[N:1]1[O:2][N:3]=[C:4]2[CH:9]=[C:8]([C:10](=[O:21])[C:11]#[C:12][C:13]([CH3:20])([O:15][Si](C)(C)C)[CH3:14])[CH:7]=[CH:6][C:5]=12.CC1C=CC(S(O)(=O)=O)=CC=1>C(Cl)Cl.O>[N:1]1[O:2][N:3]=[C:4]2[CH:9]=[C:8]([C:10](=[O:21])[C:11]#[C:12][C:13]([OH:15])([CH3:14])[CH3:20])[CH:7]=[CH:6][C:5]=12To a stirred solution of 1-(benzo[c][1,2,5]oxadiazol-5-yl)-4-methyl-4-(trimethylsilyloxy)pent-2-yn-1-one (0.45 g, 1.490 mmol) in DCM (15 mL) was added p-TSA (0.341 g, 1.790 mmol) at RT and the reaction mixture was stirred for 3 h. The reaction mixture was then diluted with water (5 mL) and the layers were separated. The combined organic layers were washed with a saturated NaHCO3 solution and water, dried over Na2SO4, filtered, and then concentrated in vacuo to afford 1-(benzo[c][1,2,5]oxadiazol-5-yl)-4-hydroxy-4-methylpent-2-yn-1-one (0.3 g, 87%) as an oil.
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