反应条件
1.1: N-ethyl-N,N-diisopropylamine / dichloromethane / -10 °C 2.1: titanium tetrachloride / dichloromethane / 0.75 h / -40 °C 2.2: 19.5 h / -40 - -35 °C 3.1: acetic acid / dichloromethane / 1 h 3.2: 1 h / 0 °C 3.3: 1 h / 20 °C 4.1: toluene / 3 h / 90 °C 4.2: 14 h / 50 °C 5.1: hydrogenchloride; water; acetic acid; iron / ethanol / 0.5 h / 0 - 20 °C 6.1: sodium nitrite; sulfuric acid / N,N-dimethyl-formamide; water / 1.5 h / 0 °C 6.2: 0.42 h / 20 - 90 °C View Scheme
