1: 90 percent / LiN3 / dimethylformamide / 2 h / Ambient temperature 2: 82 percent / Bu3SnH, AIBN / toluene / 1.5 h / Heating; via Staudinger reduction, too View Scheme

1.1: DBU / acetonitrile 2.1: pyridine 2.2: morpholine 3.1: 95 percent / Et3N*HF / tetrahydrofuran 4.1: 40 percent aq. CH3NH2 View Scheme

1: 95 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / dimethylformamide / 0.25 h / -30 °C 2: 73 percent / 1M tetrabutylammonium fluoride / tetrahydrofuran; CH2Cl2 / 0.5 h / Ambient temperature View Scheme

1: 90 percent / LiCl / hexamethylphosphoric acid triamide / 1 h / Ambient temperature 2: 84 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 0.17 h / Ambient temperature View Scheme