- Nickel-Catalyzed trans-Carboamination across Internal Alkynes to Access Multifunctionalized Indoles
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A Ni-catalyzed reaction was developed for the synthesis of multifunctionalized indoles. The reaction proceeded through oxidative cyclization of the Ni(0)/P^N complex with an enyne system, 2-alkynyl anilinoacrylate, to provide a nickelacycle intermediate. The trans-carboamination around the internal alkyne was achieved by syn/anti-rotation of the Ni-carbenoid intermediate formed by C-N bond cleavage of the nickelacycle, and 3-alkenylated indoles were formed by C-N bond-forming reductive elimination. Notably, the synthesized indoles could be successfully transformed to functionalized carbazoles.
- Tambe, Shrikant D.,Iqbal, Naeem,Cho, Eun Jin
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- Asymmetric Counteranion Directed Catalytic Heck/Tsuji-Trost Annulation of Aryl Iodides and 1,3-Dienes
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A chiral anion-mediated asymmetric Heck/Tsuji-Trost reaction of aryl iodides and 1,3-dienes is presented. Chiral indoline derivatives could be afforded with remarkably higher yields and enantioselectivities than our previous chiral ligand-based method. Silver carbonate is employed as both base and halide scavenger to ensure fast and recyclable exchange of the catalytic amount of chiral anions. Fast salt metathesis, as well as the acceleration effect of the chiral anion, could both benefit the stereocontrol of the reaction.
- Xu, Jia-Cheng,Yin, Yi-Zhuo,Han, Zhi-Yong
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p. 3834 - 3838
(2021/05/26)
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- Palladium-Catalyzed Allenamide Carbopalladation/Allylation with Active Methine Compounds
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A palladium-catalyzed allenamide carbopalladation/allylation with active methine compounds has been developed. Various indoles and isoquinolinones bearing a quaternary carbon center were achieved with good efficiency, a broad substrate scope and good functional group tolerance. This reaction underwent cascade oxidative addition, carbopalladation, and allylic alkylation, and two new C-C bonds were formed in one pot.
- Zhu, Xiaoyi,Li, Ruibo,Yao, Hequan,Lin, Aijun
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p. 4630 - 4634
(2021/06/28)
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- Gold and Br?nsted Acid Catalyzed Spirocyclization of 2- And 3-Indolyl-Tethered 1,4-Enyne Acetates to Spiro[4, n]alkyl[ b]indoles
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A synthetic method to prepare spiro[4,n]alkyl[b]indoles (n = 4-6) efficiently that relies on the gold(I) and Br?nsted acid mediated spirocyclization of 2- and 3-indolyl-tethered 1,4-enyne acetates at room temperature and open to air is described.
- Baratay, Corentin Antoine,Chen, Xiaoyu,Hong Chan, Philip Wai,Mark, Maddison Elizabeth,Xu, Xinfang
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supporting information
(2020/04/02)
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- Organocatalytic Asymmetric Annulation of ortho-Alkynylanilines: Synthesis of Axially Chiral Naphthyl-C2-indoles
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A chiral Br?nsted base catalyzed asymmetric annulation of ortho-alkynylanilines has been developed to access axially chiral naphthyl-C2-indoles via vinylidene ortho-quinone methide (VQM) intermediates. This strategy provides a unique organocatalytic atrop
- Peng, Lei,Li, Kai,Xie, Chuandong,Li, Shan,Xu, Da,Qin, Wenling,Yan, Hailong
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supporting information
p. 17199 - 17204
(2019/11/11)
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- Synthesis and optical properties of 2-functionally substituted 4,5-dihydrothieno[3,2-c]quinolines
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N-Protected 4-(anilinomethyl)thiophene-2-carbaldehydes were prepared by the reaction of easily available 4-chloromethylthiophene-2-carbaldehyde with N-(2-halogenophenyl) substituted acetamides, 4-methylbenzenesulfonamides and carbamates in the presence of K2CO3 or Cs2CO3. The compounds obtained were converted to 4,5-dihydrothieno [3,2-c]quinoline-2-carbaldehydes by palladium catalyzed intramolecular cyclization in homogenous or heterogenous (Pd/C) conditions with good yields and subsequently used for preparing of 2-functionally substituted thieno [3,2-c]quinoline derivatives (nitriles, carboxamides, carboxylic acids, esters). The optical properties of 2-functionally substituted thieno[3,2-c]quinolines and 4H-thieno[3,2-c]chromenes have been studied. Moderate to high fluorescence quantum yields are observed for these compounds ranging from 0.15 to 0.87. Structure - optical properties relationships have been established for the compounds synthesized, and their prospective application as invisible ink dyes was practically demonstrated.
- Bogza, Yulia P.,Rastrepin, Alexey A.,Nider, Victoria V.,Zheleznova, Tatyana Yu,Stasyuk, Anton J.,Kurowska, Aleksandra,Laba, Katarzyna,Ulyankin, Evgeny B.,Domagala, Wojciech,Fisyuk, Alexander S.
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p. 419 - 428
(2018/07/13)
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- Parallel strategies for the synthesis of annulated pyrido[3,4-b]indoles via Rh(I)- and Pd(0)-catalyzed cyclotrimerization
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Two different pathways for the synthesis of annulated pyrido[3,4-b]indoles are reported using metal-catalyzed cyclotrimerization reactions. A stepwise process using Rh(I)-catalysis in the final step of the synthesis and a multicomponent, tandem catalytic
- Saliba, Bianca M.,Khanal, Satyam,O'Donnell, Michael A.,Queenan, Kathryn E.,Song, Junho,Gentile, Matthew R.,Mulcahy, Seann P.
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p. 4311 - 4314
(2018/11/03)
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- Dehydrogenation of N-Heterocycles by Superoxide Ion Generated through Single-Electron Transfer
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Nitrogen-containing heteroarene motifs are found in numerous pharmaceuticals, natural products, and synthetic materials. Although several elegant methods for synthesis of these compounds through dehydrogenation of the corresponding saturated heterocycles have been reported, some of the methods are hampered by long reaction times, harsh conditions, and the need for catalysts that are not readily available. This work reports a novel method for dehydrogenation of N-heterocycles. Specifically, O2.? generated in situ acts as the oxidant for N-heterocycle substrates that are susceptible to oxidation through a hydrogen atom transfer mechanism. This method provides a general, green route to N-heteroarenes.
- Huang, Yuan-Qiong,Song, Hong-Jian,Liu, Yu-Xiu,Wang, Qing-Min
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supporting information
p. 2065 - 2069
(2018/01/27)
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- Pd-catalyzed cascade reactions between: O -iodo- N -alkenylanilines and tosylhydrazones: Novel approaches to the synthesis of polysubstituted indoles and 1,4-dihydroquinolines
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Two different Pd-catalyzed cascade reactions between o-iodo-N-alkenylanilines and tosylhydrazones are described. The outcome of the cascade processes is determined by the substitution on the N-alkenyl fragment. The reactions with N-tosyl-N-ethylene-o-iodoanilines lead to indoles through a sequence that involves the sequential migratory insertions of a carbene ligand and a C-C double bond, featuring a 5-exo-trig cyclization. The reactions with N-alkyl-N-alkenyl-o-iodoanilines provide 1,4-dihydroquinolines through a cascade reaction that includes a formal 6-endo-trig cyclization. In both cases the benzofused heterocycles are built through the formation of two C-C bonds on the hydrazonic carbon atom.
- Paraja, Miguel,Valdés, Carlos
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supporting information
p. 6312 - 6315
(2016/05/19)
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- Tris(trimethylsilyl)silane and visible-light irradiation: A new metal- and additive-free photochemical process for the synthesis of indoles and oxindoles
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A combined tris(trimethylsilyl)silane and visible-light-promoted intramolecular reductive cyclization protocol for the synthesis of indoles and oxindoles has been developed. This straightforward and efficient method shows tolerance towards a broad spectru
- Da Silva, Gustavo Piva,Ali, Akbar,Da Silva, Rodrigo César,Jiang, Hao,Paix?o, Márcio W.
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supporting information
p. 15110 - 15113
(2015/10/12)
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- An approach to cyclohepta[ b ]indoles through an allenamide (4 + 3) cycloaddition-grignard cyclization-chugaev elimination sequence
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A strategy for synthesizing highly functionalized cyclohepta[b]indoles through a concise (4 + 3) cycloaddition-cyclization-elimination sequence is described. The cycloaddition features nitrogen-stabilized oxyallyl cations derived from epoxidations of N-ar
- He, Shuzhong,Hsung, Richard P.,Presser, William R.,Ma, Zhi-Xiong,Haugen, Bryan J.
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supporting information
p. 2180 - 2183
(2014/05/06)
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- Palladium-catalyzed intramolecular reductive cross-coupling of Csp 2-Csp3 bond formation
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A Pd-catalyzed efficient reductive cross-coupling reaction without metallic reductant to construct a Csp2-Csp3 bond has been reported. A PdIV complex was proposed to be a key intermediate, which subsequently went through d
- Liu, Hui,Wei, Jianpeng,Qiao, Zongjun,Fu, Yana,Jiang, Xuefeng
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supporting information
p. 8308 - 8313
(2014/07/08)
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- Spiro heterocycles as potential inhibitors of SIRT1: Pd/C-mediated synthesis of novel N-indolylmethyl spiroindoline-3,2′-quinazolines
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Novel N-indolylmethyl substituted spiroindoline-3,2′-quinazolines were designed as potential inhibitiors of SIRT1. These compounds were synthesized in good yields by using Pd/C-Cu mediated coupling-cyclization strategy as a key step involving the reaction of 1-(prop-2-ynyl)-1′H- spiro[indoline-3,2′-quinazoline]-2,4′(3′H)-dione with 2-iodoanilides. Some of the compounds synthesized have shown encouraging inhibition of Sir 2 protein (a yeast homologue of mammalian SIRT1) in vitro and three of them showed dose dependent inhibition of Sir 2. The docking results suggested that the benzene ring of 1,2,3,4-tetrahydroquinazolin ring system of these molecules occupied the deep hydrophobic pocket of the protein and one of the NH along with the sulfonyl group participated in strong H-bonding interaction with the amino acid residues.
- Rambabu,Raja, Guttikonda,Yogi Sreenivas,Seerapu,Lalith Kumar,Deora, Girdhar Singh,Haldar, Devyani,Rao, M.V.Basaveswara,Pal, Manojit
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supporting information
p. 1351 - 1357
(2013/03/14)
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