Methylorthoformate → 3-(8-bromo-4,5-dihydrobenzo[b]thieno[2,3-d]oxepin-2-yl)-4-(2-chlorophenyl)-4H-1,2,4-triazole

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A solution of crude 8-bromo-N-(2-chlorophenyl)-4,5-dihydrobenzo[b]thieno[2,3-d]oxepine-2-carbohydrazonamide (150 mg) was heated in a sealed vessel with methyl orthoformate at 90° C. for 3 h. The mixture was cooled to room temperature and concentrated to give a crude residue that was purified by flash column chromatography (10-100% ethyl acetate in hexanes) to give 273. 1H NMR (dmso-d6, 400 MHz) δ 8.89 (s, 1H), 7.84 (m, 2H), 7.75 (m, 1H), 7.66 (m, 1H), 7.46 (m, 2H), 7.28-7.23 (m, 2H), 6.66 (s, 1H), 4.23 (t, 2H), 3.02 (t, 2H). MS (ESI) 460.0

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