Scheme 24.
Suzuki-Miyaura cross-coupling of 74 with bis(pinacolato)diboron.
Reagents and conditions: (i) bis(pinacolato)diboron, PdCl2(dppf)KOAc, DMF, 80 °C; (ii) bromobenzaldehydes, Pd(PPh3)4, K3PO4, DMF, 80 °C.
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