Radical Amido‐ and Azido‐Fluorination of
α
‐Fluorostyrene Derivatives: An Innovative Approach Towards
β
‐Aryl‐
β
,
β
‐difluoroamino Motifs
摘要:
AbstractAn innovative one‐step synthesis towards β‐aryl‐β,β‐difluorocarbamates and β‐aryl‐β,β‐difluoroazides is presented. The described approach relies on the use of α‐fluorostyrene substrates in a radical addition/fluorination reaction with N‐centered radicals in the presence of Selectfluor®. The best results were obtained for the azidofluorination reaction. The resultant β‐aryl‐β,β‐difluoroazides were further transformed into Nitrogen‐based heterocycles (e. g. pyrrole, triazole, and tetrazole) and in more elaborated azide derivatives.
Design of fluorinated cyclopropane derivatives of 2-phenylcyclopropylmethylamine leading to identification of a selective serotonin 2C (5-HT2C) receptor agonist without 5-HT2B agonism
作者:Guiping Zhang、John D. McCorvy、Sida Shen、Jianjun Cheng、Bryan L. Roth、Alan P. Kozikowski
DOI:10.1016/j.ejmech.2019.111626
日期:2019.11
cyclopropane moieties were constructed through transition metal catalyzed [2 + 1]-cycloaddition of aromatic vinyl fluorides, and the absolute stereochemistry of the representative compound (-)-21a was established. Functional activity measuring calcium flux at 5-HT2 receptors reveals high potency for compounds (+)-21a-d. In particular, (+)-21b had no detectable 5-HT2B agonism and displayed reasonable selectivity
Expedient synthesis of α-substituted fluoroethenes
作者:Samir K. Mandal、Arun K. Ghosh、Rakesh Kumar、Barbara Zajc
DOI:10.1039/c2ob07031f
日期:——
mild and efficient synthesis of 1-aryl-1-fluoroethenes from benzothiazolyl (aryl)fluoromethyl sulfones and paraformaldehyde, under DBU- or Cs2CO3-mediated conditions at room temperature, is described. A comparable diethyl fluoro(naphthalen-2-yl)methylphosphonate reagent does not react with paraformaldehyde under these mild conditions. The utility of the methodology for synthesis of terminal α-fluoroalkenes
描述了在室温下,在 DBU 或 Cs 2 CO 3介导的条件下,由苯并噻唑基(芳基)氟甲基砜和多聚甲醛温和有效地合成 1-芳基-1-氟乙烯。类似的氟(萘-2-基)甲基膦酸二乙酯试剂在这些温和条件下不会与多聚甲醛发生反应。还显示了该方法用于合成带有吸电子官能团的末端 α-氟代烯烃的实用性。
Stereodivergent Alkyne Hydrofluorination Using Protic Tetrafluoroborates as Tunable Reagents
作者:Rui Guo、Xiaotian Qi、Hengye Xiang、Paul Geaneotes、Ruihan Wang、Peng Liu、Yi‐Ming Wang
DOI:10.1002/anie.202006278
日期:2020.9.14
available precursors remains a synthetic challenge. The metal‐free hydrofluorination of alkynes constitutes an attractive though elusive strategy for their preparation. Introduced here is an inexpensive and easily handled reagent that enables the development of simple and scalable protocols for the regioselective hydrofluorination of alkynes to access both the E and Z isomers of vinyl fluorides. These
Radical Amido‐ and Azido‐Fluorination of
<i>α</i>
‐Fluorostyrene Derivatives: An Innovative Approach Towards
<i>β</i>
‐Aryl‐
<i>β</i>
,
<i>β</i>
‐difluoroamino Motifs
AbstractAn innovative one‐step synthesis towards β‐aryl‐β,β‐difluorocarbamates and β‐aryl‐β,β‐difluoroazides is presented. The described approach relies on the use of α‐fluorostyrene substrates in a radical addition/fluorination reaction with N‐centered radicals in the presence of Selectfluor®. The best results were obtained for the azidofluorination reaction. The resultant β‐aryl‐β,β‐difluoroazides were further transformed into Nitrogen‐based heterocycles (e. g. pyrrole, triazole, and tetrazole) and in more elaborated azide derivatives.