1: 1.) pyridine, 2.) aq. KOH / 1.) 90 deg C, 6 h, 2.) acetone, RT, 2 h 2: H2SO4 / 6 h / 80 °C 3: H2 / 10percent Pd/C / ethanol / 8 h / Ambient temperature 4: Et3N / CH2Cl2 / 3 h / 10 °C 5: CH2Cl2 / 120 h / Ambient temperature View Scheme

1: H2SO4 / 6 h / 80 °C 2: H2 / 10percent Pd/C / ethanol / 8 h / Ambient temperature 3: Et3N / CH2Cl2 / 3 h / 10 °C 4: CH2Cl2 / 120 h / Ambient temperature View Scheme

1: H2 / 10percent Pd/C / ethanol / 8 h / Ambient temperature 2: Et3N / CH2Cl2 / 3 h / 10 °C 3: CH2Cl2 / 120 h / Ambient temperature View Scheme

1: Et3N / CH2Cl2 / 3 h / 10 °C 2: CH2Cl2 / 120 h / Ambient temperature View Scheme

in dichloromethane 120 h; Ambient temperature; Yield given;