Deoxygenative <i>gem</i>-difluoroolefination of carbonyl compounds with (chlorodifluoromethyl)trimethylsilane and triphenylphosphine
作者:Fei Wang、Lingchun Li、Chuanfa Ni、Jinbo Hu
DOI:10.3762/bjoc.10.32
日期:——
phosphonium ylide represents one of the most straightforward methods. RESULTS: The combination of (chlorodifluoromethyl)trimethylsilane (TMSCF2Cl) and triphenylphosphine (PPh3) can be used for the synthesis of gem-difluoroolefins from carbonyl compounds. Comparative experiments demonstrate that TMSCF2Cl is superior to (bromodifluoromethyl)trimethylsilane (TMSCF2Br) and (trifluoromethyl)trimethylsilane
Metal dehalogenation route to reactive fluoroolefins
作者:D.J. Burton、H.S. Kesling、D.G. Naae
DOI:10.1016/s0022-1139(00)82620-2
日期:1981.9
Metal dehalogenation of bromodifluoromethyltriphenylphosphonium bromide with Cd, Zn, or Hg provides a practical route to fluoroolefins that contain an allylic halogen or a pentafluorophenyl group. No SN2′ or ring substituted products are observed.
The invention provides a substituted benzylaminopiperidine compounds that are useful in the treatment of gastrointestinal disorders; central nervous system (CNS) disorders; inflammatory disease; emesis; urinary incontinence; pain; migraine; sunburn; diseases, disorders and adverse conditions caused by Heliobacter pylori; or angiogenesis, especially CNS disorders in a mammalian subject, especially in humans.
Chain-extension reactions via insitu capture of the dibromofluoromethide ion with difluoromethylene fluoro-olefins
作者:Donald Joseph Burton、Steven W. Hansen
DOI:10.3998/ark.5550190.0011.806
日期:——
The insitureaction of triphenylphosphine, tribromofluoromethane, and a difluoromethylene olefin successfully allows the capture of the intermediate dibromofluoromethideion. With fluorinated propenes, the product is an allylic dibromofluoromethyl alkene; with longer chain fluoro-olefins the major product is a 1-bromo-1,3-fluorinated diene derivative. Pentafluoropyridine yields 4-dibromofluorometh
A stereoselective reduction of polyfluorinated olefins. A facile conversion of difluoromethylene olefins to fluoromethylene olefins vinyl phosphoranes and vinyl phosphonium salts
作者:Donald J. Burton、Seiji Shin-ya、Richard D. Howells