Detrifluoroacetylation Reaction of Trifluoromethyl-β-diketones: Facile Method for the Synthesis of Succinimide Derivatives and 1,4-Diketones
作者:Li-Hua Wang、Jing Zhao
DOI:10.1002/ejoc.201800680
日期:2018.8.23
A detrifluoroacetylation of trifluoromethyl‐β‐diketones has been developed, which allows for the synthesis of succinimides and 1,4‐diketones through cascade Michael addition/retro‐Claisen reaction and nucleophilic substitution/retro‐Claisen reaction.
Synthesis of α,α-difluorobenzoyl oxygen heterocycles via the radical reaction of 2-iodo-2,2-difluoroacetophenones with unsaturated acids or unsaturated alcohols
A convenient and facile method for the direct synthesis of α,α-difluorobenzoyl lactones or cyclic ethers via the radical cyclization reaction of 2-iodo-2,2-difluoroacetophenone with unsaturated acids or alcohols was reported.
A nickel-catalyzed couplingreaction of α-bromo-α-fluoroketones with arylboronic acids was reported, which provides an efficient pathway to access 2-fluoro-1,2-diarylethanones in high yields. We also disclosed the synthesis of the monofluorination agents α-bromo-α-fluoroketones by using a trifluoroacetate release protocol. Mechanistic investigation indicated that a monofluoroalkyl radical is involved
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。