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Xu LC, Ma XD, Liu KM, Duan XF. Chemo- and Regioselective Alkylation of Pyridine N-Oxides with Titanacyclopropanes. Org Lett 2023. [PMID: 38016093 DOI: 10.1021/acs.orglett.3c03469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Abstract
While titanacyclopropanes are used to react mainly with ester, amide, and cyano to undergo cyclopropanation, herein they react preferentially with pyridine N-oxide to accomplish C2-H alkylation beyond these functionalities with double regioselectivity. After being pyridylated at the less hindered C-Ti bond, the remaining C-Ti bond of titanacyclopropanes can be further functionalized by various electrophiles, allowing facile introduction of complex alkyls onto the C2 of pyridines. Its synthetic potential has been demonstrated by late-stage diversification of drugs.
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Affiliation(s)
- Li-Chen Xu
- College of Chemistry, Beijing Normal University, Beijing 100875, P.R. China
| | - Xiao-Di Ma
- College of Chemistry, Beijing Normal University, Beijing 100875, P.R. China
| | - Kun-Ming Liu
- College of Chemistry, Beijing Normal University, Beijing 100875, P.R. China
| | - Xin-Fang Duan
- College of Chemistry, Beijing Normal University, Beijing 100875, P.R. China
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2
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Torres Domínguez HM, Hernández Villaverde LM, Le Lagadec R. Recent Advances on O-Ethoxycarbonyl and O-Acyl Protected Cyanohydrins. Molecules 2021; 26:4691. [PMID: 34361844 PMCID: PMC8347998 DOI: 10.3390/molecules26154691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/28/2021] [Accepted: 07/29/2021] [Indexed: 11/17/2022] Open
Abstract
Ethoxycarbonyl cyanohydrins and O-acyl cyanohydrins are examples of O-protected cyanohydrins in which the protecting group presents an electrophilic center, contributing to additional reaction pathways. The first section of this review describes recent advances on the synthesis of O-ethoxycarbonyl and O-acyl protected cyanohydrins. Reactions using KCN or alkyl cyanoformates as the cyanide ion source are described, as well as organic and transition metal catalysis used in their preparation, including asymmetric cyanation. In a second part, transformations, and synthetic applications of O-ethoxycarbonyl/acyl cyanohydrins are presented. A variety of structures has been obtained starting from such protected cyanohydrins and, in particular, the synthesis of oxazoles, 1,4-diketones, 1,3-diketones, 2-vinyl-2-cyclopentenones through various methods are discussed.
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Affiliation(s)
| | | | - Ronan Le Lagadec
- Instituto de Química, UNAM, Circuito Exterior s/n, Ciudad Universitaria, Coyoacán, Ciudad de México 04510, Mexico; (H.M.T.D.); (L.M.H.V.)
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3
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Affiliation(s)
- Philippe Bertus
- Institut des Molécules et Matériaux du Mans (IMMM), UMR 6283 CNRS, Le Mans Université, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France
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4
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Wang D, Lu B, Song YL, Sun HM, Shen Q. Fe(III)-catalyzed oxidative coupling of alkylnitriles with aromatic carboxylic acids: Facile access to cyanomethyl esters. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.150969] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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5
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Pantin M, Bodinier F, Saillour J, Youssouf YM, Boeda F, Pearson-Long MS, Bertus P. Convenient and easy access to 2-hydroxycyclopent-2-enones from acylcyanohydrins. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.07.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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6
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Caillé J, Boukattaya F, Boeda F, Pearson-Long MSM, Ammar H, Bertus P. Successive addition of two different Grignard reagents to nitriles: access to α,α-disubstituted propargylamine derivatives. Org Biomol Chem 2018; 16:1519-1526. [PMID: 29419848 DOI: 10.1039/c7ob03047a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The successive addition of two different Grignard reagents to acyl cyanohydrins was performed with success by taking advantage of the low reactivity of alkynyl Grignard reagents. The experimental conditions were adjusted so that they were not reactive during the first addition step, but reactive only in the second one. The synthetic utility of the prepared compounds was validated by the preparation of chiral quaternary α-amino acids.
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Affiliation(s)
- Julien Caillé
- Le Mans Université (Université du Maine), CNRS UMR 6283, Institut des Molécules et Matériaux du Mans (IMMM), 72085 Le Mans Cedex 09, France.
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7
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Stepherson JR, Fronczek FR, Kartika R. An expedient synthesis of functionalized 1,4-diketone-derived compounds via silyloxyallyl cation intermediates. Chem Commun (Camb) 2016; 52:2300-3. [DOI: 10.1039/c5cc09763k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Herein we describe the synthesis of highly functionalized 1,4-diketones that are readily differentiated as monosilylenol ethers via direct capture of silyloxyallyl cations by silyl enolates under Brønsted acid catalysis.
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Affiliation(s)
- Jacob R. Stepherson
- Department of Chemistry
- 232 Choppin Hall
- Louisiana State University
- Baton Rouge
- USA
| | - Frank R. Fronczek
- Department of Chemistry
- 232 Choppin Hall
- Louisiana State University
- Baton Rouge
- USA
| | - Rendy Kartika
- Department of Chemistry
- 232 Choppin Hall
- Louisiana State University
- Baton Rouge
- USA
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8
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Miao CB, Zeng YM, Shi T, Liu R, Wei PF, Sun XQ, Yang HT. 2-Oxindole Acts as a Synthon of 2-Aminobenzoyl Anion in the K2CO3-Catalyzed Reaction with Enones: Preparation of 1,4-Diketones Bearing an Amino Group and Their Further Transformations. J Org Chem 2015; 81:43-50. [DOI: 10.1021/acs.joc.5b02054] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Chun-Bao Miao
- Jiangsu
Key Laboratory of
Advanced Catalytic Materials and Technology, Advanced Catalysis and
Green Manufacturing Collaborative Innovation Center, School of Petrochemical
Engineering, Changzhou University, Changzhou 213164, China
| | - Yu-Mei Zeng
- Jiangsu
Key Laboratory of
Advanced Catalytic Materials and Technology, Advanced Catalysis and
Green Manufacturing Collaborative Innovation Center, School of Petrochemical
Engineering, Changzhou University, Changzhou 213164, China
| | - Tong Shi
- Jiangsu
Key Laboratory of
Advanced Catalytic Materials and Technology, Advanced Catalysis and
Green Manufacturing Collaborative Innovation Center, School of Petrochemical
Engineering, Changzhou University, Changzhou 213164, China
| | - Rui Liu
- Jiangsu
Key Laboratory of
Advanced Catalytic Materials and Technology, Advanced Catalysis and
Green Manufacturing Collaborative Innovation Center, School of Petrochemical
Engineering, Changzhou University, Changzhou 213164, China
| | - Peng-Fei Wei
- Jiangsu
Key Laboratory of
Advanced Catalytic Materials and Technology, Advanced Catalysis and
Green Manufacturing Collaborative Innovation Center, School of Petrochemical
Engineering, Changzhou University, Changzhou 213164, China
| | - Xiao-Qiang Sun
- Jiangsu
Key Laboratory of
Advanced Catalytic Materials and Technology, Advanced Catalysis and
Green Manufacturing Collaborative Innovation Center, School of Petrochemical
Engineering, Changzhou University, Changzhou 213164, China
| | - Hai-Tao Yang
- Jiangsu
Key Laboratory of
Advanced Catalytic Materials and Technology, Advanced Catalysis and
Green Manufacturing Collaborative Innovation Center, School of Petrochemical
Engineering, Changzhou University, Changzhou 213164, China
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9
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Luo J, Jiang Q, Chen H, Tang Q. Catalyst-free formation of 1,4-diketones by addition of silyl enolates to oxyallyl zwitterions in situ generated from α-haloketones. RSC Adv 2015. [DOI: 10.1039/c5ra12244a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Here we report an efficient and practical method for the preparation of 1,4-diketones by direct coupling of α-haloketones with silyl enolates at room temperature. No catalysts were required in our protocol.
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Affiliation(s)
- Juan Luo
- Department of Medical Chemistry
- College of Pharmacy
- Chongqing Medical University
- Chongqing 400016
- P. R. China
| | - Qihua Jiang
- Department of Medical Chemistry
- College of Pharmacy
- Chongqing Medical University
- Chongqing 400016
- P. R. China
| | - Hao Chen
- Department of Medical Chemistry
- College of Pharmacy
- Chongqing Medical University
- Chongqing 400016
- P. R. China
| | - Qiang Tang
- Department of Medical Chemistry
- College of Pharmacy
- Chongqing Medical University
- Chongqing 400016
- P. R. China
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Nodin L, Noël O, Chaminade F, Maskri O, Barbier V, David O, Fossé P, Xie J. RNA SHAPE chemistry with aromatic acylating reagents. Bioorg Med Chem Lett 2014; 25:566-70. [PMID: 25557357 DOI: 10.1016/j.bmcl.2014.12.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Revised: 12/04/2014] [Accepted: 12/08/2014] [Indexed: 01/19/2023]
Abstract
As chemical methods for RNA secondary structure determination, SHAPE chemistry (selective 2'-hydroxyl acylation analyzed by primer extension) has been developed to specifically target flexible nucleotides (often unpaired nucleotides) independently to their purine or pyrimidine nature. In order to improve the specificity of acylating reagents towards unpaired nucleotides, we have explored the reactivity of symmetric anhydrides, acyl fluorides, active esters like succinimidyl ester and cyanomethyl esters for 2'-O-acylation reaction. Among the tested compounds, only the acyl fluoride 4 showed a low reactivity (compared to NMIA). However, this study is the first to show that nucleophilic catalysts like DMAP greatly improved the selective 2'-hydroxyl acylation by symmetric anhydrides, acyl fluorides and succinimidyl ester, with the 2-fluorobenzoic anhydride 5 being the most reactive.
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Affiliation(s)
- Laura Nodin
- PPSM, CNRS, Institut d'Alembert, ENS de Cachan, 61 Avenue du P(t) Wilson, F-94235 Cachan, France
| | - Olivier Noël
- PPSM, CNRS, Institut d'Alembert, ENS de Cachan, 61 Avenue du P(t) Wilson, F-94235 Cachan, France
| | - Françoise Chaminade
- LBPA, CNRS, Institut d'Alembert, ENS de Cachan, 61 Avenue du P(t) Wilson, F-94235 Cachan, France
| | - Ouerdia Maskri
- LBPA, CNRS, Institut d'Alembert, ENS de Cachan, 61 Avenue du P(t) Wilson, F-94235 Cachan, France
| | - Vincent Barbier
- Institut Lavoisier, CNRS, Université de Versailles St. Quentin-en-Yvelines, 45 avenue des Etats-Unis, 78035 Versailles, France
| | - Olivier David
- Institut Lavoisier, CNRS, Université de Versailles St. Quentin-en-Yvelines, 45 avenue des Etats-Unis, 78035 Versailles, France
| | - Philippe Fossé
- LBPA, CNRS, Institut d'Alembert, ENS de Cachan, 61 Avenue du P(t) Wilson, F-94235 Cachan, France.
| | - Juan Xie
- PPSM, CNRS, Institut d'Alembert, ENS de Cachan, 61 Avenue du P(t) Wilson, F-94235 Cachan, France.
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