1: 65 percent / pyridine / CH2Cl2 / 20 °C 2: cesium acetate / dimethylformamide 3: NBS*H2O 4: 65 percent / DIBAL-H / benzene; toluene 5: 87 percent / LiN(TMS)2 / tetrahydrofuran / -78 °C 6: 93 percent / BF3*OEt2 / dimethylsulfoxide 7: 71 percent / CH3SO3H / dimethylsulfoxide / 1.5 h / 20 °C 8: 54 percent / DCC; DMAP / tetrahydrofuran 9: 73 percent / TFA; water View Scheme