Phenol → Ethyl 3-(phenoxymethyl)imidazo[1,2-a]pyridine-2-carboxylate

HRID 1260022Notes

Reaction equation

[C:1]1([OH:7])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[H-].[Na+].Cl.Cl[CH2:12][C:13]1[N:17]2[CH:18]=[CH:19][CH:20]=[CH:21][C:16]2=[N:15][C:14]=1[C:22]([O:24][CH2:25][CH3:26])=[O:23].C(N(CC)CC)C>CN(C=O)C.O>[O:7]([CH2:12][C:13]1[N:17]2[CH:18]=[CH:19][CH:20]=[CH:21][C:16]2=[N:15][C:14]=1[C:22]([O:24][CH2:25][CH3:26])=[O:23])[C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1

Participants

Conditions

Temperature: 50 °C

Procedure

A solution of a mixture of phenol (2.20 g) and sodium hydride (95 wt %, 500 mg) in DMF (40 ml) was added dropwise to a solution of ethyl 3-(chloromethyl)imidazo[1,2-a]pyridine-2-carboxylate hydrochloride (3.5 g) in DMF (50 ml) at 0° C. Triethylamine (2.7 ml) was added at the same temperature over 30 min. The reaction mixture was stirred at 50° C. for 3 hr, and the reaction mixture was diluted with water and extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was subjected to silica gel column chromatography, and a fraction eluted with ethyl acetate-hexane (6:1) was concentrated under reduced pressure to give the object product (1.5 g).

Workup

extractionextracted with ethyl acetate
washThe extract was washed with saturated brine
dry with materialdried over anhydrous sodium sulfate
customThe solvent was evaporated under reduced pressure
washa fraction eluted with ethyl acetate-hexane (6:1)
concentrationwas concentrated under reduced pressure

Sources & evidence

ORD record: ord-b118d3020f6d4d2289d3cb7db4319708
Source dataset: uspto-grants-2013_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08466282B2

Reaction notes

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