Scheme 4. Suzuki Miyaura cross coupling of 10x. (i) 1 equiv. BF3(OEt2), toluene, 60 °C, 1 h. (ii) Dried in vacuo, then Pd(PtBu3)2 (10 mol%), 4-iodo-fluorobenzene (1.1 eq.), THF, KOtBu (2.5 eq.) 20 °C, 18 h.
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