2,5-Dimethoxytetrahydrofuran → 2-Fluoro-4-methyl-3-(1H-pyrrol-1-yl)pyridine

関与物質

反応手順

2-Fluoro-4-methylpyridin-3-amine (1.0 g, 7.93 mmol) and 2,5-dimethoxytetrahydrofuran (1.08 mL, 1.05 equiv.) were suspended in 3 mL of acetic acid and refluxed for 2 hours. The reaction was cooled down to room temperature. The solvents were removed and the residue was purified by silica gel chromatography (EtOAc/hexanes=1:8, Rf=0.3) to afford 1.0 g (72%) oil. 1H NMR (400 MHz, CDCl3) δ 8.10 (dd, J=0.8, 5.1 Hz, 1H), 7.17 (d, J=5.1 Hz, 1H), 6.74 (td, J=2.1, 0.9 Hz, 2H), 6.40 (t, J=2.1 Hz, 2H), 2.26 (s, 3H). 13C NMR (101 MHz, CDCl3) δ 160.2, 157.8, 149.6, 149.5, 145.5, 145.4, 123.80, 123.76, 122.1, 109.8, 17.29, 17.25. HRMS (m/z) calcd for C10H10FN2 (M+H) 177.0828. found 177.0827. Richards, et al. (2008) Bioorg. & Med. Chem. Lett. 18:4325-27.

情報源と証拠