1: 1.) LDA / THF, -78 deg C 2: 85 percent / pyridine / CHCl3 / 5 h / 60 °C 3: 81 percent / PPh3, HCOOH, NEt3 / Pd(OAc)2 / tetrahydrofuran / 72 h / Ambient temperature 4: 1.) NaBH4, 2.) 10percent HCl / 1.) EtOH, r.t., 15 h; 2.) H2O, reflux, 5h View Scheme

1: 85 percent / pyridine / CHCl3 / 5 h / 60 °C 2: 81 percent / PPh3, HCOOH, NEt3 / Pd(OAc)2 / tetrahydrofuran / 72 h / Ambient temperature 3: 1.) NaBH4, 2.) 10percent HCl / 1.) EtOH, r.t., 15 h; 2.) H2O, reflux, 5h View Scheme

1: 1.) AlCl3, CS2, 2.) NaOH / 1.) reflux, 2.) H2O 2: 1.) LDA / THF, -78 deg C 3: 85 percent / pyridine / CHCl3 / 5 h / 60 °C 4: 81 percent / PPh3, HCOOH, NEt3 / Pd(OAc)2 / tetrahydrofuran / 72 h / Ambient temperature 5: 1.) NaBH4, 2.) 10percent HCl / 1.) EtOH, r.t., 15 h; 2.) H2O, reflux, 5h View Scheme

hydrogenchloride; sodium tetrahydroborate 1.) EtOH, r.t., 15 h; 2.) H2O, reflux, 5h; Yield given. Multistep reaction;