Dimethylformamide → 7-Chloro-2-methyl-10-methylsulfanyl-4H-3-thia-4,9-diaza-benzo[f]azulene

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Reaction Steps

Stir 7-chloro-2-methyl-4,9-dihydro-3-thia-4,9-diaza-benzo[f]azulene-10-thione (59.1 g, 0.210 mol) and DMF (236.4 mL) under nitrogen for 15 minutes at ambient temperature. Add powdered potassium carbonate (61.1 g, 0.442 mol); stir 15 minutes at ambient temperature. Add iodomethane (26.2 mL, 0.421 mol) and stir 2.5 hours at ambient temperature. Add MTBE (591 mL) and stir 15 minutes at ambient temperature. Filter and rinse solids with MTBE (59.1 mL). Wash the organic filtrate with water (3×591 mL), then dry over sodium sulfate, filter and concentrate under reduced pressure to give 60.0 g (96.7%) of crude product. 1H NMR (500 MHz, DMSO-d6) δ 2.22 (s, 3H), 2.39 (s, 3H), 6.47 (d, 1H), 6.57 (d, 1H), 6.86 (d, 1H), 6.97(dd, 1H), 8.09 (bs, 1H). 13C NMR (100 MHz, DMSO-d6) δ 13.24, 14.70, 120.58, 120.62, 121.67, 125.64, 127.51, 127.52, 127.77, 141.65, 142.16, 153.99, 165.48.

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