Cl.O1CCCCC1[O:8][CH2:9][C:10]1[CH:11]=[C:12]([C:16]2[NH:20][C:19](=[O:21])[O:18][N:17]=2)[CH:13]=[CH:14][CH:15]=1>O1CCCC1.[Cl-].[Na+].O>[OH:8][CH2:9][C:10]1[CH:11]=[C:12]([C:16]2[NH:20][C:19](=[O:21])[O:18][N:17]=2)[CH:13]=[CH:14][CH:15]=1Add 10% hydrochloric acid (100 ml) to a solution of 3-[3-(tetrahydro-pyran-2-yloxymethyl)-phenyl]-4H-[1,2,4]oxadiazol-5-one (4.50 g, 16.3 mmol) in tetrahydrofuran (0.1M) and stir. After 18 hours, pour reaction into brine and extract with ethyl acetate. Combine the organic layers, dry with sodium sulfate, filter and concentrate under reduced pressure to yield the title product as a white solid (3.10 g, 99%): 1H NMR (DMSO-d6) δ 4.57 (s, 2H), 7.55 (m, 2H), 7.67 (dt, 1H), 7.81 (m, 1H), 12.95 (bs, 1H).
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