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
Direct α-Fluorination of Ketones Using N-F Reagents
作者:Stojan Stavber、Marjan Jereb、Marko Zupan
DOI:10.1055/s-2002-35625
日期:——
bis(tetrafluoroborate) (Accufluor NFTh) as a fluorine atom transfer reagent and methanol as solvent enabled direct regiospecific fluorofunctionalization of the u-carbonyl position in ketones without prior activation of the target molecules. Methoxy or hydroxy substituted derivatives of 1-indanone, 1-tetralone and oxo derivatives of thiophene, benzo[b]thiophene, benzofuran and benzopyran were regiospecifically
A diastereoselective Mannich reaction of α-fluoroketones with ketimines: Construction of β-fluoroamine motifs with vicinal tetrasubstituted stereocenters
作者:Jian-bo Zhao、Xinfeng Ren、Bu-quan Zheng、Jian Ji、Zi-bin Qiu、Ya Li
DOI:10.1016/j.tetlet.2018.04.051
日期:2018.5
reaction has been developed for the synthesis of chiral β-fluoroamine motifs by the reaction of α-fluoroketones with ketimines, including isatin-derived ketimines and phenylglyoxylate-derived ketimines. This method provides a concise route to a variety of biologically important 3-aminooxindoles and α-amino acids featuring fluorine-containing vicinaltetrasubstituted stereocenters.
The superior nucleofuge character of chlorine over fluorine was taken advantage of in the selective SN2′ substitution reaction of gem-chlorofluoropropenes, allowing for the clean formation of β-substituted monofluoroalkenes under metal-free conditions. Numerous N-, S-, O-, and C-nucleophiles behaved nicely in this system. Further synthetic transformations of selected monofluoroalkenes were also accomplished
在宝石-氯氟丙烯的选择性S N 2'取代反应中,利用了氯优于氟的核沉子特性,从而可以在无金属的条件下干净地形成β-取代的单氟烯烃。在该系统中,许多N-,S-,O-和C-亲核试剂表现良好。还完成了所选单氟烯烃的进一步合成转化。
Catalytic Asymmetric Mannich Reactions with Fluorinated Aromatic Ketones: Efficient Access to Chiral β-Fluoroamines
作者:Barry M. Trost、Tanguy Saget、Andreas Lerchen、Chao-I Joey Hung
DOI:10.1002/anie.201509719
日期:2016.1.11
herein is a Zn/Prophenol‐catalyzed Mannich reactionusing fluorinated aromatic ketones as nucleophilic partners for the direct enantio‐ and diastereoselective construction of β‐fluoroamine motifs featuring a fluorinated tetrasubstituted carbon. The reaction can be run on a gram scale with a lowcatalystloading without impacting its efficiency. Moreover, a related aldolreaction was also developed. Together