Catalytic, Regioselective Hydrocarbofunctionalization of Unactivated Alkenes with Diverse C–H Nucleophiles
作者:Kin S. Yang、John A. Gurak、Zhen Liu、Keary M. Engle
DOI:10.1021/jacs.6b08850
日期:2016.11.9
constructed from two classes of commonly available starting materials, alkenes and carbon-hydrogen (C-H) bonds. The reaction employs a palladium(II) catalyst and utilizes a removable directing group to both control the regioselectivity of carbopalladation and enable subsequent protodepalladation. A wide range of alkenes and C-H nucleophiles, including 1,3-dicarbonyls, aryl carbonyls, and electron-rich aromatics
形成碳-碳 (CC) 键的反应是有机合成的基石,广泛应用于化学科学。我们报告了一种转化,该转化使 CC 键能够由两类常用的起始材料、烯烃和碳氢 (CH) 键构成。该反应使用钯 (II) 催化剂并利用可去除的导向基团来控制碳钯化的区域选择性并实现随后的原脱钯。广泛的烯烃和 CH 亲核试剂,包括 1,3-二羰基化合物、芳基羰基化合物和富电子芳烃,都是可行的反应伙伴,使迈克尔型反应性从 α,β-不饱和羰基化合物扩展到未活化的烯烃。描述了这种转化在药物多样化和天然产物全合成中的应用。
Cp<sub>2</sub>ZrCl<sub>2</sub>-Mediated Three-Component Coupling Reactions of CO<sub>2</sub>, Ethylene (or Alkynes), and Electrophiles Leading to Carboxylic Acid Derivatives
作者:Naoto Chatani、Kohei Yamashita
DOI:10.1055/s-2005-864807
日期:——
pressure of CO 2 . The treatment of Cp 2 ZrCl 2 with EtMgBr followed by exposure to CO 2 generates zirconacycle 1, which can react with various electrophiles to give a variety of carboxylic acid derivatives. Unsaturated zircona-cycles 2 can also generated from Cp 2 ZrCl 2 , EtMgBr, alkynes, and CO 2 . Complexes 2 react with electrophiles to give α,β-unsaturated acids stereoselectively.