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Reagents and conditions: (a)239 dimethylthiocarbamoyl chloride, DABCO, DMF, rt, 30 min, then 75 °C, 2–17 h; (b) 240 °C, argon, 2–5 h; (c) t-BuOK, DMF, 140 °C, 21 h; (d) SiHCl3, Et3N, toluene, 120 °C, 61–72 h.
