1.1: diisopropylamine; n-butyllithium / hexane; tetrahydrofuran / -78 - 60 °C 1.2: -78 - 20 °C 2.1: triethylamine; diphenyl phosphoryl azide / toluene / 1 h / 115 °C 3.1: isobutyramide / 20 °C 4.1: tetrabutyl ammonium fluoride / acetonitrile; tetrahydrofuran / 20 °C View Scheme

1.1: diisopropylamine; n-butyllithium / hexane; tetrahydrofuran / -78 - 60 °C 1.2: -78 - 20 °C 2.1: triethylamine; diphenyl phosphoryl azide / toluene / 1 h / 115 °C 3.1: isobutyramide / 20 °C 4.1: tetrabutyl ammonium fluoride / acetonitrile; tetrahydrofuran / 20 °C 5.1: pyridinium chlorochromate / dichloromethane / 18 h / 20 °C View Scheme