Catalytic and direct methyl sulfonylation of alkenes and alkynes using a methyl sulfonyl radical generated from a DMSO, dioxygen and copper system
作者:Yaojia Jiang、Teck-Peng Loh
DOI:10.1039/c4sc01901f
日期:——
This paper describes an efficient method to β-keto methyl sulfones and (E)-vinyl methyl sulfones using DMSO as the substrate. The methyl sulfonyl radical generated from DMSO in the presence of catalytic Cu(I) under O2 atmosphere is believed to be involved in this reaction. Isotopic labeling and 18O2 experiments were performed to investigate the reaction mechanism.
本文介绍了一种有效的方法,以DMSO为底物,制备β-酮甲基砜和(E)-乙烯基甲基砜。据信在O 2气氛下在催化性Cu(I)存在下由DMSO产生的甲基磺酰基自由基参与了该反应。进行同位素标记和18 O 2实验以研究反应机理。
Divergent Regio‐ and Stereoselective Gold‐catalyzed Synthesis of α‐Fluorosulfones and β‐Fluorovinylsulfones from Alkynylsulfones
作者:Xiaojun Zeng、Shiwen Liu、Gerald B. Hammond、Bo Xu
DOI:10.1002/chem.201703179
日期:2017.9.4
We developed a widely applicable, highly efficient synthesis of α‐fluorosulfone and β‐fluorovinylsulfone catalyzed by gold. Starting with alkynyl sulfone 1, an [Au]/HF/N‐oxide system gives α‐fluorosulfone 3 via a gold carbene intermediate, and, if no N‐oxide is used, direct addition of HF to 1 gives vinyl sulfone 4 via a vinylfluoro gold intermediate. Both methods have good functional group tolerance
Polycyclic thiazolidin-2-ylidene amines, process for their preparation,
申请人:Aventis Pharma Deutschland GmbH
公开号:US06159996A1
公开(公告)日:2000-12-12
Polycyclic thiazolidin-2-ylidene amines and their physiologically tolerable salts and physiologically functional derivatives of the formula I ##STR1## in which the radicals have the meanings indicated, and their physiologically tolerable salts and a process for their preparation are described. The compounds are suitable, for example, as anorectics.