Scheme 343. Synthesis of Diphenylborane-Fused Porphyrins.
Reagents and conditions: (a)640 BBr3, o-dichlorobenzene, 80 °C; (b) TFA/H2SO4/DCM, 0 °C; (c) PdCl2(PhCN)2, PhCN, 140 °C; (d) Cu(OAc)2, DCM/MeOH, rt; (e) Zn(OAc)2·2H2O, DCM/MeOH, rt.
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