- Nickel(0)-Catalyzed Asymmetric Ring Expansion Toward Enantioenriched Silicon-Stereogenic Benzosiloles
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The development of a straightforward strategy to obtain enantioenriched silicon-stereogenic benzosiloles remains a challenging yet appealing synthesis venture due to their potential future application in chiral electronic and optoelectronic devices. In this context, all of the existing methods rely on Rh-catalyzed systems and are somewhat limited in scope. Herein, we disclose the first Ni0-catalyzed ring expansion process that enables the preparation of benzosiloles possessing tetraorganosilicon stereocenters in excellent yields and enantioselectivities. The presented catalysis strategy is further applied to the asymmetric synthesis of silicon-stereogenic bis-silicon-bridged π-extended systems. Preliminary studies reveal that such compounds exhibit fluorescence emission, Cotton effects and circularly polarized luminescence (CPL) activity.
- Ju, Cheng-Wei,Yan, Nuo,Zhang, Jinyu,Zhao, Dongbing
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supporting information
p. 25723 - 25728
(2021/11/09)
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- Facile access to 2,2-diaryl 2: H -chromenes through a palladium-catalyzed cascade reaction of ortho -vinyl bromobenzenes with N -tosylhydrazones
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A palladium-catalyzed cascade reaction of ortho-vinyl bromobenzenes with N-tosylhydrazones has been developed, which provides a facile approach to 2,2-disubstituted 2H-chromenes. The migration of palladium from the aryl to vinyl position is crucial, as the in situ produced vinyl palladium intermediate could further react with diazo compounds to generate the reactive species for the sequential annulation. This journal is
- Huang, Xueliang,Yu, Yinghua,Zhang, Heng
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supporting information
p. 5115 - 5119
(2020/07/23)
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- Ni-Catalyzed Cyclization of Enynes and Alkynylboronates: Atom-Economical Synthesis of Boryl-1,4-dienes
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We report a novel atom-economical Ni-catalyzed cyclization reaction of enynes with alkynylboronates. The reaction employs a non-expensive Ni salt, a phosphine-based ligand and easy-handling alkynylboronates as boron–carbon source. The reaction provides co
- Cabrera-Lobera, Natalia,Quirós, M. Teresa,Bu?uel, Elena,Cárdenas, Diego J.
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supporting information
p. 14512 - 14516
(2019/11/11)
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- Rhodium(iii) vs. cobalt(iii): a mechanistically distinct three-component C-H bond addition cascade using a Cp*RhIII catalyst
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Three-component C-H bond additions across two different coupling partners remain underdeveloped. Herein, we report the first three-component RhIII-catalyzed C-H bond additions to a wide range of dienes and aldehydes. Our method constitutes a complementary access with Ellman's CoIII-catalytic system to homoallylic alcohols.
- Li, Ruirui,Ju, Cheng-Wei,Zhao, Dongbing
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supporting information
p. 695 - 698
(2019/01/29)
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- Chlorination of phenylallene derivatives with 1-chloro-1,2-benziodoxol-3-one: Synthesis of vicinal-dichlorides and chlorodienes
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Allyl and vinyl chlorides represent important structural motifs in organic chemistry. Herein is described the chemoselective and regioselective reaction of aryl- and α-substituted phenylallenes with the hypervalent iodine (HVI) reagent 1-chloro-1,2-benz-iodoxol-3-one. The reaction typically results in vicinal dichlorides, except with proton-containing α-alkyl substituents, which instead give chlorinated dienes as the major product. Experimental evidence suggests that a radical mechanism is involved.
- Zhao, Zhensheng,Murphy, Graham K.
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supporting information
p. 796 - 802
(2018/04/16)
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- Fluorinative Rearrangements of Substituted Phenylallenes Mediated by (Difluoroiodo)toluene: Synthesis of α-(Difluoromethyl)styrenes
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Phenylallenes undergo fluorinative rearrangement upon the action of (difluoroiodo)toluene in the presence of 20 mol % BF3?OEt2 to yield α-difluoromethyl styrenes. This unprecedented reaction was entirely chemoselective for the internal allene π bond, and showed remarkable regioselectivity during the fluorination event. Substituted phenylallenes, phenylallenes possessing both phenyl- and α-allenyl substituents, and diphenylallenes were investigated, and good functional-group compatibility was observed throughout. The ease with which allenes can be prepared on a large scale, and the operational simplicity of this reaction allowed us to rapidly access fluorine-containing building blocks that have not been accessed by conventional deoxyfluorination strategies.
- Zhao, Zhensheng,Racicot, Léanne,Murphy, Graham K.
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supporting information
p. 11620 - 11623
(2017/09/11)
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- Directing-group-assisted copper-catalyzed olefinic trifluoromethylation of electron-deficient alkenes
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Assistance provided: The directing group in the title reaction not only activates the substrates but also allows the stereospecific formation of cis-trifluoromethylated products. The reaction is operationally simple and tolerates a wide variety of functional groups, thus providing an efficient method for the stereoselective synthesis of β-CF3-functionalized acrylamide derivatives. Copyright
- Feng, Chao,Loh, Teck-Peng
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supporting information
p. 122414 - 122417
(2013/12/04)
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- Scope and mechanism of allylic C-H amination of terminal alkenes by the palladium/PhI(OPiv)2 catalyst system: Insights into the effect of naphthoquinone
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Palladium-catalyzed oxidative amination of unactivated alkyl olefins has been developed to produce linear (E)-allylimides with high regioselectivity. This highly efficient transformation of alkenes has been achieved by enhancing the reoxidation of palladi
- Yin, Guoyin,Wu, Yichen,Liu, Guosheng
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supporting information; experimental part
p. 11978 - 11987
(2010/11/02)
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- 17-Desoxy Estrogen Analogues
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A series of 17-substituted, 17-desoxyestratrienes have been synthesized and tested as potential postcoital antifertility agents.Estrogen-relative binding affinities were determined, in vivo assays for estrogenic and postcoital antifertility activity were
- Peters, Richard H.,Crowe, David F.,Avery, Mitchell A.,Chong, Wesley K. M.,Tanabe, Masato
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p. 1642 - 1652
(2007/10/02)
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