1: 91 percent / CH3ONa / methanol / 0.5 h / Ambient temperature 2: 73 percent / TPP, DEAD, HN3 / benzene / 0.5 h / 60 °C 3: 1) LiAlH4 / 1) ether, 10 min, r.t., 2) pyridine, 3 h, r.t. 4: cationic exchanger (H(+)) / methanol / 24 h View Scheme

methanol; sodium methylate 2 h;