1: 92 percent / TiBr2(i-PrO2)2, (4R,5R)-α,α,α',α'-tetraphenyl-2,2-dimethyl-1,3-dioxolane-4,5-dimethanol, mol. sieves 4A / CH2Cl2 / 24 h / -78 °C 2: 95 percent / HCl / tetrahydrofuran / 2 h / Ambient temperature 3: H2, 10percent Pd-C / tetrahydrofuran; ethanol 4: n-Bu3SnH, AIBN / benzene / 4 h / Heating View Scheme

toluene-4-sulfonic acid in benzene Heating;

3-chloro-benzenecarboperoxoic acid in dichloromethane

1: 1.) LDA / 1.) THF, hexane, 0 deg C, 4 h, 2.) THF, hexane, 0 deg C, 1 h 2: 92 percent / p-TsOH*H2O / benzene / 2 h / Heating View Scheme

1: 1) LDA / 1) THF, hexane, -78 deg C, 5 min, 2) -78 deg, 30 min 2: 67 percent / m-chloroperbenzoic acid / CH2Cl2 / 0.5 h / 0 °C View Scheme

1: LDA View Scheme

lithium diisopropyl amide

lithium diisopropyl amide in tetrahydrofuran; hexane T=0°C; 0.25 h;

lithium diisopropyl amide in tetrahydrofuran; hexane Yields of byproduct given;