in tetrahydrofuran 0.5 h;

(i) iPrMgBr, Et2O, (ii) /BRN= 1361491/; Multistep reaction;

1: HCO2H / Heating 2: N2H4*H2O, KOH View Scheme

formic acid Heating;

formic acid 18 h; Inert atmosphereReflux;

1: 1.) HCOOH, 2.) H2O 2: 81 percent / hydroxylamine hydrochloride, sodium acetate trihydrate / H2O; methanol / 0.17 h / Heating 3: 95 percent / polyphosphoric acid / 0.5 h / 100 - 120 °C 4: 96 percent / 1M borane-tetrahydrofuran complex / tetrahydrofuran / 15 h / Heating View Scheme

1: 1.) HCOOH, 2.) H2O 2: 81 percent / hydroxylamine hydrochloride, sodium acetate trihydrate / H2O; methanol / 0.17 h / Heating 3: 95 percent / polyphosphoric acid / 0.5 h / 100 - 120 °C View Scheme