1: 89 percent / BF3*Et2O / 0.75 h / 60 °C 2: pyridine / 18 h / Ambient temperature 3: 1.) AgO, 2.) nitric acid / 1.) dioxan, 5 min, 2.) 5 min 4: 65 percent / KOH / methanol; H2O / 0.05 h / Ambient temperature View Scheme

1: 92 percent / Ag(II)O, HNO3 / acetone / 0.17 h 2: 80 percent / H2SO4 (10percent) / methanol / 24 h / Ambient temperature View Scheme