A Mild Synthesis of Nitriles by von Braun Degradation of Amides Using Triphenyl Phosphite-Halogen-Based Reagents
作者:Fabio Prati、Daniele Vaccari、Paolo Davoli、Alberto Spaggiari
DOI:10.1055/s-2007-1072591
日期:2008.5
aromatic and aliphatic nitriles is disclosed. In the presence of bromotriphenoxyphosphonium bromide (TPPBr 2 ), N-alkyl and N, N-dialkyl amides undergo von Braun degradation to nitriles in good to excellent yields under the mildest conditions ever reported. The reaction proceeds via formation of an iminoyl bromide intermediate at -60 °C, which subsequently dealkylate upon refluxing in chloroform or even
公开了合成芳香族和脂肪族腈的温和程序。在溴化三苯氧基鏻 (TPBPr 2 ) 的存在下,N-烷基和 N, N-二烷基酰胺在有史以来报道的最温和条件下以良好到极好的产率经历冯布劳恩降解成腈。该反应通过在 -60 °C 下形成亚氨酰溴中间体进行,随后在氯仿中或什至在室温下回流时脱烷基化。在 N-叔丁基、N-α-苯乙基和 N-二苯甲基酰胺的情况下,在 -30 °C 下生成的氯三苯氧基氯化鏻 (TPCCl 2 ) 也是有效的。