Br[C:2]1[CH:7]=[CH:6][C:5]([Br:8])=[CH:4][N:3]=1.[OH:9][CH:10]1[CH2:15][CH2:14][NH:13][CH2:12][CH2:11]1.C([O-])([O-])=O.[K+].[K+]>C(O)C>[Br:8][C:5]1[CH:6]=[CH:7][C:2]([N:13]2[CH2:14][CH2:15][CH:10]([OH:9])[CH2:11][CH2:12]2)=[N:3][CH:4]=1A mixture of 2,5-dibromopyridine (100 mg, 0.42 mmol), 4-hydroxypiperidine (49 mg, 0.46 mmol) and K2CO3 (64 mg, 0.46 mmol) in ethanol (4 mL) was heated to 110° C. for 52 h. The crude reaction mixture was concentrated under reduced pressure to dryness and the residue was treated with water. Crude product was collected by vacuum filtration and purified by flash chromatography using EtOAc/hexanes (1:4 to 2:3) to give the title compound as a white solid (533 mg, 41%). 1H NMR (400 MHz, CDCl3) δ 8.18 (d, J=2.2 Hz, 1H), 7.53 (dd, J=9.0, 2.3 Hz, 1H), 6.59 (d, J=9.0 Hz, 1H), 4.04-3.94 (m, 3H), 3.18 (t, J=11 Hz, 2H), 2.00-1.95 (m, 2H), 1.63-1.54 (m, 2H); MS ESI 256.9 [M+H]+, calcd for [C10H13BrN2O+H]+ 257.02.
読み込み中…
