Synthesis of 1,3-Dienes via a Sequential Suzuki–Miyaura Coupling/Palladium-Mediated Allene Isomerization Sequence
作者:Yassir Al-Jawaheri、Marc C. Kimber
DOI:10.1021/acs.orglett.6b01841
日期:2016.7.15
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 ]。