1: AlCl3 / CH2Cl2 / 0 °C 2: 95 percent / chiral oxazaborolidine prepared from (S)-α,α-diphenyl-2-pyrrolidinemethanol and Me3SiCH2B(OH)2, catecholborane / toluene / -78 °C View Scheme

1.1: dichloromethane / 0.5 h / 0 °C 1.2: 2 h / 0 °C 2.1: triethylamine / tetrahydrofuran / 0.08 h / 20 °C 2.2: 0.08 h / 20 °C View Scheme

1.1: trimethylsilyl trifluoromethanesulfonate / acetonitrile / 0.75 h / 0 °C 1.2: 0.75 h / 0 °C 1.3: 0.25 h 2.1: sodium hydroxide / tetrahydrofuran; water / 0.08 h / 20 °C 2.2: 0.08 h / 20 °C View Scheme

1: nitronium hexafluorophosphate / acetonitrile; nitromethane / 1 h / Ambient temperature 2: 50 percent / 200 °C View Scheme

1.1: trimethylsilyl trifluoromethanesulfonate / acetonitrile / 0.75 h / 4 °C / Inert atmosphere 1.2: 0.92 h / 4 °C / Inert atmosphere 2.1: tris-(dibenzylideneacetone)dipalladium(0); bis[2-(diphenylphosphino)phenyl] ether; sodium t-butanolate / toluene / 4 h / 65 - 70 °C / Inert atmosphere View Scheme

With  nitronium hexafluorophosphate in  acetonitrile 1 h;  Ambient temperature;