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Mizumori T, Hata T, Urabe H. Alkylation of Pyridines at Their 4-Positions with Styrenes plus Yttrium Reagent or Benzyl Grignard Reagents. Chemistry 2014; 21:422-6. [DOI: 10.1002/chem.201404635] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Indexed: 11/08/2022]
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Wang L, Xie X, Liu Y. Facile Synthesis of Fully Substituted Dihydro-β-carbolines via Brønsted Acid Promoted Cascade Reactions of α-Indolyl Propargylic Alcohols with Nitrones. Org Lett 2012; 14:5848-51. [DOI: 10.1021/ol302695p] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lu Wang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, People’s Republic of China
| | - Xin Xie
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, People’s Republic of China
| | - Yuanhong Liu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, People’s Republic of China
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Cai M, Chen J, Huang X, Liu M, Ding J, Wu H. Synthesis of fluorinated β-carbolines by one-pot reaction. JOURNAL OF CHEMICAL RESEARCH 2008. [DOI: 10.3184/030823408x380740] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This paper describes a new strategy for the synthesis of 1-trifluoromethyl-9H-pyrido [3,4-b]indole 2 by one-pot reaction of tryptophan methyl ester hydrochloride 1 and trifluoroacetic anhydride (TFAA) in the presence of POCI3 with satisfactory yield. Additionally, the structure of 2b was confirmed by X-ray crystallographic analysis.
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Affiliation(s)
- Mingtiao Cai
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325027, P. R. China
| | - Jiuxi Chen
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325027, P. R. China
| | - Xiaobo Huang
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325027, P. R. China
| | - Miaochang Liu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325027, P. R. China
| | - Jinchang Ding
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325027, P. R. China
- Wenzhou Vocational and Technical College, Wenzhou, 325035, P. R. China
| | - Huayue Wu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325027, P. R. China
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Bonneau AL, Robert N, Hoarau C, Baudoin O, Marsais F. A new synthetic approach to biaryls of the rhazinilam type. Application to synthesis of three novel phenylpyridine-carbamate analogues. Org Biomol Chem 2007; 5:175-83. [PMID: 17164923 DOI: 10.1039/b613173e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of three novel racemic phenylpyridine-carbamate analogues of rhazinilam and their biological evaluation as inhibitors of microtubule assembly and disassembly by interaction with tubulin are described. The sterically hindered ortho-disubstituted biaryl unit as the challenging key structural element is first obtained by a sequential regiocontrolled nucleophilic addition of a lithium ortho-lithiohomobenzylic alkoxide species to 3-bromo-5-oxazolyl pyridine as the electrophile and a subsequent oxidation step. The incorporation of the amino group by replacement of the bromide has been achieved using a Buchwald-Hartwig amination coupling. Ultimate deprotection steps furnished free-amino and free-hydroxyl appendages which were connected by phosgenation to furnish the nine-membered median carbamate ring.
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Affiliation(s)
- Anne-Laure Bonneau
- Laboratoire de Chimie Organique Fine et Hétérocyclique UMR 6014, Université et INSA de Rouen, Place E. Blondel, 76131, Mont Saint Aignan, France
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Hoffmann-Emery F, Hilpert H, Scalone M, Waldmeier P. Efficient Synthesis of Novel NK1Receptor Antagonists: Selective 1,4-Addition of Grignard Reagents to 6-Chloronicotinic Acid Derivatives. J Org Chem 2006; 71:2000-8. [PMID: 16496986 DOI: 10.1021/jo0523666] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new efficient synthesis of two novel classes of NK1 receptor antagonists, among them befetupitant and netupitant, starting from 6-chloronicotinic acid is described. The introduction of the o-tolyl substituent at C4 of the pyridine ring was achieved by a one-pot selective 1,4-Grignard addition/oxidation sequence to 6-chloronicotinic acid or a derivative of it. The scope of this addition/oxidation sequence was examined. It was also shown that the carboxylic function can be converted to a methyl amino group by a Hofmann rearrangement followed by reduction. Furthermore, a new high-yielding synthesis of 2-(3,5-bistrifluoromethylphenyl)-2-methyl propionic acid based on the carbonylation of the tertiary alcohol obtained by Grignard addition of 3,5-bis(trifluoromethyl)bromobenzene to acetone was established.
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Affiliation(s)
- Fabienne Hoffmann-Emery
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, Safety & Technical Sciences, Synthesis & Process Research, Grenzacherstrasse 124, CH-4070 Basel, Switzerland.
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Barberis C, Gordon TD, Thomas C, Zhang X, Cusack KP. Cu(I)-catalyzed intramolecular cyclization of ene-carbamates: synthesis of indoles and pyrrolo[2,3-c]pyridines. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.10.077] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bayh O, Awad H, Mongin F, Hoarau C, Bischoff L, Trécourt F, Quéguiner G, Marsais F, Blanco F, Abarca B, Ballesteros R. Deprotonation of benzoxazole and oxazole using lithium magnesates. J Org Chem 2005; 70:5190-6. [PMID: 15960523 DOI: 10.1021/jo050493w] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first deprotonations of oxazole and benzoxazole using lithium magnesates are described. The reactions occurred in tetrahydrofuran at room temperature using 1/3 equiv of lithium tributylmagnesate. As 2-lithiooxazole and 2-lithiobenzoxazole, lithium tri(2-oxazolyl)magnesate and lithium tri(2-benzoxazolyl)magnesate very rapidly and completely isomerized to the more stable 2-(isocyano)enolate and 2-(isocyano)phenolate type structures, respectively, a result shown by NMR analysis. The isolation of 2-substituted oxazoles and benzoxazoles in medium to good yields after electrophilic trapping was interpreted in two ways: (1) the equilibration between the open and closed structures is faster than the trapping of the open isomers, and the closed isomers are more reactive than the open ones, or (2) the open isomers react with electrophiles in a intramolecular Passerini type reaction. The nonreactivity of the 2-(isocyano)enolate type structure toward anisaldehyde in the absence of lithium bromide makes the intramolecular Passerini type reaction more plausible.
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Affiliation(s)
- Omar Bayh
- Laboratoire de Chimie Organique Fine et Hétérocyclique, UMR 6014, IRCOF, CNRS, Université et INSA de Rouen, Place E. Blondel BP 08, 76131 Mont-Saint-Aignan Cedex, France
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Ding J, Gao J, Wu H, Huang X, Yuan C. Novel Synthetic Route to Fluorinated β‐Carbolines by One‐Pot Reaction. SYNTHETIC COMMUN 2005. [DOI: 10.1081/scc-200049769] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Wang S, Dong Y, Wang X, Hu X, Liu JO, Hu Y. 3-Aryl β-carbolin-1-ones as a new class of potent inhibitors of tumor cell proliferation: synthesis and biological evaluation. Org Biomol Chem 2005; 3:911-6. [PMID: 15731878 DOI: 10.1039/b412921k] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel three-step synthesis of 3-aryl beta-carbolin-1-ones from non-indole starting materials has been developed. The two nitrogen atoms in beta-carbolin-1-one were introduced efficiently by Michael addition of ethyl acetamidocyanoacetate to chalcone. The desired pyridone and indole rings were assembled by an intramolecular ketone-nitrile annulation mediated by aqueous HCl-HOAc and a Cu(I)-catalyzed intramolecular N-arylation of the amide, respectively. The target compounds were found to possess significant activity against tumor cell proliferation.
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Affiliation(s)
- Shaozhong Wang
- Department of Chemistry, Tsinghua University, Beijing, 100084, P R China
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Awad H, Mongin F, Trécourt F, Quéguiner G, Marsais F. Deprotonation of chloropyridines using lithium magnesates. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.08.151] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Awad H, Mongin F, Trécourt F, Quéguiner G, Marsais F, Blanco F, Abarca B, Ballesteros R. Deprotonation of fluoro aromatics using lithium magnesates. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.07.077] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wang S, Sun J, Yu G, Hu X, Liu JO, Hu Y. CuI catalyzed N-arylation of amide as a key step for the preparation of 3-aryl β-carbolin-1-ones. Org Biomol Chem 2004; 2:1573-4. [PMID: 15162205 DOI: 10.1039/b406046f] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An expedient synthetic route for 3-aryl beta-carbolin-1-ones was developed starting from ethyl acetamidocyanoacetate and chalcone derivatives. The five- and six-membered nitrogen-containing rings in the beta-carbolin-1-ones were elaborated efficiently by an intramolecular ketone-nitrile annulation and an intramolecular N-arylation of amide respectively.
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Affiliation(s)
- Shaozhong Wang
- Department of Chemistry, Nanjing University, Nanjing 210093, PR China
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Ihara M, Fukumoto K. Recent progress in the chemistry of non-monoterpenoid indole alkaloids. Nat Prod Rep 1997. [DOI: 10.1039/np9971400413] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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