synthesis of 1,3-dienes by a sequential process consisting of a palladium-catalyzed, base-free, Suzuki–Miyaura coupling/isomerization sequence. This sequence couples boronic acids with propargyl alcohols, generating the requisite allene in situ, followed by conversion of the unactivated allene to its 1,3-diene via a hydro-palladation/dehydro-palladation process. This process is general for a range of boronic
我们报告了一种由
钯催化,无碱,Suzuki-Miyaura偶联/异构化序列组成的顺序过程,用于合成1,3-二烯的简便方法。该序列将
硼酸与炔
丙醇偶合,在原位生成必需的
丙二烯,然后通过加氢palpalation /脱氢palpalation过程将未活化的alene转化为其1,3-二烯。对于一系列
硼酸,包括具有给电子和吸电子基团的
硼酸,以及杂芳基
硼酸,该方法是通用的。该过程的关键是无碱Suzuki-Miyauru偶联的
硼酸副产物,该副产物可生成异构化所需的
钯-氢络合物[H-Pd II -OB(OH)2 ]。