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
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
COMPOSITIONS AND PROCESSES OF PREPARING AND USING THE SAME
申请人:Colby David A.
公开号:US20140039182A1
公开(公告)日:2014-02-06
The present invention relates to compositions, for example, the DBU/Hexafluoroacetone hydrate salt, and processes of preparing and using the same for the modification of chemical compounds via the release of trifluoroacetate. The DBU/Hexafluoroacetone hydrate salt can perform trifluoromethylation reactions on chemical compounds, such as carbonyl group-containing compounds.
Cleavage of Carbon−Carbon Bonds through the Mild Release of Trifluoroacetate: Generation of α,α-Difluoroenolates for Aldol Reactions
作者:Changho Han、Eun Hoo Kim、David A. Colby
DOI:10.1021/ja202213f
日期:2011.4.20
The selective cleavage of carbon-carbonbonds is a significant challenge in synthetic chemistry, yet this strategy can be a powerful way to generate reactive intermediates. We have discovered that, through the facile release of trifluoroacetate which occurs by C-C bond scission, difluoroenolates can be generated under very mild reaction conditions. Unlike existing reactions, this method is not limited
碳-碳键的选择性断裂是合成化学中的一项重大挑战,但这种策略可以成为生成活性中间体的有效方法。我们已经发现,通过 CC 键断裂发生的三氟乙酸盐的轻松释放,可以在非常温和的反应条件下生成二氟烯醇化物。与现有反应不同,该方法不限于一小组氟化结构单元。我们已将此过程应用于羟醛反应以安装二氟亚甲基。