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Reagents and conditions: (a)349 toluene-3,4-dithiol, K2CO3, DMF, 100 °C, 1 h; (b) 2-aminobenzenethiol, K2CO3, DMF, 130 °C, 1 h; (c)358 Na2S·9H2O, NMP, 195 °C, overnight; (d) (1) Se, sodium borohydride, EtOH, 0 °C, 40 min, (2) 180.3 in NMP, then 190 °C, overnight.
