Generation of Aryl and Heteroaryl Magnesium Reagents in Toluene by Br/Mg or Cl/Mg Exchange
作者:Dorothée S. Ziegler、Konstantin Karaghiosoff、Paul Knochel
DOI:10.1002/anie.201802123
日期:2018.5.28
very fast Br/Mg exchange with aryl and heteroaryl bromides, producing aryl and heteroaryl magnesium alkoxides (ArMgOR⋅LiOR) in toluene. These Grignard reagents react with a broad range of electrophiles, including aldehydes, ketones, allyl bromides, acyl chlorides, epoxides, and aziridines, in good yields. Remarkably, the related reagent sBu2Mg⋅2 LiOR (R=2‐ethylhexyl) undergoes Cl/Mg exchange with various
以1.5 m的甲苯溶液形式制备的烷基镁醇盐sBuMgOR·LiOR(R = 2-乙基己基), 与芳基和杂芳基溴化物进行非常快速的Br / Mg交换,从而生成芳基和杂芳基镁醇盐(ArMgOR·LiOR)。甲苯。这些格氏试剂与多种亲电子试剂反应,收率很高,包括醛,酮,烯丙基溴,酰氯,环氧化物和氮丙啶。值得注意的是,相关的试剂SBU 2 Mg⋅2LIOR(R = 2-乙基己基)经历CL /在甲苯各种富电子芳基氯化物的Mg交换,产生类型的Ar diorganomagnesium物种2 Mg⋅2LIOR,其与醛反应良好和烯丙基溴。