1.1: sodium hydroxide; N-benzyl-N,N,N-triethylammonium chloride / toluene; water / 2.5 h / 39 °C 2.1: diisobutylaluminium hydride / dichloromethane / 1 h / -40 °C 2.2: 22 °C 3.1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 22 h / 20 °C 4.1: TEAHCO3; tetraethyl ammonium [18]F-fluoride / acetonitrile / 0.17 h / 90 °C View Scheme

1: KOH / diethyl ether / 3 h / 25 °C 2: KH / tetrahydrofuran / 14 h / Heating 3: 1M aq. HCl / tetrahydrofuran / 1 h / 25 °C View Scheme

1: 78 percent / DEAD, PPh3 / tetrahydrofuran / 1.) room temp., 2 h, 2.) 50 deg C, 16 h 2: tetrahydrofuran / 3 h / Ambient temperature; Irradiation 3: air View Scheme