反应条件
1.1: di(n-butyl)tin oxide / acetonitrile / 1 h / Reflux 1.2: 90 h / 22 °C 1.3: pH 2 2.1: 2,3,4-trimethylpyridine / butan-1-ol; toluene; ethanol / 20 - 105 °C 3.1: toluene; 1-methyl-pyrrolidin-2-one / 3.5 h / 20 - 110 °C / Inert atmosphere View Scheme