1: 40.8 percent / K2CO3 / dimethylsulfoxide / 30 h / Ambient temperature 2: ethyl acetate; diisopropyl ether 3: 94 percent / 15percent HCl/dioxane / Ambient temperature 4: DCC / tetrahydrofuran / Ambient temperature 5: 1) tBuOK / 1) THF, -50 deg C, 20 min, 2) THF, -30 deg C, 20 min 6: ethyl acetate; diisopropyl ether / 3 h / Ambient temperature 7: H2 / Pd / methanol / 2 h / 760 Torr / Ambient temperature View Scheme

1: 40.8 percent / K2CO3 / dimethylsulfoxide / 30 h / Ambient temperature 2: ethyl acetate; diisopropyl ether 3: 94 percent / 15percent HCl/dioxane / Ambient temperature 4: DCC / tetrahydrofuran / Ambient temperature 5: 1) tBuOK / 1) THF, -50 deg C, 20 min, 2) THF, -30 deg C, 20 min View Scheme