成功苄C(SP 3) ħ三氟甲基化,pentafluoroethylation,和的六元杂芳族化合物heptafluoropropylation分别实现为实用的第一实例苄基C(SP 3) ħ全氟烷基化。在这些反应中,BF 2 C n F 2 n +1(n = 1–3)既充当路易斯酸以激活苄基位置,又充当C n F 2 n +1(n= 1–3)源。全氟烷基化在烷基链的末端和内部进行。全氟烷基化产物以中等至优异的产率获得,即使以克为单位,也可以不分离中间体而按顺序进行。通过使用该方法,生物活性化合物的三氟甲基化以及将CF 3基引入生物活性分子骨架中在区域上进行。
A General Synthesis of Bis(<i>o</i>-azaheteroaryl)methane Derivatives from<i>N</i>-Oxides of Azines and Azoles
作者:Magdalena Szpunar、Rafał Loska
DOI:10.1002/ejoc.201500072
日期:2015.4
A general method of preparation of derivatives of bis(o-azaheteroaryl)methanes from aromatic N-oxides is reported, the key step of which is a 1,3-dipolar cycloaddition between N-oxides of azines or azoles and in situ generated terminal difluoroalkenes containing an o-azaheteroaryl substituent at the double bond. Selected products were applied for the preparation of two novel unsymmetrical analogues
Copper-Mediated Deoxygenative Trifluoromethylation of Benzylic Xanthates: Generation of a CCF<sub>3</sub>Bond from an O-Based Electrophile
作者:Lingui Zhu、Shasha Liu、Justin T. Douglas、Ryan A. Altman
DOI:10.1002/chem.201302328
日期:2013.9.16
are capable of converting O‐based electrophiles into trifluoromethanes. The copper‐mediated trifluoromethylation of benzylicxanthates using Umemoto’s reagent as the source of CF3 to form CCF3 bonds is described. The method is compatible with an array of benzylicxanthates bearing useful functional groups. A preliminary mechanistic investigation suggests that the CCF3 bond forms by reaction of the
Copper-mediated chemoselective trifluoromethylation at the benzylic :position by the use of shelf-stable electrophilic trifluoromethylating reagents 3 in good to high yields under mild conditions is described for the first time. The generality of this trifluoromethylation for a wide variety of benzyl bromides facilitates the rapid creation of structural diversity of medicinal candidates in drug discovery.
A new synthesis of trifluorinated compounds via 1,1-dichloro-1-alkenes in superacid
A two step process for converting ketone or aldehyde via 1,1-dichloro-1-alkenes to the corresponding 1,1,1-trifluoro-derivatives is described, based on HF addition and chlorine-fluorine exchange under superacidic conditions. (c) 2007 Elsevier Ltd. All rights reserved.