1
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Bayat M, Gheidari D, Mehrdad M. Recent advances in synthesis of ketenimines. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2022.104098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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2
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Smith PJ, Jiang Y, Tong Z, Pickford HD, Christensen KE, Nugent J, Anderson EA. Synthesis of Polysubstituted Fused Pyrroles by Gold-Catalyzed Cycloisomerization/1,2-Sulfonyl Migration of Yndiamides. Org Lett 2021; 23:6547-6552. [PMID: 34369785 DOI: 10.1021/acs.orglett.1c02360] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Yndiamides (bis-N-substituted alkynes) are valuable precursors to azacycles. Here we report a cycloisomerization/1,2-sulfonyl migration of alkynyl-yndiamides to form tetrahydropyrrolopyrroles, unprecedented heterocyclic scaffolds that are relevant to medicinal chemistry. This functional group tolerant transformation can be achieved using Au(I) catalysis that proceeds at ambient temperature, and a thermally promoted process. The utility of the products is demonstrated by a range of reactions to functionalize the fused pyrrole core.
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Affiliation(s)
- Philip J Smith
- Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Yubo Jiang
- Faculty of Science, Kunming University of Science and Technology, Kunming 650500, China
| | - Zixuan Tong
- Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Helena D Pickford
- Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | | | - Jeremy Nugent
- Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Edward A Anderson
- Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K
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3
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Wu T, Tang W. Construction of Bridged Polycyclic Skeletons via Transition-Metal Catalyzed Carbon-Carbon Bond-Forming Reactions. Chemistry 2021; 27:3944-3956. [PMID: 32918298 DOI: 10.1002/chem.202003863] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 09/10/2020] [Indexed: 12/15/2022]
Abstract
Transition-metal catalysis has become one of most important methods for constructing molecules with diverse architectures. Bridged polycyclic skeletons are often considered one of most challenging structures in organic synthesis. This Minireview summarizes the recent progress on synthesis of bridged polycyclic skeletons by transition-metal-catalyzed carbon-carbon bond-forming reaction. Four main ring-forming strategies including connection via olefin or carbonyl functionality, enolate intermediacy, C-H functionality, and aryl functionality are detailed and some effective methods are discussed with particular emphasis on reaction design and mechanism.
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Affiliation(s)
- Ting Wu
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, P. R. China
| | - Wenjun Tang
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, P. R. China.,School of Chemistry and Materials Science Hangzhou Institute for, Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou, 310024, P. R. China
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4
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Alexander JR, Shchepetkina VI, Stankevich KS, Benedict RJ, Bernhard SP, Dreiling RJ, Cook MJ. Pd-Catalyzed Rearrangement of N-Alloc- N-allyl Ynamides via Auto-Tandem Catalysis: Evidence for Reversible C-N Activation and Pd(0)-Accelerated Ketenimine Aza-Claisen Rearrangement. Org Lett 2021; 23:559-564. [PMID: 33410700 DOI: 10.1021/acs.orglett.0c04078] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An auto-tandem catalytic double allylic rearrangement of N-alloc-N-allyl ynamides was developed. This reaction proceeds through two separate and distinct catalytic cycles with both decarboxylative Pd-π-allyl and Pd(0)-promoted aza-Claisen rearrangements occurring. A detailed mechanistic study supported by computations highlights these two separate mechanisms. Previously unreported reversible C-N ionization and a Pd(0)-catalyzed [3,3]-sigmatropic rearrangement were discovered. This study provides new reaction pathways for both π-allyl and sigmatropic rearrangements.
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Affiliation(s)
- Juliana R Alexander
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Veronika I Shchepetkina
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Ksenia S Stankevich
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Rory J Benedict
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Samuel P Bernhard
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Reagan J Dreiling
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Matthew J Cook
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
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5
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Yang XH, Huang J, Wang F, Liu Z, Li Y, Tao CA, Wang J. Copper-catalyzed alkynylation/annulation cascades of N-allyl ynamides: regioselective access to medium-sized N-heterocycles. Org Chem Front 2021. [DOI: 10.1039/d0qo00837k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A synthetic strategy based on sequential application of aza-Claisen rearrangement, C–H functionalization, C–N coupling and cyclization as key steps has been developed for the synthesis of 6-, 7-, 8-, and 9-membered rings N-heterocycles.
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Affiliation(s)
- Xu-Heng Yang
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Jian Huang
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Fang Wang
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Zhuoliang Liu
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Yujiao Li
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Cheng-an Tao
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Jianfang Wang
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
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6
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Zhou G, Su J, Shang T, Wang X, Bai Y, Yuan Z, Zhu G. Synthesis of polysubstituted azetidines via cascade trifluoromethylation/cyclization of N-allyl ynamides. Org Chem Front 2021. [DOI: 10.1039/d1qo00559f] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A cascade trifluoromethylation/cyclization of N-allyl sulfonylynamides is developed, providing a direct access to azetidine-fused tricyclic compounds at room temperature.
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Affiliation(s)
- Genlai Zhou
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Department of Chemistry
- Zhejiang Normal University
- Jinhua 321004
- P. R. China
| | - Jingwen Su
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Department of Chemistry
- Zhejiang Normal University
- Jinhua 321004
- P. R. China
| | - Tianbo Shang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Department of Chemistry
- Zhejiang Normal University
- Jinhua 321004
- P. R. China
| | - Xiaojuan Wang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Department of Chemistry
- Zhejiang Normal University
- Jinhua 321004
- P. R. China
| | - Yihui Bai
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Department of Chemistry
- Zhejiang Normal University
- Jinhua 321004
- P. R. China
| | - Zheliang Yuan
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Department of Chemistry
- Zhejiang Normal University
- Jinhua 321004
- P. R. China
| | - Gangguo Zhu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Department of Chemistry
- Zhejiang Normal University
- Jinhua 321004
- P. R. China
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7
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Shen MH, Zhang YM, Jiang C, Xu HD, Xu D. Ag-Catalyzed cycloisomerization of 1,6-enynamide: an intramolecular type II Alder-ene reaction. Org Chem Front 2020. [DOI: 10.1039/c9qo01258c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An unusual type II Alder-ene cycloisomerization of 1,6-enynamide to fused bicyclic N-heterocycles is achieved by silver catalysis. 6-Endo-trig cyclization of a keteneiminium silver intermediate is proposed as the key step.
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Affiliation(s)
- Mei-Hua Shen
- School of Pharmaceutical Engineering and Life Science
- Changzhou University
- Changzhou 213164
- China
| | - Yu-Mei Zhang
- School of Pharmaceutical Engineering and Life Science
- Changzhou University
- Changzhou 213164
- China
| | - Chun Jiang
- School of Pharmaceutical Engineering and Life Science
- Changzhou University
- Changzhou 213164
- China
| | - Hua-Dong Xu
- School of Pharmaceutical Engineering and Life Science
- Changzhou University
- Changzhou 213164
- China
| | - Defeng Xu
- School of Pharmaceutical Engineering and Life Science
- Changzhou University
- Changzhou 213164
- China
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8
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UPLC-MS/MS determination of steroid hormones via a novel reaction based on derivatisation by a cyclic-organophosphate. Talanta 2019; 204:415-423. [PMID: 31357314 DOI: 10.1016/j.talanta.2019.06.046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 06/07/2019] [Accepted: 06/10/2019] [Indexed: 11/24/2022]
Abstract
A cyclic-organophosphate, specifically 2-chloro-5,5-dimethyl-1,3,2-dioxaphosphorinane-2-oxide, was used to derivatise the hydroxyl group at the C3 position of selected steroid hormones to analyse the derivatives using UPLC-MS/MS (ultra-performance liquid chromatography-tandem mass spectrometry). Reactions were performed in an anhydrous pyridine environment in the presence of AlCl3 at 50 °C. The developed reaction is suitable for analytical chemistry applications and was validated by analysis of selected contraceptive drugs. The sensitivity of the method depends on hormone tested and the limit of detection ranges from 130 pg/mL for β-estradiol to 240 pg/mL for estriol. The estimated efficiency of derivatisation reactions varies in the range from 77.5 to 95.7%, and depends upon the hormone undergoing derivatisation. The method's recovery rate for the lowest concentration tested (800 pg/mL) is 88.1-96.3%. The method exhibits linearity in the 390 pg/mL to 2.5 μg/mL range, with R2 = 0.997. The developed steroid hormone derivatisation reaction was validated experimentally using UHPLC-QTOF-MS (ultra-high performance liquid chromatography quadrupole time of flight mass spectrometry) and NMR (nuclear magnetic resonance) spectroscopy. These studies show that the developed derivatisation reaction provides a precise and repeatable determination of selected steroid hormones in contraceptive drugs. At n = 10, CV (Coefficient of Variation) did not exceed 7%, which is a very good result compared with other analytical methods.
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9
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Su R, Yang XH, Hu M, Wang QA, Li JH. Annulation Cascades of N-Allyl- N-((2-bromoaryl)ethynyl)amides Involving C-H Functionalization. Org Lett 2019; 21:2786-2789. [PMID: 30939026 DOI: 10.1021/acs.orglett.9b00740] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An annulation cascades of N-allyl- N-((2-bromoaryl)ethynyl)amides with terminal alkynes or 1,3-dicarbonyls involving C-H functionalization for producing 2,3-functionalized indoles has been first developed by means of Cu catalysis. The method is enabled by the formation of the ketenimine intermediates to deliver 2,3-disubstituted indoles through a sequence of aza-Claisen rearrangement, C-H functionalization, Ullmann C-N coupling, and cyclization.
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Affiliation(s)
- Rongkui Su
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle , Nanchang Hangkong University , Nanchang 330063 , China.,Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, School of Metallurgy and Environment , Central South University , Changsha 410083 , China
| | - Xu-Heng Yang
- College of Arts and Sciences , National University of Defense Technology , Changsha 410073 , China
| | - Ming Hu
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle , Nanchang Hangkong University , Nanchang 330063 , China
| | - Qiu-An Wang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle , Nanchang Hangkong University , Nanchang 330063 , China
| | - Jin-Heng Li
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle , Nanchang Hangkong University , Nanchang 330063 , China
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10
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Lin H, Chiang T, Wu R, Chang Y, Wang H, Liu S, Yeh MP. Synthesis of Halogenated Cyclic Enamines from Cyclic
N‐
2‐En‐4‐ynyl‐
N
‐1‐ynylamides and
N
‐Propargyl‐
N
‐1‐ynylamides via a Tandem Iron Halide Promoted N‐to‐C Shift‐Aza‐Prins Cyclization Sequence. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201801469] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Hsin‐Hui Lin
- Department of ChemistryNational Taiwan Normal University 88 Ding-Jou Road, Sec. 4 Taipei 11677 Taiwan, R.O.C
| | - Tai‐Ching Chiang
- Department of ChemistryNational Taiwan Normal University 88 Ding-Jou Road, Sec. 4 Taipei 11677 Taiwan, R.O.C
| | - Rong‐Xuan Wu
- Department of ChemistryNational Taiwan Normal University 88 Ding-Jou Road, Sec. 4 Taipei 11677 Taiwan, R.O.C
| | - Yi‐Mei Chang
- Department of ChemistryNational Taiwan Normal University 88 Ding-Jou Road, Sec. 4 Taipei 11677 Taiwan, R.O.C
| | - Hao‐Wen Wang
- Department of ChemistryNational Taiwan Normal University 88 Ding-Jou Road, Sec. 4 Taipei 11677 Taiwan, R.O.C
| | - Ssu‐Ting Liu
- Department of ChemistryNational Taiwan Normal University 88 Ding-Jou Road, Sec. 4 Taipei 11677 Taiwan, R.O.C
| | - Ming‐Chang P. Yeh
- Department of ChemistryNational Taiwan Normal University 88 Ding-Jou Road, Sec. 4 Taipei 11677 Taiwan, R.O.C
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11
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Prabagar B, Mallick RK, Prasad R, Gandon V, Sahoo AK. Umpolung Reactivity of Ynamides: An Unconventional [1,3]-Sulfonyl and [1,5]-Sulfinyl Migration Cascade. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201813143] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- B. Prabagar
- School of Chemistry; University of Hyderabad; Hyderabad India
| | | | - Rangu Prasad
- School of Chemistry; University of Hyderabad; Hyderabad India
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182; Université Paris-Sud; Université Paris-Saclay; Bâtiment 420 91405 Orsay cedex France
- Laboratoire de Chimie Moléculaire (LCM), CNRS UMR 9168; Ecole Polytechnique; Université Paris-Saclay; route de Saclay 91128 Palaiseau cedex France
| | - Akhila K. Sahoo
- School of Chemistry; University of Hyderabad; Hyderabad India
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12
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Prabagar B, Mallick RK, Prasad R, Gandon V, Sahoo AK. Umpolung Reactivity of Ynamides: An Unconventional [1,3]-Sulfonyl and [1,5]-Sulfinyl Migration Cascade. Angew Chem Int Ed Engl 2019; 58:2365-2370. [PMID: 30569486 DOI: 10.1002/anie.201813143] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Indexed: 01/25/2023]
Abstract
A regioselective sulfonyl/sulfinyl migration cycloisomerization cascade of alkyne-tethered ynamides is developed in the presence of XPhosgold catalyst. This reaction is the first example of a general [1,3]-sulfonyl migration from the nitrogen center to the β-carbon atom of ynamides, followed by umpolung 5-endo-dig cyclization of the ynamide α-carbon atom to the gold-activated alkyne, and final deaurative [1,5]-sulfinylation. This process allows the synthesis of peripherally decorated unconventional 4-sulfinylated pyrroles with broad scope from N-propargyl-tethered ynamides. In contrast, N-homopropargyl-tethered ynamides undergo intramolecular tetradehydro Diels-Alder reaction to provide 2,3-dihydro-benzo[f]indole derivatives. Control experiments and density-functional theory studies were used to study the reaction pathways.
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Affiliation(s)
- B Prabagar
- School of Chemistry, University of Hyderabad, Hyderabad, India
| | | | - Rangu Prasad
- School of Chemistry, University of Hyderabad, Hyderabad, India
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182, Université Paris-Sud, Université Paris-Saclay, Bâtiment 420, 91405, Orsay cedex, France.,Laboratoire de Chimie Moléculaire (LCM), CNRS UMR 9168, Ecole Polytechnique, Université Paris-Saclay, route de Saclay, 91128, Palaiseau cedex, France
| | - Akhila K Sahoo
- School of Chemistry, University of Hyderabad, Hyderabad, India
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13
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Dodd RH, Cariou K. Ketenimines Generated from Ynamides: Versatile Building Blocks for Nitrogen-Containing Scaffolds. Chemistry 2017; 24:2297-2304. [DOI: 10.1002/chem.201704689] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Indexed: 12/26/2022]
Affiliation(s)
- Robert H. Dodd
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301; Université Paris-Sud, Université Paris-Saclay; Avenue de la Terrasse 91198 Gif-sur-Yvette France
| | - Kevin Cariou
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301; Université Paris-Sud, Université Paris-Saclay; Avenue de la Terrasse 91198 Gif-sur-Yvette France
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14
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Alexander JR, Cook MJ. Formation of Ketenimines via the Palladium-Catalyzed Decarboxylative π-Allylic Rearrangement of N-Alloc Ynamides. Org Lett 2017; 19:5822-5825. [DOI: 10.1021/acs.orglett.7b02780] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Juliana R. Alexander
- School
of Chemistry and Chemical Engineering, Queen’s University Belfast, Belfast BT9 5AG, Northern Ireland
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Matthew J. Cook
- School
of Chemistry and Chemical Engineering, Queen’s University Belfast, Belfast BT9 5AG, Northern Ireland
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
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15
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Mansfield SJ, Christensen KE, Thompson AL, Ma K, Jones MW, Mekareeya A, Anderson EA. Copper-Catalyzed Synthesis and Applications of Yndiamides. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201706915] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | | | | | - Kai Ma
- Chemistry Research Laboratory; 12 Mansfield Road Oxford OX1 3TA UK
| | - Michael W. Jones
- Chemistry Research Laboratory; 12 Mansfield Road Oxford OX1 3TA UK
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16
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Mansfield SJ, Christensen KE, Thompson AL, Ma K, Jones MW, Mekareeya A, Anderson EA. Copper-Catalyzed Synthesis and Applications of Yndiamides. Angew Chem Int Ed Engl 2017; 56:14428-14432. [DOI: 10.1002/anie.201706915] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 08/11/2017] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | - Kai Ma
- Chemistry Research Laboratory; 12 Mansfield Road Oxford OX1 3TA UK
| | - Michael W. Jones
- Chemistry Research Laboratory; 12 Mansfield Road Oxford OX1 3TA UK
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17
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Chen P, Song CX, Wang WS, Yu XL, Tang Y. TfOH-mediated [2 + 2 + 2] cycloadditions of ynamides with two discrete nitriles: synthesis of 4-aminopyrimidine derivatives. RSC Adv 2016. [DOI: 10.1039/c6ra11408c] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this study, a concise and atom-economical TfOH-mediated [2 + 2 + 2] cycloaddition of ynamides with two discrete nitriles is developed to synthesize multi-substituted 4-aminopyrimidine.
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Affiliation(s)
- Ping Chen
- School of Pharmaceutical Science and Technology
- Key Laboratory for Modern Drug Delivery & High-Efficiency
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Cai-xia Song
- School of Pharmaceutical Science and Technology
- Key Laboratory for Modern Drug Delivery & High-Efficiency
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Wan-shu Wang
- School of Pharmaceutical Science and Technology
- Key Laboratory for Modern Drug Delivery & High-Efficiency
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Xue-liang Yu
- School of Pharmaceutical Science and Technology
- Key Laboratory for Modern Drug Delivery & High-Efficiency
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Yu Tang
- School of Pharmaceutical Science and Technology
- Key Laboratory for Modern Drug Delivery & High-Efficiency
- Tianjin University
- Tianjin 300072
- P. R. China
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18
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Yeh MCP, Liang CJ, Chen HF, Weng YT. Indium(III)-Catalyzed Cyclization of Aromatic 5-Enynamides: Facile Synthesis of 2-Aminonaphthalenes, 2-Amino-1H-indenes, and 2,3-Dihydro-1H-indeno[2,1-b]pyridines. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500449] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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19
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S3S63 Terminal Ynamides: Synthesis, Coupling Reactions and Additions to Common Electrophiles. Tetrahedron Lett 2015; 56:2377-2392. [PMID: 26085692 DOI: 10.1016/j.tetlet.2015.03.111] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Ynamides consist of a polarized triple bond that is directly attached to a nitrogen atom carrying a sulfonyl, an alkoxycarbonyl, an acyl or another electron withdrawing group. The triple bond polarization renders ynamides broadly useful building blocks with synthetic opportunities that go far beyond traditional alkyne chemistry. The versatile reactivity of ynamides in cycloadditions, cycloisomerizations, regioselective additions with various nucleophiles or electrophiles, ring-closing metathesis, and many other reactions has been investigated in detail during the past decades. A common feature of these methods is that the triple bond is consumed and either cleaved or transformed to a new functionality. The wealth of reports on these ynamide reactions is in stark contrast to the dearth of carbon-carbon bond formations that leave the triple bond of terminal ynamides intact. The recent introduction of effective synthetic methods for the preparation of terminal ynamides has set the stage to fully explore the synthetic potential of this intriguing class of compounds. This digest letter summarizes the most effective routes to terminal ynamides and the current state of selective nucleophilic addition, substitution and coupling reactions, including the first examples of asymmetric synthesis.
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20
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Tang Z, Mandal S, Paul ND, Lutz M, Li P, van der Vlugt JI, de Bruin B. Rhodium catalysed conversion of carbenes into ketenes and ketene imines using PNN pincer complexes. Org Chem Front 2015. [DOI: 10.1039/c5qo00287g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
PNN pincer-type rhodium complexes catalyze ketene and ketene imine synthesis, using CO or an isocyanide and a carbene precursor.
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Affiliation(s)
- Z. Tang
- Supramolecular
- Homogeneous & Bio-inspired Catalysis
- van't Hoff Institute for Molecular Sciences
- University of Amsterdam
- The Netherlands
| | - S. Mandal
- Supramolecular
- Homogeneous & Bio-inspired Catalysis
- van't Hoff Institute for Molecular Sciences
- University of Amsterdam
- The Netherlands
| | - N. D. Paul
- Supramolecular
- Homogeneous & Bio-inspired Catalysis
- van't Hoff Institute for Molecular Sciences
- University of Amsterdam
- The Netherlands
| | - M. Lutz
- Crystal and Structural Chemistry
- Bijvoet Center for Biomolecular Research
- Utrecht University
- Utrecht
- The Netherlands
| | - P. Li
- Supramolecular
- Homogeneous & Bio-inspired Catalysis
- van't Hoff Institute for Molecular Sciences
- University of Amsterdam
- The Netherlands
| | - J. I. van der Vlugt
- Supramolecular
- Homogeneous & Bio-inspired Catalysis
- van't Hoff Institute for Molecular Sciences
- University of Amsterdam
- The Netherlands
| | - B. de Bruin
- Supramolecular
- Homogeneous & Bio-inspired Catalysis
- van't Hoff Institute for Molecular Sciences
- University of Amsterdam
- The Netherlands
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21
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Jansone-Popova S, Le PQ, May JA. Carbene cascades for the formation of bridged polycyclic rings. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.03.060] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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22
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Theunissen C, Métayer B, Henry N, Compain G, Marrot J, Martin-Mingot A, Thibaudeau S, Evano G. Keteniminium Ion-Initiated Cascade Cationic Polycyclization. J Am Chem Soc 2014; 136:12528-31. [DOI: 10.1021/ja504818p] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Cédric Theunissen
- Laboratoire
de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université Libre de Bruxelles (ULB), Avenue F. D. Roosevelt 50, CP160/06, 1050 Brussels, Belgium
| | - Benoît Métayer
- Superacid
Group in “Organic Synthesis” Team, Université de Poitiers, CNRS UMR 7285 IC2MP, Bât. B28, 4 rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex 09, France
| | - Nicolas Henry
- Laboratoire
de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université Libre de Bruxelles (ULB), Avenue F. D. Roosevelt 50, CP160/06, 1050 Brussels, Belgium
| | - Guillaume Compain
- Superacid
Group in “Organic Synthesis” Team, Université de Poitiers, CNRS UMR 7285 IC2MP, Bât. B28, 4 rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex 09, France
| | - Jérome Marrot
- Institut
Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles Saint-Quentin en Yvelines, 45 avenue des Etats-Unis, 78035 Versailles Cedex, France
| | - Agnès Martin-Mingot
- Superacid
Group in “Organic Synthesis” Team, Université de Poitiers, CNRS UMR 7285 IC2MP, Bât. B28, 4 rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex 09, France
| | - Sébastien Thibaudeau
- Superacid
Group in “Organic Synthesis” Team, Université de Poitiers, CNRS UMR 7285 IC2MP, Bât. B28, 4 rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex 09, France
| | - Gwilherm Evano
- Laboratoire
de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université Libre de Bruxelles (ULB), Avenue F. D. Roosevelt 50, CP160/06, 1050 Brussels, Belgium
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23
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Brandi A, Cicchi S, Cordero FM, Goti A. Progress in the synthesis and transformations of alkylidenecyclopropanes and alkylidenecyclobutanes. Chem Rev 2014; 114:7317-420. [PMID: 24927495 DOI: 10.1021/cr400686j] [Citation(s) in RCA: 209] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Alberto Brandi
- Dipartimento di Chimica "Ugo Schiff", Università degli Studi di Firenze , Via della Lastruccia 13, I-50019-Sesto Fiorentino, Italy
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24
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Laouiti A, Couty F, Marrot J, Boubaker T, Rammah MM, Rammah MB, Evano G. Exploring the Anionic Reactivity of Ynimines, Useful Precursors of Metalated Ketenimines. Org Lett 2014; 16:2252-5. [DOI: 10.1021/ol500749h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Anouar Laouiti
- Institut
Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles Saint-Quentin-en-Yvelines, 45, Avenue des Etats-Unis, 78035 Versailles Cedex, France
- Laboratoire
de Chimie Hétérocyclique, Produits Naturels et Réactivité,
Département de Chimie, Faculté des Sciences de Monastir, Université de Monastir, Avenue de l’Environnement, 5019 Monastir, Tunisia
| | - François Couty
- Institut
Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles Saint-Quentin-en-Yvelines, 45, Avenue des Etats-Unis, 78035 Versailles Cedex, France
| | - Jérome Marrot
- Institut
Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles Saint-Quentin-en-Yvelines, 45, Avenue des Etats-Unis, 78035 Versailles Cedex, France
| | - Taoufik Boubaker
- Laboratoire
de Chimie Hétérocyclique, Produits Naturels et Réactivité,
Département de Chimie, Faculté des Sciences de Monastir, Université de Monastir, Avenue de l’Environnement, 5019 Monastir, Tunisia
| | - Mohamed M. Rammah
- Laboratoire
de Chimie Hétérocyclique, Produits Naturels et Réactivité,
Département de Chimie, Faculté des Sciences de Monastir, Université de Monastir, Avenue de l’Environnement, 5019 Monastir, Tunisia
| | - Mohamed B. Rammah
- Laboratoire
de Chimie Hétérocyclique, Produits Naturels et Réactivité,
Département de Chimie, Faculté des Sciences de Monastir, Université de Monastir, Avenue de l’Environnement, 5019 Monastir, Tunisia
| | - Gwilherm Evano
- Laboratoire
de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université libre de Bruxelles (ULB), Avenue F. D. Roosevelt 50, CP160/06, 1050 Brussels, Belgium
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25
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Wang XN, Yeom HS, Fang LC, He S, Ma ZX, Kedrowski BL, Hsung RP. Ynamides in ring forming transformations. Acc Chem Res 2014; 47:560-78. [PMID: 24164363 DOI: 10.1021/ar400193g] [Citation(s) in RCA: 462] [Impact Index Per Article: 46.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The ynamide functional group activates carbon-carbontriple bonds through an attached nitrogen atom that bears an electron-withdrawing group. As a result, the alkyne has both electrophilic and nucleophilic properties. Through the selection of the electron-withdrawing group attached to nitrogen, chemists can modulate the electronic properties and reactivity of ynamides, making these groups versatile synthetic building blocks. The reactions of ynamides also lead directly to nitrogen-containing products, which provides access to important structural motifs found in natural products and molecules of medicinal interest. Therefore, researchers have invested increasing time and research in the chemistry of ynamides in recent years. This Account surveys and assesses new organic transforma-tions involving ynamides developed in our laboratory and in others around the world. We showcase the synthetic power of ynamides for rapid assembly of complex molecular structures. Among the recent reports of ynamide transformations, ring-forming reactions provide a powerful tool for generating molecular complexity quickly. In addition to their synthetic utility, such reactions are mechanistically interesting. Therefore, we focus primarily on the cyclization chemistry of ynamides. This Account highlights ynamide reactions that are useful in the rapid synthesis of cyclic and polycyclic structural manifolds. We discuss the mechanisms active in the ring formations and describe representative examples that demonstrate the scope of these reactions and provide mechanistic insights. In this discussion, we feature examples of ynamide reactions involving radical cyclizations, ring-closing metathesis, transition metal and non-transition metal mediated cyclizations, cycloaddition reactions, and rearrangements. The transformations presented rapidly introduce structural complexity and include nitrogen within or in close proximity to a newly formed ring (or rings). Thus, ynamides have emerged as powerful synthons for nitrogen-containing heterocycles and nitrogen-substituted rings, and we hope this Account will promote continued interest in the chemistry of ynamides.
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Affiliation(s)
- Xiao-Na Wang
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Hyun-Suk Yeom
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Li-Chao Fang
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Shuzhong He
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Zhi-Xiong Ma
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Brant L. Kedrowski
- Department of Chemistry, University of Wisconsin, Oshkosh, Wisconsin 54901, United States
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States
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26
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Walker PR, Campbell CD, Suleman A, Carr G, Anderson EA. Palladium‐ and Ruthenium‐Catalyzed Cycloisomerization of Enynamides and Enynhydrazides: A Rapid Approach to Diverse Azacyclic Frameworks. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304186] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- P. Ross Walker
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA (UK) http://anderson.chem.ox.ac.uk/
| | - Craig D. Campbell
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA (UK) http://anderson.chem.ox.ac.uk/
| | - Abid Suleman
- AstraZeneca, Alderley Park, Macclesfield, SK10 4TF (UK)
| | - Greg Carr
- AstraZeneca, Alderley Park, Macclesfield, SK10 4TF (UK)
| | - Edward A. Anderson
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA (UK) http://anderson.chem.ox.ac.uk/
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27
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Walker PR, Campbell CD, Suleman A, Carr G, Anderson EA. Palladium- and Ruthenium-Catalyzed Cycloisomerization of Enynamides and Enynhydrazides: A Rapid Approach to Diverse Azacyclic Frameworks. Angew Chem Int Ed Engl 2013; 52:9139-43. [DOI: 10.1002/anie.201304186] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Indexed: 11/05/2022]
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28
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Qi R, Wang XN, Dekorver KA, Tang Y, Wang CC, Li Q, Li H, Lv MC, Yu Q, Hsung RP. A Convenient Synthesis of γ-Amino-Ynamides via Additions of Lithiated Ynamides to Aryl Imines. Observation of an Aza-Meyer-Schuster Rearrangement. SYNTHESIS-STUTTGART 2013; 45:1749-1758. [PMID: 23976795 PMCID: PMC3748967 DOI: 10.1055/s-0033-1338476] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Efforts in developing an expeditious and convenient method for synthesizing γ-amino-ynamides via nucleophilic addition of lithiated ynamides to aryl imines are described. This work also features an aza-variant of a Meyer-Schuster rearrangement of γ-amino-ynamides and the synthetic utility of γ-amino-ynamides in an intramolecular ketenimine-[2 + 2] cycloaddition.
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Affiliation(s)
- Rui Qi
- School of Pharmaceutical Science and Technology, and Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, Tianjin University, Tianjin 300072 P. R. China
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29
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Affiliation(s)
- Annette D. Allen
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Thomas T. Tidwell
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
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30
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Wang XN, Winston-McPherson GN, Walton MC, Zhang Y, Hsung RP, DeKorver KA. Synthesis of cyclopentenimines from N-allyl ynamides via a tandem aza-Claisen rearrangement-carbocyclization sequence. J Org Chem 2013; 78:6233-44. [PMID: 23718841 DOI: 10.1021/jo400960e] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We describe here details of our investigations into Pd-catalyzed and thermal aza-Claisen-carbocyclizations of N-allyl ynamides to prepare a variety of α,β-unsaturated cyclopentenimines. The nature of the ynamide electron-withdrawing group and β-substituent plays critical roles in the success of this tandem cascade. With N-sulfonyl ynamides, the use of palladium catalysis is required, as facile 1,3-sulfonyl shifts dominate under thermal conditions. However, since no analogous 1,3-phosphoryl shift is operational, N-phosphoryl ynamides could be used to prepare similar cyclopentenimines under thermal conditions through zwitter ionic intermediates that undergo N-promoted H-shifts. Alternatively, by employing ynamides bearing tethered carbon nucleophiles, the zwitter ionic intermediates could be intercepted, giving rise rapidly to more complex fused bi- and tricyclic scaffolds.
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Affiliation(s)
- Xiao-Na Wang
- Division of Pharmaceutical Sciences and Department of Chemistry, 777 Highland Avenue, University of Wisconsin, Madison, Wisconsin 53705-2222, United States
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31
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Saito N, Saito K, Sato H, Sato Y. Regio- and Stereoselective Synthesis of Tri- and Tetrasubstituted EnamidesviaPalladium-Catalyzed Silaboration of Ynamides. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201201111] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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32
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Greenaway RL, Campbell CD, Chapman HA, Anderson EA. Reductive Cyclization of Bromoenynamides with Alcohols as Hydride Source: Synthesis and Reactions of 2-Amidodienes. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200703] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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33
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Li S, Li Z, Wu J. Synthesis of Benzoindolinesviaa Copper-Catalyzed Reaction of 1-Bromoethynyl-2-(cyclopropylidenemethyl)arenes withN-Allylsulfonamide. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200374] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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34
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Yang Y, Zhang X, Liang Y. Copper-catalyzed coupling of 1,2-dibromo-1-styrenes with sulfonamides for the preparation of ynamides. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.09.092] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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35
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Jansone-Popova S, May JA. Synthesis of bridged polycyclic ring systems via carbene cascades terminating in C-H bond insertion. J Am Chem Soc 2012; 134:17877-80. [PMID: 23083300 DOI: 10.1021/ja308305z] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A carbene cascade reaction that constructs functionalized bridged bicyclic systems from alkynyl diazoesters is presented. The cascade proceeds through diazo decomposition, carbene/alkyne metathesis, and C-H bond insertion. The diazoesters are easily synthesized from cyclic ketones. Substrate ring size and substitution patterns control the connectivity and diastereomeric preference found in the products.
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Affiliation(s)
- Santa Jansone-Popova
- Department of Chemistry, University of Houston, 136 Fleming Building, Houston, Texas 77204-5003, USA
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36
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Verrier C, Carret S, Poisson JF. Asymmetric Addition of Alkoxy Ethynyl Anion to Chiral N-Sulfinyl Imines. Org Lett 2012; 14:5122-5. [DOI: 10.1021/ol302392k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Charlie Verrier
- Département de Chimie Moléculaire (SERCO), UMR-5250, ICMG FR-2607, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
| | - Sébastien Carret
- Département de Chimie Moléculaire (SERCO), UMR-5250, ICMG FR-2607, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
| | - Jean-Francois Poisson
- Département de Chimie Moléculaire (SERCO), UMR-5250, ICMG FR-2607, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
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37
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Smith DL, Chidipudi SR, Goundry WR, Lam HW. Rhodium-catalyzed [2 + 2] cycloaddition of ynamides with nitroalkenes. Org Lett 2012; 14:4934-7. [PMID: 22954424 DOI: 10.1021/ol302259v] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In the presence of a diene-ligated rhodium complex, ynamides and nitroalkenes undergo catalytic [2 + 2] cycloadditions to provide cyclobutenamides. The presence of sodium tetraphenylborate was found to be crucial for the reactions to proceed efficiently.
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Affiliation(s)
- Donna L Smith
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, The King's Buildings, West Mains Road, Edinburgh, EH9 3JJ, United Kingdom
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Heffernan SJ, Carbery DR. Ireland–Claisen rearrangement of ynamides: stereocontrolled synthesis of 2-amidodienes. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.07.088] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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39
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DeKorver KA, Hsung RP, Song WZ, Wang XN, Walton MC. An intramolecular [2 + 2] cycloaddition of ketenimines via palladium-catalyzed rearrangements of N-allyl-ynamides. Org Lett 2012; 14:3214-7. [PMID: 22667819 DOI: 10.1021/ol3013233] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A cascade of Pd-catalyzed N-to-C allyl transfer-intramolecular ketenimine-[2 + 2] cycloadditions of N-allyl ynamides is described. This tandem sequence is highly stereoselective and the [2 + 2] cycloaddition could be rendered in a crossed or fused manner depending on alkene substitutions, leading to bridged and fused bicycloimines.
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Affiliation(s)
- Kyle A DeKorver
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, USA
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40
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Cao J, Kong Y, Deng Y, Lai G, Cui Y, Hu Z, Wang G. Synthesis of allenamides by Pd-catalyzed coupling of 3-alkoxycarbonyloxy ynamides or 1-alkoxycarbonyloxy allenamides with arylboronic acids. Org Biomol Chem 2012; 10:9556-61. [DOI: 10.1039/c2ob26727f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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