Short-RInChIKey=SA-FUHFF-UHFFFADPSC-GAUNOMJAIR-UHFFFADPSC-NUHFF-NUHFF-NUHFF-ZZZ

2-Pyridinamine (600 mg, 6.38 mmol, 1.00 equiv) and 2-bromo-4,5-dimethoxybenzaldehyde (1.56 g, 6.38 mmol, 1.00 equiv) were dissolved in methanol (10 mL). 2-Isocyano-2-methylpropane (530 mg, 721 μL, 6.38 mmol, 1.00 equiv) and a 1M solution of perchloric acid in methanol (64.0 mg, 638 μL, 638 μmol, 1.00M, 0.100 equiv) were were added and the mixture was reacted at 21 °C for 3 d. Subsequently, the solvent was removed under reduced pressure.