Transition‐Metal‐Free Cross‐Coupling of Benzothiophenes and Styrenes in a Stereoselective Synthesis of Substituted (
<i>E,Z</i>
)‐1,3‐Dienes
作者:Mindaugas Šiaučiulis、Nanna Ahlsten、Alexander P. Pulis、David J. Procter
DOI:10.1002/anie.201902903
日期:2019.6.24
transition metal‐free one‐pot stereoselective approach to substituted (E,Z)‐1,3‐dienes was developed by using an interrupted Pummerer reaction/ligand‐coupling strategy. Readily available benzothiophene S‐oxides, which can be conveniently prepared by oxidation of the parent benzothiophenes, undergo Pummerer coupling with styrenes. Reaction of the resultant sulfonium salts with alkyllithium/magnesium reagents
通过使用间断的Pummerer反应/配体偶联策略,开发了一种用于过渡金属(E,Z)-1,3-二烯的无过渡金属单锅立体选择方法。现成的苯并噻吩S-氧化物可以通过母体苯并噻吩的氧化方便地制备,然后与苯乙烯进行Pummerer偶联。生成的sulf盐与烷基锂/镁试剂的反应生成了利用不足的高价硫烷中间体,这些中间体经过选择性配体偶联,导致苯并噻吩基序的分解和修饰的(E,Z)-1,3-二烯的形成。