Phosphorus oxychloride → 4-Chloro-7-(2-chlorophenyl)-8-iodo-2-methylpyrazolo[1,5-a][1,3,5]triazine

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To a solution of 7-(2-chlorophenyl)-8-iodo-2-methyl-1H-pyrazolo[1,5-a][1,3,5]triazin-4-one (I-1A-1d; 1.00 g, 2.6 mmol) and diisopropylethylamine (0.68 ml, 3.8 mmol) in toluene (30 ml) at room temperature was added POCl3 (1.28 ml, 14 mmol), dropwise. The mixture was heated at reflux for 5 hours, cooled to room temperature, and then concentrated, in vacuo, to a viscous oil. The residue was then purified by passing through a plug of silica gel on a sintered glass funnel using 20% ethyl acetate in hexanes as eluant to provide I-1A-1e as a yellow solid (0.93 g, 89%): +APcI MS (M+1) 316.3; 1H NMR (400 MHz, CD2Cl2) δ 7.57 (d, J=7.9 Hz, 1H), 7.53-7.43 (m, 3H), 2.74 (s, 3H).

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