[EN] METHOD FOR THE PREPARATION OF FUNCTIONALIZED TRIHALOMETHOXY SUBSTITUTED PYRIDINES<br/>[FR] PROCÉDÉ DE PRÉPARATION DE PYRIDINES SUBSTITUÉES PAR UN RÉSIDU TRIHALOGÉNOMÉTHOXY FONCTIONNALISÉES
申请人:BAYER CROPSCIENCE AG
公开号:WO2010040461A1
公开(公告)日:2010-04-15
The present invention pertains to a process for the preparation of functionalized trihalomethoxypyridines of formula (I) comprising reacting hydroxypyridines with thiophosgene in the presence of a base; reacting the obtained chlorothionoformiates with elemental chlorine and finally converting trichloromethoxy pyridines to trihalomethoxy pyridines using a fluoride source.
A General Approach to (Trifluoromethoxy)pyridines: First X-ray Structure Determinations and Quantum Chemistry Studies
作者:Baptiste Manteau、Pierre Genix、Lydia Brelot、Jean-Pierre Vors、Sergiy Pazenok、Florence Giornal、Charlotte Leuenberger、Frédéric R. Leroux
DOI:10.1002/ejoc.201000958
日期:2010.11
regioselective functionalization by organometallic methods has been studied and has afforded new and highly important building blocks for life-sciences-oriented research. In addition, the first X-ray crystallographic structure determinations of (trifluoromethoxy)pyridines have been performed. Lowest-energy conformations of (trifluoromethoxy)pyridines and (trifluoromethoxy)pyridinium cations were determined
以前未知的 2-、3- 和 4-(三氟甲氧基)吡啶现在通过高效且直接的大规模合成变得容易获得。已经研究了它们通过有机金属方法进行的区域选择性功能化,并为面向生命科学的研究提供了新的和非常重要的基石。此外,还进行了(三氟甲氧基)吡啶的首次 X 射线晶体结构测定。(三氟甲氧基)吡啶和(三氟甲氧基)吡啶鎓阳离子的最低能量构象是通过计算机研究确定的。
METHOD FOR THE PREPARATION OF FUNCTIONALIZED TRIHALOMETHOXY SUBSTITUTED PYRIDINES
申请人:Bayer CropScience AG
公开号:EP2350008A1
公开(公告)日:2011-08-03
Sequential Xanthalation and <i>O</i>-Trifluoromethylation of Phenols: A Procedure for the Synthesis of Aryl Trifluoromethyl Ethers
作者:Makoto Yoritate、Allyn T. Londregan、Yajing Lian、John F. Hartwig
DOI:10.1021/acs.joc.9b02717
日期:2019.12.20
known methods to synthesize aryl trifluoromethyl ethers require harsh reagents and highly controlled reaction conditions and rarely occur when heteroaromatic units are present. The two-step O-trifluoromethylation of phenols via aryl xanthates is one such method that suffers from these drawbacks. Herein, we report a method for the synthesis of aryl trifluoromethyl ethersfrom phenols by the facile conversion