Dimethylformamide → [5-(3-Hydroxy-propyl)-pyridin-2-yl]-thiourea

Participants

Reaction Steps

3-(6-Amino-pyridin-3-yl)-propan-1-ol (7-3), 2.83 g (19.5 mmol) was stirred in 15 mL of anhydrous CH2Cl2 under Ar. Anhydrous DMF, 5 mL was added and the solution became homogeneous. Benzoylisothiocyanate (2.62 mL, 19.5 mmol) was added and after 2 h the reaction was concentrated in vacuo. To the residue was added 60 mL 1 M NaOH, and 120 mL THF and the resulting mixture was heated to reflux. After 2 h reaction was cooled to RT, and diluted with water (pH 9). The aqueous phase was extracted three times with EtOAc. The combined organic phases was dried over Na2SO4, filtered and concentrated. Purification by flash column chromatography (gradient: CH2Cl2 to 95:5 CH2Cl2/MeOH) to afford the pure titled compound. 1H NMR (DMSO-d6) δ10.57 (bs, 1H), 10.43 (bs, 1H), 8.80 (bs, 1H), 8.05 (d, 1H, J=2.3 Hz), 7.62 (dd, 1H, J=2.4, 8.6 Hz), 7.10 (d, 1H, J=8.7 Hz), 4.48 (t, 1H, J=3.0 Hz), 3.41 (m, 2H), 2.59 (t, 2H, J=6.9 Hz), 1.68 (m, 2H).

Provenance & Evidence