Synthesis of α,α-difluoro-β-amino carbonyl-containing sulfonamides and related compounds
作者:Chen Xie、Lingmin Wu、Jie Zhou、Haibo Mei、Vadim A. Soloshonok、Jianlin Han、Yi Pan
DOI:10.1016/j.jfluchem.2015.01.004
日期:2015.4
Mannich addition reactions between in situ generated α,α-difluoroenolates and various N-sulfonyl imines readily occur with exceptionally high reaction rates at ambient temperature. The method features remarkable generality and enjoys operationally convenient conditions underscoring its practicality and methodological importance for preparation of sulfonamides bearing β-amino-α,α-difluoro ketone moiety
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。
Generalized access to fluorinated β-keto amino compounds through asymmetric additions of α,α-difluoroenolates to CF<sub>3</sub>-sulfinylimine
作者:Chen Xie、Lingmin Wu、Haibo Mei、Vadim A. Soloshonok、Jianlin Han、Yi Pan
DOI:10.1039/c4ob01575d
日期:——
CF3-containing chiral imines readily react with α,α-difluoroenolates affording a novel type of β-keto-amino compounds featuring the R-CO-CF2-CH(NH2)-CF3 moiety. The reactions feature exceptional generality allowing preparation of various aromatic, hetero-aromatic and aliphatic derivatives in high yields and diastereoselectivity. The products are configurationally stable and can be transformed to more
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.
Synthesis of α,α-Difluoro-β-amino Ketones from N-Boc-α-Amidosulfones and Pentafluoro-gem-diols
作者:Baharul Islam、Suresh P. Sulochana、David A. Colby
DOI:10.1021/acs.joc.3c02181
日期:2024.5.3
circumvent the synthesis and isolation of imines, a method was devised to construct α,α-difluoro-β-amino ketones from N-Boc-α-amidosulfones. The reactive nucleophiles, difluoroenolates, are generated in situ from the pentafluoro-gem-diols using cesium fluoride in pyridine. NMR studies confirm the role of the α-amidosulfones in this process. Incubation of the α,α-difluoro-β-amino ketones in rat serum