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Synthesis of unsymmetrical tetrazines via Ag-mediated Pd-catalyzed Liebeskind-Srogl coupling. [a] ArB(OH)2 (1.9 equiv.), 60 °C, 20 h. [b] ArB(OH)2 (3 equiv.), 60 °C, 20 h. [c] ArB(OH)2 (3 equiv.), microwave 100 °C, 3 h. [d] Pd(dppf)Cl2 (30 mol%), Ag2O (5 equiv.), ArB(OH)2 (6 equiv.), microwave 100 °C, 3h.
