3,4-dihydro-2H-pyran → HCID 90408309, compound

Participants

Reaction Steps

A solution of 3-bromo-5-fluorophenol (1.64 g, 8.59 mmol), 3,4-dihydro-2H-pyran (1.56 mL, 17.2 mmol) and PPTS (0.216 g, 0.859 mmol) in DCM (10 mL) was stirred for 16 h at rt. The reaction was concentrated in vacuo. The residual crude oil was purified by chromatography (SiO2) using a 0% to 20% EtOAc/hexane over 15 min to give the title compound (2.24 g, 8.14 mmol, 95% yield) as a clear oil. 1H NMR (CDCl3) δ: 7.05 (dd, J=2.8, 2.1 Hz, 1H), 6.90 (ddd, J=8.0, 2.2, 1.8 Hz, 1H), 6.77 (dt, J=10.6, 2.2 Hz, 1H), 5.41 (t, J=3.1 Hz, 1H), 3.91-3.81 (m, 1H), 3.72-3.58 (m, 1H), 2.05-1.92 (m, 1H), 1.92-1.82 (m, 2H), 1.81-1.58 (m, 3H); 19F NMR (CDCl3) δ: −110.28 (s); 13C NMR (CDCl3) δ: 164.22 (s), 162.24 (s), 158.78 (d, J=11.8 Hz), 122.41 (d, J=12.5 Hz), 115.88 (d, J=3.3 Hz), 112.33 (s), 112.13 (s), 103.42 (s), 103.22 (s), 96.67 (s), 61.97 (s), 30.05 (s), 25.01 (s), 18.39 (s).

Provenance & Evidence