tetrafluoroboric acid; IPy2BF4 in diethyl ether; dichloromethane T=20°C; Iodination;

1: 92 percent / Et3N / Pd(PPh3)2Cl2-CuI / 3 h / 0 - 20 °C 2: 65 percent / CuI / dimethylformamide / 2.5 h / 100 °C 3: 99 percent / bis(pyridine)iodonium(I) tetrafluoroborate; HBF4 / CH2Cl2; diethyl ether / 20 °C View Scheme

1: 65 percent / CuI / dimethylformamide / 2.5 h / 100 °C 2: 99 percent / bis(pyridine)iodonium(I) tetrafluoroborate; HBF4 / CH2Cl2; diethyl ether / 20 °C View Scheme