1.1: 2.42 g / K2CO3 / acetonitrile / Heating 2.1: 70 percent / TBAF*3H2O / PdCl2(PPh3)2 / 60 °C 3.1: 67 percent / 1,3-bis(2,6-diisopropylphenyl)imidazolium chloride; t-BuOK / Pd(OAc)2 / toluene / Heating 4.1: BBr3 / CH2Cl2 / 16 h / -78 - 20 °C 4.2: 81 percent / KHCO3 / CH2Cl2; methanol / 1 h / 0 - 20 °C 5.1: 78 percent / NaH / dimethylformamide / 20 °C 6.1: CH2Cl2 / 2 h / 20 °C 6.2: 75 percent / 1,1,1,3,3,3-hexamethyldisilazane / CH2Cl2 / 20 °C View Scheme