1,2-H Shift in Copper−Chlorocarbenoid Intermediate during CuCl/bpy-Promoted Stereoselective Dechlorination of 2,2,2-Trichloroethyl Alkyl Ethers to (Z)-1-Alkoxy-2-chloroethenes
摘要:
Reaction of 2,2,2-trichloroethyl alkyl ethers with 2 molar equiv of CuCl/bpy in refluxing DCE yielded (2)-1-alkoxy-2-chloroethenes stereoselectively as the major product via 1,2-H shift in copper-chlorocarbenoid intermediate. 2,2,2-Trichloroethyl carboxylates undergo a radical 1,2-acyloxy shift under similar conditions.
Au-Catalyzed Addition of Nucleophiles to Chloroalkynes: A Regio- and Stereoselective Synthesis of (<i>Z</i>
)-Alkenyl Chlorides
作者:Congrong Liu、Yunbo Xue、Lianghui Ding、Haiyun Zhang、Fulai Yang
DOI:10.1002/ejoc.201801222
日期:2018.12.13
developed for the regio‐ and stereoselectivesynthesis of (Z)‐alkenyl chlorides via the gold‐catalyzed addition between chloroalkynes and protic nucleophiles. A broad range of protic nucleophiles smoothly react with aromatic, vinylic, or aliphatic chloroalkynes to afford various functionalized (Z)‐alkenyl chlorides with high to excellent yields and extremely high stereoselectivity.