1: 1.) t-BuLi, 2.) BF3*Et2O / 1.) n-pentane, THF, -78 deg C, 30 min, 2.) n-pentane, THF, , -78 deg C, 15 min 2: diethyl azodicarboxylate, Ph3P, diphenylphosphorazidate / tetrahydrofuran / -78 - 20 °C 3: H2 / 10percent Pd/C / ethanol / 2585.7 Torr View Scheme

1: diethyl azodicarboxylate, Ph3P, diphenylphosphorazidate / tetrahydrofuran / -78 - 20 °C 2: H2 / 10percent Pd/C / ethanol / 2585.7 Torr View Scheme

1: 1.) t-BuLi, 2.) BF3*Et2O / 1.) n-pentane, THF, -78 deg C, 30 min, 2.) n-pentane, THF, , -78 deg C, 15 min 2: diethyl azodicarboxylate, Ph3P, diphenylphosphorazidate / tetrahydrofuran / -78 - 20 °C 3: H2 / 10percent Pd/C / ethanol / 2585.7 Torr View Scheme