1: 93 percent / Li, ethylenediamine / 1 h / 50 °C 2: 1.) pyridine, p-toluenesulfonyl chloride, 2.) H2 / platinum oxide / 1a ) 5 deg C, 0.5 h, b ) RT, 40 h, 2.) ethyl acetate, RT, 2 h View Scheme