Multi-step reaction with 6 steps
1: 97 percent / p-toluenesulfonic acid / benzene / 7 h / Heating
2: 93 percent / NBS / 1,2-dichloro-ethane / 3 h / 0 °C
3: 1.) TMEDA, n-BuLi / 1.) THF, hexane, -78 deg C, 2 h, 2.) THF, hexane, -78 deg C, 1 h
4: 76 percent / CuO, CuCl2 / acetonitrile / 4 h / 40 °C
5: chiral oxazaborolidine, BH3*SMe2 / tetrahydrofuran; toluene / 2 h / -23 - 0 °C
6: imidazole / dimethylformamide / Ambient temperature
With
1H-imidazole; N-Bromosuccinimide; n-butyllithium; N,N,N,N,-tetramethylethylenediamine; dimethylsulfide borane complex; chiral oxazaborolidine; toluene-4-sulfonic acid; copper(II) oxide; copper dichloride;
In
tetrahydrofuran; 1,2-dichloro-ethane; N,N-dimethyl-formamide; toluene; acetonitrile; benzene;
DOI:10.1021/ja984250f