Cl[C:2]1[N:3]=[CH:4][C:5]([C:8]([OH:10])=[O:9])=[N:6][CH:7]=1.[O:11]1[CH2:14][CH2:13][CH:12]1[CH2:15][OH:16].CC(C)([O-])C.[K+]>CN(C)C=O>[O:11]1[CH2:14][CH2:13][CH:12]1[CH2:15][O:16][C:2]1[N:3]=[CH:4][C:5]([C:8]([OH:10])=[O:9])=[N:6][CH:7]=1In a microwave vial 5-chloropyrazine-2-carboxylic acid (100.0 mg, 0.631 mmol), dimethylformamide (5 mL), oxetan-2-ylmethanol (83.4 mg, 0.946 mmol) and potassium tert-butoxide (176.9 mg, 1.58 mmol) are added. A small exotherm is observed. After 1 minute at room temperature the vial is sealed and the mixture heated at 120° C. for 30 minutes in the microwave. The reaction mixture is then quenched with aqueous NH4Cl and the solvent evaporated under reduced pressure. The resultant residue is triturated in 2-propanol. The filtrate is concentrated under reduced pressure to give the title compound as a cream solid (0.294 g, 99%) and is used without further purification. ES/MS (m/e): 211.0 (M+1), 208.8 (M−H).
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