1: 5.75 g / NaOMe / benzene 2: pyridine 3: 67 percent / hydrogen, triethylamine / PtO2 / propan-2-ol 4: Michael condensation 5: 3.2 g / 20percent aq. KOH 6: 1.) ethyl chloroformate, triethylamine, 2.) sodium azide / 1.) acetone, 0 deg C, 30 min, 2.) H2O, 0 deg C, 1 h View Scheme

1: pyridine 2: 67 percent / hydrogen, triethylamine / PtO2 / propan-2-ol 3: Michael condensation 4: 3.2 g / 20percent aq. KOH 5: 1.) ethyl chloroformate, triethylamine, 2.) sodium azide / 1.) acetone, 0 deg C, 30 min, 2.) H2O, 0 deg C, 1 h View Scheme

1: 67 percent / hydrogen, triethylamine / PtO2 / propan-2-ol 2: Michael condensation 3: 3.2 g / 20percent aq. KOH 4: 1.) ethyl chloroformate, triethylamine, 2.) sodium azide / 1.) acetone, 0 deg C, 30 min, 2.) H2O, 0 deg C, 1 h View Scheme

1: 85 percent / alkaline hydrolysis 2: 1.) ethyl chloroformate, triethylamine, 2.) sodium azide / 1.) acetone, 0 deg C, 30 min, 2.) H2O, 0 deg C, 1 h View Scheme

1: 1.) ethyl chloroformate, triethylamine, 2.) sodium azide / 1.) acetone, 0 deg C, 30 min, 2.) H2O, 0 deg C, 1 h 2: toluene / 2 h / steam bath View Scheme

in toluene 2 h; steam bath; Yield given;

sodium azide; chloroformic acid ethyl ester; triethylamine 1.) acetone, 0 deg C, 30 min, 2.) H2O, 0 deg C, 1 h; Multistep reaction. Title compound not separated from byproducts;