Selective Fluorodesulfurization of Benzo- and Pyrido-oxazine Derivatives
作者:Toshio Fuchigami、Bin Yin、Shinsuke Inagi
DOI:10.1055/s-0030-1258517
日期:2010.9
fluorodesulfurization of 3-aryl-2-phenylthio 2H-benzo[b][1,4]oxazine derivatives was successfully carried out using various N-halogenosuccinimides as oxidizing reagent in the presence of Et 3 N·3HF to provide the corresponding monofluorinated products in excellent yields. Selective fluorodesulfurization of the corresponding pyrido[3,2-b][1,4]oxazine derivatives was also achieved similarly.
Selective Electrochemical Fluorodesulfurization of Benzo- and Pyrido-Fused Oxazine Derivatives Using Ex-cell Halogen Mediators
作者:Toshio Fuchigami、Bin Yin、Shinsuke Inagi
DOI:10.1055/s-0030-1260085
日期:2011.8
Although the direct anodic fluorination of 3-phenyl-2H-1,4-benzoxazine was not very effective, the fluorodesulfurization of 3-aryl-2-(phenylsulfanyl)-2H-1,4-benzoxazines using various anodically generated halogen mediators in the presence of triethylamine tris(hydrogen fluoride) by an ex-cell method efficiently and selectively provided the corresponding monofluorinated products. In sharp contrast, in-cell halogen mediators did not work well. Furthermore, the selective fluorodesulfurization of pyrido[3,2-b][1,4]oxazine derivatives was also successfully carried out using the same ex-cell method to provide the corresponding monofluorinated products in moderate yields.