Methanol → Methyl 8-aminooctanoate

Temperatur

-5 °C

To 15 ml methanol under nitrogen, stirred, at −5° C. was added thionyl chloride (0.80 ml) dropwise. After 5 minutes, 8-aminooctanoic acid (1.592 g, 10 mmol) was added. The reaction was stirred at −5° C. for 1 h, room temperature for 45 minutes, and 40° C. for 2.25 h. After heating, the reaction mixture was concentrated. The residue was taken up in chloroform/water (40 ml/25 ml) and basified to pH 9-10 using 1N NaOH. Layers were shaken, separated and the aqueous layer washed with water (2×30 ml). The combined organics were dried over Na2SO4 and filtered. The filtrate was concentrated in vac and dried to give the product as an oily solid (1.568 g, 90%); 1H NMR (400 MHz, DMSO-d6) δ1.17-1.33 (m, 8H), 1.43-1.52 (m, 2H), 2.26 (t, J=7.5Hz, 2H), 2.44-2.49 (m, 2H), 3.55 (s, 3H); IR (film) 3475, 2930, 2850, 1730 cm−1; mass spectrum [EI], m/z 173 M+.

1. wait40° C. for 2.25 h
2. temperatureAfter heating
3. concentrationthe reaction mixture was concentrated
4. stirringLayers were shaken
5. customseparated
6. washthe aqueous layer washed with water (2×30 ml)
7. dry with materialThe combined organics were dried over Na2SO4
8. filtrationfiltered
9. concentrationThe filtrate was concentrated in vac
10. customdried

ORD-Eintrag

ord-eeb85ccec7c0406db7e3b835050ebb0a

Quelldatensatz

uspto-grants-2001_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06214877B1