1: 97 percent / KHCO3 / methanol / 96 h 2: 64 percent / NaH, 4 Angstroem molecular sieves / dimethylformamide / 1.5 h / 20 °C 3: O3 / CH2Cl2; methanol / 1 h 4: methanol / 0.67 h / Heating 5: <<(C6H5)3P>Cu>BH4 / CHCl3 / 4 h / Heating View Scheme

1: 97 percent / KHCO3 / methanol / 96 h 2: 64 percent / NaH, 4 Angstroem molecular sieves / dimethylformamide / 1.5 h / 20 °C 3: O3 / CH2Cl2; methanol / 1 h View Scheme

Multi-step reaction with 2 steps 1: 97 percent / KHCO3 / methanol / 96 h2: 64 percent / NaH, 4 Angstroem molecular sieves / dimethylformamide / 1.5 h / 20 °C