The copper(II)-catalyzed (4+1) cyclizations and copper(I)-catalyzed (3+2) cycloadditions of iodonium ylides and alkynes were successfully developed by employing efficient and safe iodonium ylides instead of traditional diazo compounds. Highly functionalized dimethyl (E)-3-benzylideneindoline-2,2-dicarboxylates and methyl 5-(2-hydroxyphenyl)-2-methoxy-4-phenylfuran-3-carboxylates were conveniently prepared
Metal-free intermolecular cyclopropanation between alkenes and iodonium ylides mediated by PhI(OAc)<sub>2</sub>·Bu<sub>4</sub>NI
作者:Jason Tao、Carl D. Estrada、Graham K. Murphy
DOI:10.1039/c7cc04859a
日期:——
A rapid, mild and metal-freeintermolecular cyclopropanation between iodonium ylides and alkene-containing substrates mediated by PhI(OAc)2·Bu4NI is reported. Iodonium ylides of cyclic and acyclic 1,3-dicarbonyls were reacted with a variety of mono-, di-, tri- and tetra-substituted alkenes of various structural types to give 29 cyclopropanes in up to 97% yield.
Iodide-Mediated Synthesis of Spirooxindolo Dihydrofurans from Iodonium Ylides and 3-Alkylidene-2-oxindoles
作者:Benjamin A. Laevens、Jason Tao、Graham K. Murphy
DOI:10.1021/acs.joc.7b01639
日期:2017.11.17
An iodide-mediated reaction between cyclic iodonium ylides of 1,3-dicarbonyls and 3-alkylidene-2-oxindoles results in 3H-spiro[furan-2,3′-indolin]-2′-ones. The reaction was tolerant to substitutions on both the alkylidene and ylide substrates and provided access to 19 new, densely functionalized polycyclic spirocycles in typically high yield.
Synthesis of 2-alkenylfurans <i>via</i> a Ag(<scp>i</scp>)-catalyzed tandem cyclization/cross-coupling reaction of enynones with iodonium ylides
作者:Haiyun Peng、Yinbo Wan、Yu Zhang、Guisheng Deng
DOI:10.1039/c9cc08561k
日期:——
A silver(i)-catalyzedtandem cyclization/cross-coupling reaction of enynones with iodonium ylides to construct carbon-carbon double bonds has been developed. The strategy provides a novel method for the synthesis of 2-alkenylfurans. This is the first cross-coupling reaction between metal-carbene complexes and iodonium ylides.
No-Carrier-Added Nucleophilic [F-18] Fluorination of Aromatic Compounds
申请人:Satyamurthy Nagichettiar
公开号:US20120123120A1
公开(公告)日:2012-05-17
Phenyliodonium ylide derivatives substituted with electron donating as well as electron withdrawing groups on the aromatic ring are shown for use as precursors in aromatic nucleophilic substitution reactions. The iodonium ylide group is substituted by nucleophiles such as halide ions to provide the corresponding haloaryl derivatives. No-carrier-added [F-18]fluoride ion exclusively substitutes the iodonium ylide moiety in these derivatives and provides high specific activity F-18 labeled fluoro derivatives. Protected L-dopa-6-iodonium ylide derivative have been synthesized as a precursors for the preparation of no-carrier-added 6-[F-18]fluoro-L-dopa. The iodonium ylide group in this L-dopa.derivative is nucleophilically substituted by no-carrier-added [F-18]fluoride ion to provide a [F-18]fluoro intermediates which upon acid hydrolysis yielded 6-[F-18]fluoro-L-dopa.