Scheme 21.
Suzuki-Miyaura cross-coupling of 67 and subsequent dehydrogenation of 68.
Reagents and conditions: (i) ArB(OH)2 (2.2 equiv.), PdCl2(PPh3)2, Xphos, K2CO3, DMF-water (4/1, v/v), 120 °C, 2 h; (ii) I2 (2 equiv.), ethanol, reflux, 2 h.
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