Haloboration of
<i>o</i>
‐Alkynyl Phenols Generates Halogenated Bicyclic‐Boronates**
作者:Kang Yuan、Michael J. Ingleson
DOI:10.1002/anie.202301463
日期:——
O-directed alkyne trans-haloboration using BX3 (X=Cl or Br) leads to C4-halogenated benzoxaborinines that are useful intermediates for accessing the core structure found in bicyclic boronate based β-lactamase inhibitors. A computational study identified two viable mechanisms to furnish the trans-haloboration products.
Halocarbon chemistry. 1. (2-Hydroxyaryl)acetylenes from haloethyl aryl ethers. A new oxygen-to-carbon rearrangement
作者:Raghupathi Subramanian、Francis Johnson
DOI:10.1021/jo00225a100
日期:1985.12
SUBRAMANIAN, R.;JOHNSON, F., J. ORG. CHEM., 1985, 50, N 25, 5430-5432
作者:SUBRAMANIAN, R.、JOHNSON, F.
DOI:——
日期:——
Cyclization of Gold Acetylides: Synthesis of Vinyl Sulfonates via Gold Vinylidene Complexes
作者:Janina Bucher、Thomas Wurm、Kumara Swamy Nalivela、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/anie.201310280
日期:2014.4.7
Differently substituted terminal alkynes that bear sulfonate leaving groups at an appropriate distance were converted in the presence of a propynyl gold(I) precatalyst. After initial formation of a gold acetylide, a cyclization takes place at the β‐carbon atom of this species. Mechanistic studies support a mechanism that is related to that of dual gold‐catalyzed reactions, but for the new substrates
A Hg(OTf)<sub>2</sub>-Catalyzed Enolate Umpolung Reaction Enables the Synthesis of Coumaran-3-ones and Indolin-3-ones
作者:Zhouting Rong、Weican Hu、Ning Dai、Guoying Qian
DOI:10.1021/acs.orglett.0c01096
日期:2020.4.17
The potential of mercury catalysis has been extended to the arena of enolate umpolung reactions for the first time by the generation of enolonium species via Hg(OTf)2-catalyzed N-oxide addition to alkynes. The enolonium species formed can undergo intramolecular nucleophilic attack by hydroxyl or amino groups, leading to the synthesis of various coumaran-3-ones and indolin-3-ones.