in N,N-dimethyl-formamide 6 h; Heating;

1: 70 percent / dimethylformamide / 6 h / Heating 2: 95 percent / 2.5 M NaOH / ethanol / 24 h / Heating View Scheme

(i) EtMgBr, Et2O, benzene, (ii) /BRN= 1900390/; Multistep reaction;

1: 70 percent / dimethylformamide / 6 h / Heating 2: 95 percent / 2.5 M NaOH / ethanol / 24 h / Heating 3: BH3 / tetrahydrofuran / 1 h / Ambient temperature 4: 1.) NaH4 / 1.) DMF, 2.) DMF View Scheme