Multi-step reaction with 7 steps
1: 45 percent / Br2 / CH2Cl2 / 3 h / Ambient temperature
2: 1.) t-BuOK / 1.) DMF, RT, 15 min, 2.) DMF, RT, 6 h
3: 48 percent / dimethylformamide / 1.5 h / Heating
4: Ac2O, Et3N / 0.33 h / Heating
5: 83 percent / BH3*Me2S / tetrahydrofuran / 2 h / Ambient temperature
6: 98 percent / CBr4, PPh3 / CH2Cl2 / 1 h / 10 °C
7: 1.) CH3ONa / 1.) MeOH, RT, 15 min, 2.) MeOH, reflux, 5 h
With
carbon tetrabromide; dimethylsulfide borane complex; potassium tert-butylate; bromine; sodium methylate; acetic anhydride; triethylamine; triphenylphosphine;
In
tetrahydrofuran; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1021/jm970847e