Water → 1-Methylpiperidine-4-methylamine

Temperatur

0 °C

1-Methylisonipecotamide (6.75 g, 47.5 mmoles) (prepared as described in Preparative Example 245, Step A above) was dissolved in anhydrous THF (350 mL) and the resulting mixture was added in portions to a stirred slurry of lithium aluminum hydride (1.8 g, 47.5 mmoles) in anhydrous THF (100 mL) at 0° C. under nitrogen. The mixture was stirred at 0° C. for 30 min and then heated at 66° C. for 25 h under nitrogen. Distilled water (1.88 mL) was added dropwise to the stirred mixture at 0° C., followed by 20% aqueous sodium hydroxide (1.42 mL) and then distilled water (6.75 mL) and the mixture was stirred for 15 min. The mixture was filtered and the solids were washed with THF and dichloromethane. The combined filtrates were evaporated to dryness and chromatographed on a silica gel column (30×5 cm) using 15%–20% (10% conc. ammonium hydroxide in methanol)-dichloromethane as the eluant to give 4-(aminomethyl)-1-methylpiperidine (0.678 g, 11%): FABMS: m/z 129.1 (MH+); HRFABMS: m/z 129.1389 (MH+). Calcd. for C7H17N2: m/z 129.1392; δH (d6-DMSO): 2.08 ppm (3H, S, —NCH3); δC (d6-DMSO): CH3: under DMSO peaks; CH2: 29.6, 29.6, 46.7, 55.2, 55.2; CH: 46.2.

1. temperatureheated at 66° C. for 25 h under nitrogen
2. filtrationThe mixture was filtered
3. washthe solids were washed with THF and dichloromethane
4. customThe combined filtrates were evaporated to dryness
5. customchromatographed on a silica gel column (30×5 cm)

ORD-Eintrag

ord-1d9204116c8645c0b693fb475a43fd22

Quelldatensatz

uspto-grants-2007_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07196078B2