Conversion of methyl ketones and methyl sulfones into α-deutero-α,α-difluoromethyl ketones and α-deutero-α,α-difluoromethyl sulfones in three synthetic steps
作者:Munia F. Sowaileh、Changho Han、Robert A. Hazlitt、Eun Hoo Kim、Jinu P. John、David A. Colby
DOI:10.1016/j.tetlet.2016.12.018
日期:2017.2
Deuterodifluoromethyl ketones and sulfones were assembled in three synthetic steps from methylketones and sulfones, respectively. The key synthetic transformation is the deuteration of the difluorocarbanion generated by the release of trifluoroacetate from highly α-fluorinated gem-diols. High levels of deuterium on the "CF2D" group were routinely observed. This strategy is mild and versatile and it
Synthesis of Difluorinated Halohydrins by the Chemoselective Addition of Difluoroenolates to α-Haloketones
作者:Munia F. Sowaileh、Maali D. Alshammari、David A. Colby
DOI:10.1021/acs.orglett.1c01636
日期:2021.7.2
α-Haloketones are valuable intermediates in the synthesis of pharmaceuticals and natural products because they display two electrophiles. Although chemoselective additions to each of these functional groups are known, the use of fluorinated nucleophiles has not been characterized, except for the dimerization of fluorohalomethyl ketones. Our studies demonstrate the use of difluoroenolates to create
Evaluation of Difluoromethyl Ketones as Agonists of the γ-Aminobutyric Acid Type B (GABA<sub>B</sub>) Receptor
作者:Changho Han、Amy E. Salyer、Eun Hoo Kim、Xinyi Jiang、Rachel E. Jarrard、Matthew S. Powers、Aaron M. Kirchhoff、Tolani K. Salvador、Julia A. Chester、Gregory H. Hockerman、David A. Colby
DOI:10.1021/jm301805e
日期:2013.3.28
design, synthesis, biological evaluation, and in vivo studies of difluoromethyl ketones as GABAB agonists that are not structurally analogous to known GABAB agonists, such as baclofen or 3-aminopropyl phosphinic acid, are presented. The difluoromethyl ketones were assembled in three synthetic steps using a trifluoroacetate-release aldol reaction. Following evaluation at clinically relevant GABA receptors
Agonists of the γ-aminobutyric acid type B (GABAB) receptor derived from β-hydroxy and β-amino difluoromethyl ketones
作者:Munia F. Sowaileh、Amy E. Salyer、Kuldeep K. Roy、Jinu P. John、James R. Woods、Robert J. Doerksen、Gregory H. Hockerman、David A. Colby
DOI:10.1016/j.bmcl.2018.04.003
日期:2018.9
difluoromethyl ketones represent the newest class of agonists of the GABA-B receptor, and they are structurally distinct from all other known agonists at this receptor because they do not display the carboxylic acid or amino group of γ-aminobutyric acid (GABA). In this report, the design, synthesis, and biological evaluation of additional analogues of β-hydroxy difluoromethyl ketones characterized the
Magnesium-Promoted Additions of Difluoroenolates to Unactivated Imines
作者:Alex L. Nguyen、Hari R. Khatri、James R. Woods、Cassidy S. Baldwin、Frank R. Fronczek、David A. Colby
DOI:10.1021/acs.joc.7b03014
日期:2018.3.16
produce fluorinated and trifluoromethylated organic structures, the construction of difluoromethylated compounds remains a synthetic challenge. We have discovered that unactivated imines will react with difluoroenolates under exceedingly mild conditions when using magnesium salts and organic bases. We have applied this approach to the iminoaldol reaction to produce difluoromethylene groups as α,α-dif