Direct Synthesis of Tri‐/Difluoromethyl Ketones from Carboxylic Acids by Cross‐Coupling with Acyloxyphosphonium Ions
作者:Xanath Ispizua‐Rodriguez、Socrates B. Munoz、Vinayak Krishnamurti、Thomas Mathew、G. K. S. Prakash
DOI:10.1002/chem.202102854
日期:2021.11.17
Advantageous synthetic route: Deoxytrifluoromethylation and difluoromethylation of carboxylic acids give access to di- and trifluoromethyl ketones. The key to the success of these transformations is the use of acyloxyphosphonium ions prepared in situ as acyl electrophiles. The protocols use extremely mild reaction conditions and short reactions times and can tolerate a wide range of functional groups
Copper-Mediated Trifluoroacetylation of Arenediazonium Salts with Ethyl Trifluoropyruvate
作者:Wei Wu、Qinli Tian、Taotao Chen、Zhiqiang Weng
DOI:10.1002/chem.201604300
日期:2016.11.7
A copper‐mediated trifluoroacetylation of various arenediazoniumsalts with ethyl trifluoropyruvate is reported. The reaction proceeded smoothly under mild conditions at room temperature giving trifluoromethyl aryl ketones in moderate to good yields. A variety of functional groups, including methoxy, hydroxy, ester, ketone, trifluoromethyl, and halide groups, were well tolerated. A possible reaction
Convenient, functional group-tolerant, transition metal-free synthesis of aryl and heteroaryl trifluoromethyl ketones with the use of methyl trifluoroacetate
transition metal-free route to aryl trifluoromethyl ketones under mild conditions is described. The reaction of not only aryl Grignard reagents carrying reducible electrophilic functional groups, such as ester and cyano groups, but also electron-deficient nitrogen-containing heteroaryl Grignard reagents with methyl trifluoroacetate gives the corresponding aryl or heteroaryl trifluoromethyl ketones in good
The organocatalyticaerobicoxidation of electron‐deficient α‐fluoroalkylalcohols at roomtemperature is described. The resulting fluoroalkylketones are versatile synthetic intermediates for a variety of fluorine‐containing molecules. This otherwise difficult transformation has now been accomplished by the reaction of α‐fluoroalkylalcohols with N‐oxyl radicals, catalytically generated from 9‐azabicyclo[3