Electronic effect on the regioselectivity in the ring opening of para-substituted phenyloxiranes by acetylides
作者:Mitsuru Shindo、Tomoyuki Sugioka、Kozo Shishido
DOI:10.1016/j.tetlet.2004.10.049
日期:2004.12
The electronic effect on the regioselectivity in the alkynylation of phenyloxiranes was investigated using three kinds of metal acetylides. BF3 mediated lithium acetylide provided either the alpha- or beta-alkynylated products by controlling the effect of the para-substituents of the phenyloxiranes. LiClO4 mediated lithium acetylide and titanium acetylide, on the other hand, afforded predominantly the beta- and alpha-products, respectively. (C) 2004 Elsevier Ltd. All rights reserved.
α-C–H Functionalization of π-Bonds Using Iron Complexes: Catalytic Hydroxyalkylation of Alkynes and Alkenes
作者:Yidong Wang、Jin Zhu、Austin C. Durham、Haley Lindberg、Yi-Ming Wang
DOI:10.1021/jacs.9b11716
日期:2019.12.18
functionalization of C-Hbonds enables streamlined and sustainable solutions to problems in synthetic organic chemistry. In this Communication, we disclose an iron-based catalytic system for the functionalization of propargylic and allylic C-Hbonds. Inexpensive and readily-available cyclopentadienyliron(II) dicarbonyl complexes were employed as catalysts for a novel deprotonative activation mode for C-H functionalization
发现基于地球丰富的过渡金属的催化体系用于 CH 键的功能化,为合成有机化学中的问题提供了简化和可持续的解决方案。在本通讯中,我们公开了一种用于炔丙基和烯丙基 CH 键功能化的铁基催化系统。廉价且容易获得的环戊二烯基 (II) 二羰基配合物被用作 CH 官能化的新型去质子活化模式的催化剂,这种方法允许不饱和结构单元与芳基醛和其他羰基亲电子试剂直接结合,以提供一系列不饱和的在操作简单和官能团耐受反应条件下的醇偶联产物。