Process for preparing dihalovinylcyclopropanecarboxylates
申请人:Sagami Chemical Research Center
公开号:US04214097A1
公开(公告)日:1980-07-22
Novel syntheses of dihalovinylcyclopropanecarboxylates, including potent insecticides, are described. The processes begin with the reaction between an alkenol and an orthoester to produce a .gamma.-unsaturated carboxylate, followed by the catalyzed addition of a carbon tetrahalide to the double bond and dehydrohalogenation to produce a cyclopropane derivative.
On the Selectivity in the Synthesis of 3-Fluoropiperidines Using BF<sub>3</sub>-Activated Hypervalent Iodine Reagents
作者:Radoslav Z. Pavlović、Tatjana J. Kop、Marko Nešić、Olivera Stepanović、Xiuze Wang、Nina Todorović、Marko V. Rodić、Biljana M. Šmit
DOI:10.1021/acs.joc.3c00944
日期:2023.8.4
reaction mechanism. In brief, we propose that BF3-coordinated I(III) reagents attack C═C to produce the corresponding iodiranium(III) ion, which then undergoes diastereodetermining 5-exo-cyclization. Transiently formed pyrrolidines with an exocyclic σ-alkyl-I(III) moiety can further undergo aziridinium ion formation or reductive ligand coupling processes, which dictate not only the final product’s ring