N-bromosuccinmide; β-cyclodextrin in acetone T=20°C; 0.5 h;

silica-supported prop-1-ylsulfonic acid in methanol

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

1: 1.) Mg; 2.) Se / tetrahydrofuran 2: PPTS / methanol 3: (CF3CO)2O, DMSO / CH2Cl2 View Scheme

n-butyllithium; tri-isopropoxy-borane in tetrahydrofuran; hexane

Multi-step reaction with 4 steps 1: 68 percent / n-butyllithium / diethyl ether / 1.) rt, 1 h, 2.) 0 - 4 deg C, 4 h2: 79 percent / n-BuLi / diethyl ether / 1.) r.t, 1 h, 2.) 0 - 5 deg C, 3 h3: 90 percent / p-TsOH / ethanol / 4 h / Heating4: 87 percent / MnO2 / acetone / 1 h / Ambient temperature