Scheme 105. Stitching Thienannulations of Alkynyl-Substituted PDIs.
Reagents and conditions: (a)212 K2S, DMF, 170 °C, 12 h, 60%; (b) K2S, DMF, 40 °C, 1 h, 63%; (c) K2S, DMF, 105.5a: 80 °C, 2 days, 61%, 105.5b: 25 °C, 15 h, then 140 °C, 2 days, 79%.
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