1: 8.68 g / nBuLi; B(O-iPr)3 / tetrahydrofuran; hexane 2: p-TsOH*H2O / ethanol / 4 h / 20 °C 3: 6.09 g / pyridine / 20 °C View Scheme

1: 94 percent / p-TsOH*H2O / CH2Cl2 / 2 h / 20 °C 2: 8.68 g / nBuLi; B(O-iPr)3 / tetrahydrofuran; hexane 3: p-TsOH*H2O / ethanol / 4 h / 20 °C 4: 6.09 g / pyridine / 20 °C View Scheme

1: p-TsOH*H2O / ethanol / 4 h / 20 °C 2: 6.09 g / pyridine / 20 °C View Scheme

pyridine T=20°C;