Regiospecific synthesis of α-ketoacetals by rearrangement of α-bromo-α-fluoroketones
作者:Norbert De Kimpe、Roland Verhé、Laurent De Buyck、N. Schamp
DOI:10.1016/0040-4039(80)80018-9
日期:1980.1
α-Ketoacetals, derived from alkylaryl-α-diones and with acetalized benzoyl moiety, were synthesized by alkoxide induced rearrangement of α-bromo-α-fluoroalkylarylketones.
the synthesis of fluorinatedcompounds have been intensively studied, recently. Development of practical fluorinating reagents is indispensable for this purpose. Herein, bench-stable electrophilic fluorinating reagents were synthesized as N-fluorobenzenesulfonimide (NFSI) substitutes. Reagents obtained by replacing one of the NFSI sulfonyl groups with an acyl group led to the highly selective monofluorination
Decarboxylative fluorination of β-Ketoacids with N-fluorobenzenesulfonimide (NFSI) for the synthesis of α-fluoroketones: Substrate scope and mechanistic investigation
作者:Rui Zhang、Chuanfa Ni、Zhengbiao He、Jinbo Hu
DOI:10.1016/j.jfluchem.2017.08.010
日期:2017.11
Cesium carbonate (Cs2CO3)-mediated decarboxylativefluorination of β-ketoacids using NFSI in the MeCN/H2O mixed solvent system affords α-fluoroketones with a broad scope. Both electron-rich and electron-deficient α-non-substituted β-ketoacids are amenable to this protocol. The mechanistic study indicates that the reaction proceeds through electrophilic fluorination followed by decarboxylation, which
在MeCN / H 2 O混合溶剂体系中,使用NFSI进行碳酸铯(Cs 2 CO 3)介导的β-酮酸的脱羧氟化反应,可以得到范围很广的α-氟代酮。富含电子的和缺乏电子的α-非取代的β-酮酸均适用于该方案。机理研究表明,反应是通过亲电氟化反应继之以脱羧反应进行的,这不同于普通羧酸的脱羧氟化反应。
A Carbene Strategy for Progressive (Deutero)Hydrodefluorination of Fluoroalkyl Ketones
作者:Xiaolong Zhang、Xinyu Zhang、Qingmin Song、Paramasivam Sivaguru、Zikun Wang、Giuseppe Zanoni、Xihe Bi
DOI:10.1002/anie.202116190
日期:2022.2.7
A carbene strategy for the sequential (deutero)hydrodefluorination of fluoroalkyl ketones is reported. This method allowed for the controllable preparation of difluoroalkyl- and monofluoroalkyl ketones from aryl- and alkyl-substituted perfluoroalkyl ketones in high yield with excellent functional group tolerance.