Scheme 12. Synthesis of Pyrimidine-Containing Hexaaza-HBCs.
Reagents and conditions: (a)15 Co2(CO)8, dioxane, 115 °C, 24 h, under N2; (b) FeCl3, CH3NO2, 298 K, Ar bubbling, 72 h; (c) DDQ, MeSO3H or CF3SO3H, DCM.
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