examples of an iron‐catalyzed three‐component synthesis of homoallylic boronates from regioselective union of bis(pinacolato)diboron, an alkenyl halide (bromide, chloride or fluoride), and an olefin are disclosed. Products that bear tertiary or quaternary carbon centers could be generated in up to 87 % yield as single regioisomers with complete retention of the olefin stereochemistry. With cyclopropylidene‐containing
Process for preparing 1-bromoalkylbenzene derivatives and intermediates thereof
申请人:SUMITOMO CHEMICAL COMPANY LIMITED
公开号:EP0637580A1
公开(公告)日:1995-02-08
A 1-bromoalkylbenzene derivative is prepared by reacting a phenylalkene derivative with hydrogen bromide in the presence of a non-polar solvent. The phenylalkene derivative is prepared by reacting an alkenyl halide with metal magnesium to form a Grignard reagent, and then reacting the Grignard reagent with a benzyl halide derivative. An allyl Grignard reagent is prepared by reacting continuously an allyl halide derivative with metal magnesium in an organic solvent, in which the allyl halide derivative and metal magnesium are continuously added to the reaction system and the allyl Grignard reagent formed is continuously removed from the reaction system. The processes provide the intended compounds in high yields, high selectivities and high purities.
1-bromoalkylbenzene derivative is prepared by reacting a phenylalkene derivative with hydrogen bromide in the presence of a non-polar solvent.苯基烷烃衍生物的制备方法是先使烯基卤化物与金属镁反应生成格氏试剂,然后使格氏试剂与苄基卤化物衍生物反应。烯丙基格氏试剂是通过烯丙基卤化物衍生物与金属镁在有机溶剂中连续反应制备的,其中烯丙基卤化物衍生物和金属镁被连续加入反应体系,形成的烯丙基格氏试剂被连续从反应体系中移除。这些工艺可提供高产率、高选择性和高纯度的预期化合物。
US5637736A
申请人:——
公开号:US5637736A
公开(公告)日:1997-06-10
US6063940A
申请人:——
公开号:US6063940A
公开(公告)日:2000-05-16
Synergistic Hydrocobaltation and Borylcobaltation Enable Regioselective Migratory Triborylation of Unactivated Alkenes
作者:Yinsong Zhao、Shaozhong Ge
DOI:10.1002/anie.202116133
日期:2022.3.28
A regioselective cobalt-catalyzed triborylation of unactivatedalkenes is developed to access synthetically versatile 1,1,3-triborylalkanes with a catalyst generated from Co(acac)2 and xantphos. Mechanistic studies reveal that this triborylation reaction proceeds through three interdependent catalytic cycles.