- Synthesis of sulfimides and N-Allyl-N-(thio)amides by Ru(II)catalyzed nitrene transfer reactions of N-acyloxyamides
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The N-acyloxyamides were employed as effective N-acyl nitrene precursors in reactions with thioethers under the catalysis of a commercially available Ru(II) complex, from which a variety of sulfimides were synthesized efficiently and mildly. If an allyl group is contained in the thioether precursor, the [2,3]-sigmatropic rearrangement of the sulfimide occurs simultaneously and the N-allyl-N-(thio)amides were obtained as the final products. Preliminary mechanistic studies indicated that the Ru-nitrenoid species should be a key intermediate in the transformation.
- Zhang, Xinyu,Lin, Bo,Chen, Jianhui,Chen, Jiajia,Luo, Yanshu,Xia, Yuanzhi
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supporting information
p. 819 - 825
(2021/02/01)
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- Yb(iii)-catalysedsyn-thioallylation of ynamides
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Reported herein is asyn-thioallylation of ynamides incorporating a sulfide moiety at the α-position and an allyl group at the β-position of the ynamide. The transformation is successful under ytterbium(iii)-catalysis, providing access to highly substituted thioamino-skipped-dienes with broad substrate scope. Thus, tetrasubstituted olefins (with four different functional groups: amide, phenyl, thioaryl/alkyl, and allyl on the carbon centers) are made in a single step from readily accessible ynamides, preserving complete atom economy. The reaction can be extended to the synthesis of selenoamino dienes by ynamidesyn-selenoallylation. DFT studies and control experiments provide insight into the reaction mechanism.
- Dutta, Shubham,Gandon, Vincent,Gogoi, Manash Protim,Mallick, Rajendra K.,Prabagar, B.,Sahoo, Akhila K.,Vanjari, Rajeshwer,Yang, Shengwen
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supporting information
p. 7521 - 7524
(2021/08/05)
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- Enantioselective Synthesis of 3-Fluorochromanes via Iodine(I)/Iodine(III) Catalysis
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The chromane nucleus is common to a plenum of bioactive small molecules where it is frequently oxidized at position 3. Motivated by the importance of this position in conferring efficacy, and the prominence of bioisosterism in drug discovery, an iodine(I)/iodine(III) catalysis strategy to access enantioenriched 3-fluorochromanes is disclosed (up to 7:93 e.r.). In situ generation of ArIF2 enables the direct fluorocyclization of allyl phenyl ethers to generate novel scaffolds that manifest the stereoelectronic gauche effect. Mechanistic interrogation using deuterated probes confirms a stereospecific process consistent with a type IIinv pathway.
- Daniliuc, Constantin G.,Gilmour, Ryan,Neufeld, Jessica,Sarie, Jér?me C.,Thiehoff, Christian
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supporting information
p. 15069 - 15075
(2020/06/17)
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- Hemin Catalyzed Dealkylative Intercepted [2, 3]-Sigmatropic Rearrangement Reactions of Sulfonium Ylides with 2, 2, 2-Trifluorodiazoethane
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A dealkylative intercepted [2, 3]-sigmatropic rearrangement reaction of allylic sulfides with 2, 2, 2-trifluorodiazoethane (CF3CHN2) is reported, the commercially available and biocompatible catalyst hemin was found to efficiently catalyze this transformation across a diverse set of allylic sulfides with in situ generated CF3CHN2, providing excellent yields (up to 99%) under mild condition without inert gas protection. In addition, CF3CHN2 exhibited unique reactivity toward this process compared with other frequently used diazo reagents. This work expands the range of carbene-mediated transformations catalyzed by hemin and introduces a concise and general strategy for exploiting new possibility of reactions concerning organosulfides. (Figure presented.).
- Yan, Xiaojing,Li, Chang,Xu, Xiaofei,Zhao, Xiaoyong,Pan, Yuanjiang
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supporting information
p. 2005 - 2011
(2020/05/18)
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- Ruthenium-catalyzed decarboxylative C-S cross-coupling of carbonothioate: synthesis of allyl(aryl)sulfide
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A novel ruthenium-catalyzed decarboxylative cross-coupling of carbonothioate is disclosed. This method provides straightforward access to the corresponding allyl(aryl)sulfide derivatives in generally good to excellent yields under mild conditions and feat
- Zheng, Ren-Hua,Guo, Hai-Chang,Chen, Ting-Ting,Huang, Qing,Huang, Guo-Bo,Jiang, Hua-Jiang
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p. 25123 - 25126
(2018/07/29)
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- Aqueous hemin catalyzed sulfonium ylide formation and subsequent [2,3]-sigmatropic rearrangements
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A mild hemin catalytic system for sulfonium ylide generation via a metal carbenoid and a subsequent [2,3]-sigmatropic rearrangement reaction in aqueous solvent is well-established, with the assistance of cyclodextrin (CD) and Triton X-100. The protocol displays high catalytic activity with a broad substrate scope of aryl/alkyl allyl sulfides and diazo reagents, affording homoallyl sulfide products in up to 99% yield. Notably, this catalytic system is successful for water-insoluble allyl sulfides but ineffective for allyl amines or allyl ethers. Moreover, an unprecedented cascade reaction of sulfonium ylide formation, [2,3]-sigmatropic rearrangement and C-H insertion was reported.
- Xu, Xiaofei,Li, Chang,Tao, Zhihao,Pan, Yuanjiang
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supporting information
p. 1245 - 1249
(2017/08/15)
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- Alkynes as masked ylides: Gold-catalysed intermolecular reactions of propargylic carboxylates with sulfides
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The in situ-generation of sulfur ylides by the gold-catalysed rearrangement of propargylic carboxylates in the presence of sulfides has resulted in highly efficient and novel transformations. The Royal Society of Chemistry.
- Davies, Paul W.,Albrecht, Sebastien J.-C.
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p. 238 - 240
(2008/03/12)
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- One-pot synthetic method of allyl sulfides: Samarium-induced allyl bromide mediated reduction of alkyl thiocyanates and diaryl disulfides in methanolic medium
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A convenient synthetic method of allyl sulfides by the treatment of alkyl thiocyanates or diaryl disulfides with Sm and allyl bromide in methanol has been developed.
- Zhan, Zhuang-Ping,Lang, Kai
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p. 1370 - 1371
(2007/10/03)
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