Zirconium-catalyzed Nagata reaction for the synthesis of 2-aryl-1,3,2-aryldioxaborins via a mild three-component condensation of phenols, aldehydes, and boronic acid
作者:Hongchao Zheng、Dennis G. Hall
DOI:10.1016/j.tetlet.2010.06.035
日期:2010.8
of phenols with aldehydes promoted by 3,5-bis(trifluoromethyl)phenyl boronic acid, leading to the formation of 2-aryl-1,3,2-aryldioxaborins, was investigated and optimized. The reaction afforded the desired aryldioxaborins in good to excellent yields under mild conditions at room temperature. The electron-deficient boronic acid promoter was essential. Electron-rich phenols react faster, and both alkyl
研究并优化了ZrCl 4催化苯酚与3,5-双(三氟甲基)苯基硼酸促进的醛的邻羟基烷基化反应,并导致形成2-芳基-1,3,2-芳基二氧杂硼酸。该反应在室温下在温和条件下以良好至优异的产率提供了所需的芳基二氧杂硼酸。缺电子的硼酸促进剂是必不可少的。富电子的酚反应更快,烷基和芳基醛都是合适的底物。可以进一步精制所得的芳基二氧杂硼酸,以产生取代的水杨醇,2-乙氧基苯并二氢吡喃和2-取代的苯酚。