Synthesis of Aryl and Arylmethyl Phosphonates by Cross-Coupling of Aryl or Arylmethyl Halides (X = I, Br and Cl) with Diisopropyl H-Phosphonate
作者:Kai Xu、Hao Hu、Fan Yang、Yangjie Wu
DOI:10.1002/ejoc.201201230
日期:2013.1
applicable protocol for the palladacycle-catalysed arylation or K2CO3-promoted arylmethylation of diisopropyl H-phosphonate has been developed. The remarkable features of the palladacycle-catalysed arylation reaction include wide substrate scope (aryl iodides, bromides and chlorides), significant shortening of the reaction time (2 or 3 h) and a low catalyst loading of 1 mol-%. Note that with the base K2CO3
已经开发了一种有效且普遍适用的协议,用于二异丙基 H-膦酸酯的钯环催化芳基化或 K2CO3 促进的芳基甲基化。钯环催化的芳基化反应的显着特点包括底物范围广(芳基碘化物、溴化物和氯化物)、反应时间显着缩短(2 或 3 小时)和催化剂负载量低(1 mol%)。请注意,以碱 K2CO3 作为促进剂,可以在没有任何钯催化剂的情况下实现芳甲基化。此外,第一个以 tBuOK 为碱的钯催化的富电子芳基氯化物磷酸化的例子已经实现。这一结果可以被认为是对 Montchamp 和 Han 早期工作的重要改进和补充,