Scheme 220. Synthesis of π-Extended Aza-BODIPYs.
Reagents and conditions: (a)417 CH3CO2NH4, EtOH, reflux; (b) (1) 2 equiv of Br2, DCM, rt, (2) 4-alkylphenylboronic acid, Pd(PPh3)4, Na2CO3, (3) Et3N, BF3·Et2O; (c) TfOH, DDQ, DCM, rt.
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