol. Yield: 0.6 g 1H NMR (400 MHz, CDCl3): δ 0.97 (t, J=3.4 Hz, 2H), 1.00 (t, J=3.4 Hz, 2H), 3.63 (s, 3H), 7.28 (s, 1H), 7.31 (s, 1H). LCMS: (ES+) m/z=138.2 (M+H).

1. stirringThe reaction mixture was stirred for 1 h
2. stirringthe mixture stirred at room temperature for 1 h
3. customReaction mass
4. filtrationwas filtered through celite
5. washthe filtrate washed with DCM
6. concentrationThe organic mixture was concentrated
7. customthe residue purified by flash chromatography on silica gel using 10% chloroform/methanol

ORD-Eintrag

ord-bce4c654af114925a0851333356355cb

Quelldatensatz

uspto-grants-2011_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07994171B2