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Reaction conditions: (a) 1) potassium ethylxanthate, DMF, 140 °C, 4 h; 2) MeI, NEt3, EtOH, 80 °C, 1 h; (b) p-TsOMe, anisole, 125 °C, 4 h; (c) 3-ethyl rhodanine, NEt3, MeCN, 25 °C, 4 h; (d) p-TsOMe, DMF, 135 °C, 3 h; (e) 1) NEt3, MeCN, 70 °C, 3 h; 2) DCM/MeOH, aq. NH3, r.t., 1 h.
