1: 1) KHMDS, 2) trisyl azide / 1) THF, -78 deg C, 30 min, 2) THF, -78 deg C, 2 min 2: aq. LiOH, 30percent H2O2 / tetrahydrofuran; H2O / 1 h / 0 °C 3: H2 / 10percent Pd/C / ethyl acetate / 760 Torr / Ambient temperature View Scheme