Catalytic Decarboxylative Fluorination for the Synthesis of Tri- and Difluoromethyl Arenes
摘要:
Treatment of readily available alpha,alpha-difluoro- and alpha-fluoroarylacetic acids with Selecffluor under Ag(I) catalysis led to decarboxylative fluorination. This operationally simple reaction gave access to tri- and difluoromethylarenes applying a late-stage fluorination strategy. Translation to [F-18]labeling is demonstrated using [F-18]Selectfluor bis(triflate), a reagent affording [F-18]tri- and [F-18]difluoromethylarenes not within reach with [F-18]F-2.
Pd-Catalyzed α-Arylation of Trimethylsilyl Enolates of α,α-Difluoroacetamides
作者:Shaozhong Ge、Sophie I. Arlow、Michael G. Mormino、John F. Hartwig
DOI:10.1021/ja508590k
日期:2014.10.15
ilyl)acetamides with aryl and heteroaryl bromides catalyzed by an air- and moisture-stable palladacyclic complex containing P(t-Bu)2Cy as ligand. A broad range of electronically varied aryl and heteroaryl bromides underwent this transformation to afford α-aryl-α,α-difluoroacetamides in high yields. Due to the electrophilicity of the fluorinated amide, this palladium-catalyzed cross-coupling reaction
An efficient and generally applicable protocol for decarboxylative coupling of α,α‐difluoroarylacetic acids with ethynylbenziodoxolone (EBX) reagents has been developed, affording α,α‐difluoromethylated alkynes bearing various functional groups in moderate to excellent yields. Remarkably, this potassium persulfate (K2S2O8)‐promoted reaction employs water as solvent under transition metal‐free conditions
已经开发出一种有效且普遍适用的方案,用于将α,α-二氟代芳酸与乙炔基苯并恶唑酮(EBX)试剂进行脱羧偶联,从而以中等至极好的收率提供带有各种官能团的α,α-二氟甲基化炔烃。值得注意的是,这种过硫酸钾(K 2 S 2 O 8)促进的反应在无过渡金属的条件下将水用作溶剂,从而为α,α-二氟甲基化炔烃提供了绿色的合成方法。
Silver‐Catalyzed Decarboxylative Allylation of Difluoroarylacetic Acids with Allyl Sulfones in Water
作者:Xiang Li、Ruihong Zhang、Xiaofei Zhang、Peiyuan Zhu、Tuanli Yao
DOI:10.1002/asia.202000059
日期:2020.4
A practical silver-catalyzed decarboxylative allylation of α,α-difluoroarylacetic acids with allyl sulfones is described, which provides a variety of β,β -difluorinated alkenes in good yields. Notably, the reaction proceeds smoothly in water with good functional group tolerance. The practicality and synthetic value of this process was demonstrated by scaled-up experiment and elaboration of the products
.alpha.,.alpha.-Difluoroarylacetic acids: preparation from (diethylamino)sulfur trifluoride and .alpha.-oxoarylacetates
作者:W. J. Middleton、E. M. Bingham
DOI:10.1021/jo01302a025
日期:1980.7
Novel phosphate mimetics for the design of non-peptidyl inhibitors of protein tyrosine phosphatases
作者:Christopher C. Kotoris、Mei-Jin Chen、Scott D. Taylor
DOI:10.1016/s0960-894x(98)00598-8
日期:1998.11
Benzylic alpha,alpha-difluorosulfonates, alpha,alpha-dinuorotetrazoles, and alpha,alpha-difluorocarboxylates of type 5 and 6 were synthesized and examined as potential phosphate biosteres for PTP1B inhibition. The alpha,alpha-difluorosulfonates and alpha,alpha-difluorotetrazoles were found to be more effective inhibitors than the analogous compounds bearing the fluoromalonyl group, a phosphate biostere currently being used for PTP inhibition. (C) 1998 Elsevier Science Ltd. All rights reserved.