2: 94 percent / iPr2NEt / Pd(PPh3)4 / tetrahydrofuran; methanol / 24 h / 60 °C / 1520 Torr 3: 94 percent / DIBAL-H / CH2Cl2 / -80 °C 4: 60 percent / O2, rose bengal / methanol / -80 °C / Irradiation View Scheme