Chloroform → 3-Chloro-5-methyl-8-thia-4,6-diazatricyclo[7.4.0.0,2,7]trideca-1(9),2,4,6-tetraene

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To a 50 mL flask was added 5 (220 mg, 1 mmol) and 5 mL POCl3. The resulting mixture was refluxed for 2 h, and the solvent was removed under reduced pressure to afford a dark residue. To this was added 30 mL of CHCl3 and 300 mg of silica gel. The solvent was evaporated to afford a plug. Column chromatography of the plug with hexane: acetyl acetate=20:1 as eluent afford 192 g (81%) of 6 as a yellow solid: 1H NMR (DMSO-d6) δ 1.82 (m, 4H), 2.63 (s, 3H), 2.84 (m, 2H), 2.96 (m, 2H).

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