Potassium Carbonate → 5-[(Imidazo[1,2-A]pyridin-8-Yl)methoxy]-2-Methoxypyridine-4-Carbaldehyde

HRID 1471683Notes

Reaction equation

[OH:1][C:2]1[C:7]([CH:8]=[O:9])=[CH:6][C:5]([O:10][CH3:11])=[N:4][CH:3]=1.Cl[CH2:13][C:14]1[C:15]2[N:16]([CH:20]=[CH:21][N:22]=2)[CH:17]=[CH:18][CH:19]=1.C([O-])([O-])=O.[K+].[K+]>CN(C=O)C>[N:22]1[CH:21]=[CH:20][N:16]2[CH:17]=[CH:18][CH:19]=[C:14]([CH2:13][O:1][C:2]3[C:7]([CH:8]=[O:9])=[CH:6][C:5]([O:10][CH3:11])=[N:4][CH:3]=3)[C:15]=12

Participants

Conditions

Temperature: 125 °C

Procedure

A mixture of 5-hydroxy-2-methoxyisonicotinaldehyde (723.6 mg, 4.7 mmol), 8-(chloromethyl)-imidazol[1,2-a]pyridine (785 mg, 4.7 mmol), and K2CO3 (1.9 g, 14.1 mmol) in DMF (20 mL) was heated at microwave reactor at 125° C. for 15 min. The mixture was filtered and concentrated. The residue was purified on silica gel (50-100% EtOAc in hexanes) to give 5-(imidazo[1,2-a]pyridin-8-ylmethoxy)-2-methoxyisonicotinaldehyde (500 mg, 38%) as an off-white solid. 1H NMR (400 MHz; DMSO) δ=10.37 (s, 1H), 8.58 (d, 1H), 8.39 (s, 1H), 8.02 (s, 1H), 7.61 (s, 1H), 7.44 (d, 1H), 6.98 (s, 1H), 6.93 (t, 1H), 5.61 (s, 2H), 3.84 (s, 3H). LRMS (M+H+) m/z 284.0.

Workup

filtrationThe mixture was filtered
concentrationconcentrated
customThe residue was purified on silica gel (50-100% EtOAc in hexanes)

Sources & evidence

ORD record: ord-b99d7cf281554e0bb8e207f23bd5fa6f
Source dataset: uspto-grants-2015_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09012450B2

Reaction notes

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