Furfurylamine → (4-Ethoxy-benzyl)-furan-2-ylmethyl-amine

4-Ethoxy benzaldehyde (5 g, 33 mmol) and furfuryl amine (4.2 g, 43 mmoL) in a mixture of methanol (50 mL), trimethylorthoformate (10 mL) and AcOH (1 mL) were stirred at room temperature, under an atmosphere of nitrogen for 16 hours. Sodium borohydride (1.4 g, 35 mmol) was added, in 4 portions, over a period of 30 minutes (exothermic reaction). The reaction was stirred for an additional 2 hours at room temperature. The solvent was removed under vacuum and the residue taken up in ethyl acetate (150 mL). The organic phase was washed with H2O (200 mL) and aqueous phase was back extracted with ethyl acetate (2×, 100 mL). The combined organic layers were concentrated and the residue was purified on silica gel (70% ethyl acetate in hexanes with ˜0.5% triethylamine) to afford N-(4-ethoxybenzyl)-1-(furan-2-yl)methanamine (6.1 g, 80%) as a clear oil. NMR (CDCl3, 400 MHz): δ 1.40 (t, J=7.2 Hz, 3H), 3.71 (s, 2H), 3.76 (s, 2H), 4.02 (q, J=7.2 Hz, 2H), 6.17 (d, J=4 Hz, 1H), 6.31 (m, 1H), 6.84 (d, J=8.8 Hz, 2H), 7.23 (d, J=8.8 Hz, 2H), 7.36 (m, 1H).

1. custom(exothermic reaction)
2. stirringThe reaction was stirred for an additional 2 hours at room temperature
3. customThe solvent was removed under vacuum
4. washThe organic phase was washed with H2O (200 mL) and aqueous phase
5. extractionwas back extracted with ethyl acetate (2×, 100 mL)
6. concentrationThe combined organic layers were concentrated
7. customthe residue was purified on silica gel (70% ethyl acetate in hexanes with ˜0.5% triethylamine)

ORD record

ord-2a81625d152b420db0f4b2b73daf1195

Source dataset

uspto-grants-2011_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07939671B2