1
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Baussière F, Haugland MM. Radical Group Transfer of Vinyl and Alkynyl Silanes Driven by Photoredox Catalysis. J Org Chem 2023; 88:12451-12463. [PMID: 37581630 PMCID: PMC10476183 DOI: 10.1021/acs.joc.3c01213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Indexed: 08/16/2023]
Abstract
Radical group transfer is a powerful tool for the formation of C-C bonds. These processes typically involve radical addition to C-C π bonds, followed by fragmentation of the resulting cyclic intermediate. Despite the advantageous lability of organosilanes in this context, silicon-tethered radical acceptor groups have remained underexplored in radical group transfer reactions. We report a general photoredox-catalyzed protocol for the radical group transfer of vinyl and alkynyl silanes onto sp3 carbons, using activated and unactivated iodides as radical precursors. Our method displays high diastereoselectivity and excellent functional group tolerance, and enables direct formation of group transfer products by in situ ring opening. Mechanistic investigations revealed that the reaction proceeds via an unusual dual catalytic cycle, resulting in an overall redox-neutral process.
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Affiliation(s)
- Floriane Baussière
- Department of Chemistry, UiT The Arctic University of Norway, 9037 Tromsø, Norway
| | - Marius M. Haugland
- Department of Chemistry, UiT The Arctic University of Norway, 9037 Tromsø, Norway
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2
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Yu P, Zhang W, Lin S. Enantioselective radical cascade cyclization via Ti-catalyzed redox relay. Tetrahedron Lett 2023; 125:154617. [PMID: 37449084 PMCID: PMC10338015 DOI: 10.1016/j.tetlet.2023.154617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Radical cascade cyclization reactions provide an efficient method for the construction of polycyclic architectures with multiple stereogenic centers. However, achieving enantioselectivity control of this type of reaction is a challenging task. Here, we report an enantioselective cyclization of polyfunctional aryl cyclopropyl ketone and alkyne units, wherein the stereochemical outcome is directed by a chiral Ti(salen) catalyst. This transformation was proposed to proceed via a radical cascade process involving the reductive ring-opening of the cyclopropyl ketone followed by two annulation events entailing cyclization of the ensuing alkyl radical onto the alkyne and subsequent addition of the incipient vinyl radical to the Ti(IV)-enolate.
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Affiliation(s)
- Peng Yu
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Wen Zhang
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Song Lin
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
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3
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Niu SS, Liu Y, Zhang Y, Li XC, Gong J, Ding W, Cheng Y. Experimental and Theoretical Study on the Regioselective Radical Cyclization Reactions of 1-( o-Alkenylaryl)-2-amido-1-ketones for the Construction of Indeno[2,1- d][1,3]oxazin-9-ones. J Org Chem 2022; 87:9576-9592. [PMID: 35820108 DOI: 10.1021/acs.joc.2c00567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A simple and efficient two-step method for the construction of novel 2,4,9a-trisubstituted-4a,9a-dihydroindeno[2,1-d][1,3]oxazin-9-ones has been developed. The NHC-catalyzed aza-benzoin reaction of o-alkenyl benzaldehydes with N-acylarylimines afforded 1-(o-alkenylaryl)-2-amido-2-aryl-1-ethanones, which underwent regioselective 5-exo-trig radical cyclization to furnish the three-ring-fused heterocyclic products, generally in good yields. The synthetic method displayed good tolerance toward the nature of substituents, substitution pattern, and steric hindrance of o-alkenyl benzaldehydes. Based on this method, the synthesis of unprecedented dihydrobenzo[6,7]indeno[2,1-d][1,3]oxazin-7-ones and dihydropyrido[2',3':3,4]cyclopenta[1,2-d][1,3]oxazin-9-ones has been achieved by employing o-alkenylnaphthaldehyde and o-alkenylnicotinaldehyde as substrates. The regioselectivity between 5-exo-trig and 6-endo-trig radical cyclization reactions of different 1-(o-alkenylaryl)-2-amido-2-aryl-1-ethanones were elucidated with DFT calculations.
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Affiliation(s)
- Shuang-Shuo Niu
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Yimin Liu
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Yue Zhang
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Xing-Chi Li
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Jian Gong
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Wanjian Ding
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Ying Cheng
- College of Chemistry, Beijing Normal University, Beijing 100875, China
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4
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Ye T, Zhang FL, Xia HM, Zhou X, Yu ZX, Wang YF. Stereoselective hydrogen atom transfer to acyclic radicals: a switch enabling diastereodivergent borylative radical cascades. Nat Commun 2022; 13:426. [PMID: 35058459 PMCID: PMC8776760 DOI: 10.1038/s41467-022-28071-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 01/04/2022] [Indexed: 12/18/2022] Open
Abstract
Radical cascade reactions are powerful tools to construct structurally complex molecules. However, the stereochemical control of acyclic radical intermediates remains a persistent challenge, due to the low differentiation between the two faces of these species. This hurdle further makes stereodivergent synthesis rather more difficult to be accomplished, in particular for intermediates resulted from complex cascades. Here we report an efficient strategy for stereoselective hydrogen atom transfer (HAT) to acyclic carbon radicals, which are generated via N-heterocyclic carbene (NHC)-boryl radicals triggered addition-translocation-cyclization cascades. A synergistic control by the NHC subunit and a thiol catalyst has proved effective for one facial HAT, while a ZnI2-chelation protocol allows for the preferential reaction to the opposite face. Such a stereoselectivity switch enables diastereodivergent construction of heterocycles tethering a boron-substituted stereocenter. Mechanistic studies suggest two complementary ways to tune HAT diastereoselectivity. The stereospecific conversions of the resulting boron-handled products to diverse functionalized molecules are demonstrated.
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Affiliation(s)
- Tian Ye
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, 230026, Hefei, Anhui, China
| | - Feng-Lian Zhang
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, 230026, Hefei, Anhui, China
| | - Hui-Min Xia
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, 230026, Hefei, Anhui, China
| | - Xi Zhou
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, 230026, Hefei, Anhui, China
| | - Zhi-Xiang Yu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, 100871, Beijing, China.
| | - Yi-Feng Wang
- Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, 230026, Hefei, Anhui, China.
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, 300071, Tianjin, China.
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5
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Zhang C, Wang DS, Lee WCC, McKillop AM, Zhang XP. Controlling Enantioselectivity and Diastereoselectivity in Radical Cascade Cyclization for Construction of Bicyclic Structures. J Am Chem Soc 2021; 143:11130-11140. [PMID: 34260202 PMCID: PMC8399859 DOI: 10.1021/jacs.1c04719] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Radical cascade cyclization reactions are highly attractive synthetic tools for the construction of polycyclic molecules in organic synthesis. While it has been successfully implemented in diastereoselective synthesis of natural products and other complex compounds, radical cascade cyclization faces a major challenge of controlling enantioselectivity. As the first application of metalloradical catalysis (MRC) for controlling enantioselectivity as well as diastereoselectivity in radical cascade cyclization, we herein report the development of a Co(II)-based catalytic system for asymmetric radical bicyclization of 1,6-enynes with diazo compounds. Through the fine-tuning of D2-symmetric chiral amidoporphyrins as the supporting ligands, the Co(II)-catalyzed radical cascade process, which proceeds in a single operation under mild conditions, enables asymmetric construction of multisubstituted cyclopropane-fused tetrahydrofurans bearing three contiguous stereogenic centers, including two all-carbon quaternary centers, in high yields with excellent stereoselectivities. Combined computational and experimental studies have shed light on the underlying stepwise radical mechanism for this new Co(II)-based cascade bicyclization that involves the relay of several Co-supported C-centered radical intermediates, including α-, β-, γ-, and ε-metalloalkyl radicals. The resulting enantioenriched cyclopropane-fused tetrahydrofurans that contain a trisubstituted vinyl group at the bridgehead, as showcased in several stereospecific transformations, may serve as useful intermediates for stereoselective organic synthesis. The successful demonstration of this new asymmetric radical process via Co(II)-MRC points out a potentially general approach for controlling enantioselectivity as well as diastereoselectivity in synthetically attractive radical cascade reactions.
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Affiliation(s)
- Congzhe Zhang
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Duo-Sheng Wang
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Wan-Chen Cindy Lee
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Alexander M McKillop
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - X Peter Zhang
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
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6
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Klychnikov MK, Pohl R, Císařová I, Jahn U. α,γ-Dioxygenated amides via tandem Brook rearrangement/radical oxygenation reactions and their application to syntheses of γ-lactams. Beilstein J Org Chem 2021; 17:688-704. [PMID: 33777244 PMCID: PMC7961876 DOI: 10.3762/bjoc.17.58] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 02/23/2021] [Indexed: 11/23/2022] Open
Abstract
Pyrrolidones are common heterocyclic fragments in various biologically active compounds. Here, a two-step radical-based approach to γ-lactams bearing three to four stereocenters starting from epoxides, N-allylic silylacetamides and TEMPO is reported. The sequence starts with a new tandem nucleophilic substitution/Brook rearrangement/single electron transfer-induced radical oxygenation furnishing orthogonally protected α,γ-dioxygenated N-allylamides with wide scope, mostly good yields, and partly good diastereo- and enantioselectivity for defined combinations of chiral epoxides and chiral amides. This represents a very rare example of an oxidative geminal C-C/C-O difunctionalization next to carbonyl groups. The resulting dioxygenated allylic amides are subsequently subjected to persistent radical effect-based 5-exo-trig radical cyclization reactions providing functionalized pyrrolidones in high yields as diastereomeric mixtures. They converge to 3,4-trans-γ-lactams by base-mediated equilibration, which can be easily further diversified. Stereochemical models for both reaction types were developed.
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Affiliation(s)
- Mikhail K Klychnikov
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 16610 Prague 6, Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 16610 Prague 6, Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, 12843 Prague 2, Czech Republic
| | - Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 16610 Prague 6, Czech Republic
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7
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Zhang ZQ, Xu YH, Dai JC, Li Y, Sheng J, Wang XS. Copper-Catalyzed Trifluoromethylation/Cyclization of Alkynes for Synthesis of Dioxodibenzothiazepines. Org Lett 2021; 23:2194-2198. [PMID: 33635668 DOI: 10.1021/acs.orglett.1c00344] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A facile and efficient approach for the synthesis of the CF3-containing dioxodibenzothiazepines has been developed via copper-catalyzed trifluoromethylation/cyclization of alkynes utilizing a radical relay strategy. This method has demonstrated low catalyst loading, high regiocontrol, and broad scope under mild conditions. Good compatibility for the N-protecting group, gram-scale experiment, and further derivation of product prove the versatility of this transformation.
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Affiliation(s)
- Zi-Qi Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Yi-Hao Xu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Jing-Cheng Dai
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Yan Li
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Jie Sheng
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Xi-Sheng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
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8
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Niu SS, Cheng Y. Construction of novel bridged aromatic ring-fused oxazocine frameworks via an N-heterocyclic carbene-catalyzed azabenzoin reaction and radical-initiated cascade cyclization. Org Chem Front 2021. [DOI: 10.1039/d1qo00483b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel method for the construction of 1,5-methanobenzo[f][1,3]oxazocin-6-ones and 6,10-methanopyrido[3,2-f][1,3]oxazocin-5-ones from o-vinyl aromatic aldehydes and N-acylarylimines was developed via NHC-catalyzed and radical-initiated reactions.
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Affiliation(s)
- Shuang-Shuo Niu
- College of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Ying Cheng
- College of Chemistry
- Beijing Normal University
- Beijing 100875
- China
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9
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Cao W, Deng H, Sun Y, Liu B, Qin S. Asymmetric Synthesis of Hispidanin A and Related Diterpenoids. Chemistry 2018; 24:9120-9129. [DOI: 10.1002/chem.201801156] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Wei Cao
- Key Laboratory of Green Chemistry & Technology, of the Ministry of Education Institution, College of Chemistry; Sichuan University; Chengdu Sichuan 610064 China
| | - Heping Deng
- Key Laboratory of Green Chemistry & Technology, of the Ministry of Education Institution, College of Chemistry; Sichuan University; Chengdu Sichuan 610064 China
| | - Ying Sun
- Key Laboratory of Green Chemistry & Technology, of the Ministry of Education Institution, College of Chemistry; Sichuan University; Chengdu Sichuan 610064 China
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology, of the Ministry of Education Institution, College of Chemistry; Sichuan University; Chengdu Sichuan 610064 China
| | - Song Qin
- Key Laboratory of Green Chemistry & Technology, of the Ministry of Education Institution, College of Chemistry; Sichuan University; Chengdu Sichuan 610064 China
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10
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Liu B, Yu JX, Li Y, Li JH, He DL. Copper-Catalyzed Annulation Cascades of Alkyne-Tethered α-Bromocarbonyls with Alkynes: An Access to Heteropolycycles. Org Lett 2018; 20:2129-2132. [DOI: 10.1021/acs.orglett.8b00236] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bang Liu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Jiang-Xi Yu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Yang Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Jin-Heng Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - De-Liang He
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
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11
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Chen B, Fang C, Liu P, Ready JM. Rhodium-Catalyzed Enantioselective Radical Addition of CX 4 Reagents to Olefins. Angew Chem Int Ed Engl 2017; 56:8780-8784. [PMID: 28544237 DOI: 10.1002/anie.201704074] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Indexed: 11/11/2022]
Abstract
We describe the synthetically useful enantioselective addition of Br-CX3 (X=Cl or Br) to terminal olefins to introduce a trihalomethyl group and generate optically active secondary bromides. Computational and experimental evidence supports an asymmetric atom-transfer radical addition (ATRA) mechanism in which the stereodetermining step involves outer-sphere bromine abstraction from a [(bisphosphine)RhII BrCl] complex by a benzylic radical intermediate. This mechanism appears unprecedented in asymmetric catalysis.
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Affiliation(s)
- Bo Chen
- Department of Biochemistry, UT Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX, 75390-9038, USA
| | - Cheng Fang
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA.,Computational Modeling and Simulation Program, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Joseph M Ready
- Department of Biochemistry, UT Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX, 75390-9038, USA
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12
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Chen B, Fang C, Liu P, Ready JM. Rhodium-Catalyzed Enantioselective Radical Addition of CX4
Reagents to Olefins. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201704074] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Bo Chen
- Department of Biochemistry; UT Southwestern Medical Center; 5323 Harry Hines Blvd Dallas TX 75390-9038 USA
| | - Cheng Fang
- Department of Chemistry; University of Pittsburgh; Pittsburgh PA 15260 USA
- Computational Modeling and Simulation Program; University of Pittsburgh; Pittsburgh PA 15260 USA
| | - Peng Liu
- Department of Chemistry; University of Pittsburgh; Pittsburgh PA 15260 USA
| | - Joseph M. Ready
- Department of Biochemistry; UT Southwestern Medical Center; 5323 Harry Hines Blvd Dallas TX 75390-9038 USA
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13
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Deng H, Cao W, Liu R, Zhang Y, Liu B. Asymmetric Total Synthesis of Hispidanin A. Angew Chem Int Ed Engl 2017; 56:5849-5852. [DOI: 10.1002/anie.201700958] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Indexed: 12/11/2022]
Affiliation(s)
- Heping Deng
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; 29 Wangjiang Rd., Chengdu Sichuan 610064 China
| | - Wei Cao
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; 29 Wangjiang Rd., Chengdu Sichuan 610064 China
| | - Rong Liu
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; 29 Wangjiang Rd., Chengdu Sichuan 610064 China
| | - Yanhui Zhang
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; 29 Wangjiang Rd., Chengdu Sichuan 610064 China
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; 29 Wangjiang Rd., Chengdu Sichuan 610064 China
- State Key Laboratory of Natural Medicines; China Pharmaceutical University; 24 Tong Jia Xiang Nanjing 210009 China
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14
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Deng H, Cao W, Liu R, Zhang Y, Liu B. Asymmetric Total Synthesis of Hispidanin A. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700958] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Heping Deng
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; 29 Wangjiang Rd., Chengdu Sichuan 610064 China
| | - Wei Cao
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; 29 Wangjiang Rd., Chengdu Sichuan 610064 China
| | - Rong Liu
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; 29 Wangjiang Rd., Chengdu Sichuan 610064 China
| | - Yanhui Zhang
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; 29 Wangjiang Rd., Chengdu Sichuan 610064 China
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; 29 Wangjiang Rd., Chengdu Sichuan 610064 China
- State Key Laboratory of Natural Medicines; China Pharmaceutical University; 24 Tong Jia Xiang Nanjing 210009 China
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15
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Miyabe H. Unique Strategies for Controlling Enantioselective Stereochemistry of Cyclizations via Radical Intermediates. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Hideto Miyabe
- School of Pharmacy; Hyogo University of Health Sciences; 650-8530 Minatojima, Chuo-ku Kobe Japan
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16
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Mao L, Li Y, Yang S. Silver-Catalyzed Cascade Radical Cyclization for Stereoselective Synthesis of Exocyclic Phosphine Oxides. CHINESE J CHEM 2017. [DOI: 10.1002/cjoc.201600707] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Liuliang Mao
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Lanzhou Gansu 730000 China
| | - Yonghong Li
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Lanzhou Gansu 730000 China
| | - Shangdong Yang
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Lanzhou Gansu 730000 China
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics; Chinese Academy of Sciences; Lanzhou Gansu 730000 China
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17
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Ma YN, Cheng MX, Yang SD. Diastereoselective Radical Oxidative C–H Aminations toward Chiral Atropoisomeric (P, N) Ligand Precursors. Org Lett 2017; 19:600-603. [DOI: 10.1021/acs.orglett.6b03625] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yan-Na Ma
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Ming-Xing Cheng
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Shang-Dong Yang
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
- State
Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou
Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
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18
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Miyabe H, Kawashima A, Yoshioka E, Kohtani S. Progress in Enantioselective Radical Cyclizations. Chemistry 2017; 23:6225-6236. [DOI: 10.1002/chem.201603124] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Indexed: 01/05/2023]
Affiliation(s)
- Hideto Miyabe
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
| | - Akira Kawashima
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
| | - Eito Yoshioka
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
| | - Shigeru Kohtani
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
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19
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Pati K, dos Passos Gomes G, Alabugin IV. Combining Traceless Directing Groups with Hybridization Control of Radical Reactivity: From Skipped Enynes to Defect‐Free Hexagonal Frameworks. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605799] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
| | | | - Igor V. Alabugin
- Department of Chemistry Florida State University Tallahassee FL USA
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20
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Pati K, dos Passos Gomes G, Alabugin IV. Combining Traceless Directing Groups with Hybridization Control of Radical Reactivity: From Skipped Enynes to Defect‐Free Hexagonal Frameworks. Angew Chem Int Ed Engl 2016; 55:11633-7. [DOI: 10.1002/anie.201605799] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Indexed: 01/08/2023]
Affiliation(s)
| | | | - Igor V. Alabugin
- Department of Chemistry Florida State University Tallahassee FL USA
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21
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Pan XQ, Zou JP, Yi WB, Zhang W. Recent advances in sulfur- and phosphorous-centered radical reactions for the formation of S–C and P–C bonds. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.04.117] [Citation(s) in RCA: 131] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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22
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Miyabe H, Yoshioka E, Kohtani S. Research and Development of Domino Radical Cyclization Reactions. J SYN ORG CHEM JPN 2015. [DOI: 10.5059/yukigoseikyokaishi.73.895] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hideto Miyabe
- School of Pharmacy, Hyogo University of Health Sciences
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23
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Martínez JI, Villar L, Uria U, Carrillo L, Reyes E, Vicario JL. Bifunctional Squaramide Catalysts with the Same Absolute Chirality for the Diastereodivergent Access to Densely Functionalised Cyclohexanes through Enantioselective Domino Reactions. Synthesis and Mechanistic Studies. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400502] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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24
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Gabriele B, Veltri L, Mancuso R, Carfagna C. Cascade Reactions: A Multicomponent Approach to Functionalized Indane Derivatives by a Tandem Palladium- Catalyzed Carbamoylation/Carbocylization Process. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201301051] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Muñoz-Bascón J, Hernández-Cervantes C, Padial NM, Álvarez-Corral M, Rosales A, Rodríguez-García I, Oltra JE. Ti-Catalyzed Straightforward Synthesis of Exocyclic Allenes. Chemistry 2013; 20:801-10. [DOI: 10.1002/chem.201304033] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Indexed: 11/10/2022]
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Pati K, Hughes AM, Phan H, Alabugin IV. Exo-DigRadical Cascades of Skipped Enediynes: Building a Naphthalene Moiety within a Polycyclic Framework. Chemistry 2013; 20:390-3. [DOI: 10.1002/chem.201304092] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Indexed: 01/23/2023]
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27
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Shirakawa S, Usui A, Kan SBJ, Maruoka K. Chiral Organotin Hydride Catalyzed Enantioselective Radical Cyclization of Aldehydes. ASIAN J ORG CHEM 2013. [DOI: 10.1002/ajoc.201300138] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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28
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Mondal S, Bertrand MP, Nechab M. Enantioselektive Synthese von carbocyclischen und heterocyclischen Verbindungen durch radikalische/polare und polare/radikalische Reaktionskaskaden. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201207518] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Mondal S, Bertrand MP, Nechab M. Enantioselective Synthesis of Carbocycles and Heterocycles by Radical/Polar and Polar/Radical Cascades. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/anie.201207518] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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30
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Clavier H, Pellissier H. Recent Developments in Enantioselective Metal-Catalyzed Domino Reactions. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200254] [Citation(s) in RCA: 154] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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31
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Wille U. Radical Cascades Initiated by Intermolecular Radical Addition to Alkynes and Related Triple Bond Systems. Chem Rev 2012; 113:813-53. [DOI: 10.1021/cr100359d] [Citation(s) in RCA: 465] [Impact Index Per Article: 38.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Uta Wille
- School of Chemistry and
BIO21 Molecular Science and
Biotechnology Institute, Australian Research Council Centre of Excellence
for Free Radical Chemistry and Biotechnology, The University of Melbourne, 30 Flemington Road, Parkville, Victoria
3010, Australia
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32
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Yoshioka E, Kohtani S, Sawai K, Kentefu, Tanaka E, Miyabe H. Polarity-mismatched addition of electrophilic carbon radicals to an electron-deficient acceptor: cascade radical addition-cyclization-trapping reaction. J Org Chem 2012; 77:8588-604. [PMID: 22963515 DOI: 10.1021/jo3015227] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The polarity-mismatched perfluoroalkyl radical addition to electron-deficient alkenes was studied. For this study, several substrates having two polarity-different radical acceptors were employed to investigate the regiochemical courses of cascade reaction. In the case of substrate 1 having a methacryloyl moiety, we found polarity-mismatched perfluoroalkylation giving 15a-e as a major course over the polarity-matched perfluoroalkylation giving 16a-e. Moreover, in the case of substrates 2-7, perfluoroalkyl radicals selectively added to an electron-deficient alkene moiety of 2-7, to give polarity-mismatched perfluoroalkylation products without the formation of regioisomers. Next, the control of enantioselectivity was studied. In the case of substrates 1 and 3, the reaction proceeded with good enantioselectivities by employing a chiral Lewis acid, prepared from chiral box ligand 24 and Zn(OTf)(2). For direct comparison, we also studied the reaction with other carbon radicals, derived from ICH(2)CO(2)Et, ICH(2)CN, BrC(CO(2)Et)(2)Me, and CCl(3)Br, which have electrophilic character.
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Affiliation(s)
- Eito Yoshioka
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
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Miyabe H, Asada R, Takemoto Y. Lewis acid-mediated radical cyclization: stereocontrol in cascade radical addition-cyclization-trapping reactions. Org Biomol Chem 2012; 10:3519-30. [PMID: 22434240 DOI: 10.1039/c2ob25073j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient approach for achieving radical cyclizations by using hydroxamate ester as a coordination tether with Lewis acid was studied. The chiral Lewis acid-mediated cascade radical addition-cyclization-trapping reaction proceeded smoothly with good enantio- and diastereoselectivities, providing various chiral γ-lactams.
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Affiliation(s)
- Hideto Miyabe
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.
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Bakowski A, Dressel M, Bauer A, Bach T. Enantioselective radical cyclisation reactions of 4-substituted quinolones mediated by a chiral template. Org Biomol Chem 2011; 9:3516-29. [DOI: 10.1039/c0ob01272f] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Jahn U. Radicals in transition metal catalyzed reactions? transition metal catalyzed radical reactions? a fruitful interplay anyway: part 1. Radical catalysis by group 4 to group 7 elements. Top Curr Chem (Cham) 2011; 320:121-89. [PMID: 22025066 DOI: 10.1007/128_2011_261] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This review summarizes the current status of radical-based transition metal catalyzed reactions in organic chemistry. The underlying features of radical generation from transition metal complexes and radical reactivity in the framework of transition metal catalysis are discussed. The available arsenal to detect radicals in transition metal catalyzed transformations is presented. Available strategies to combine radical intermediates with transition metal catalysis are outlined. In the main part the currently known synthetic methodology of transition metal catalyzed reactions proceeding via radical intermediates is discussed. This part covers catalytic radical reactions involving group 4 to group 7 elements.
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Affiliation(s)
- Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo namesti 2, 16610, Prague 6, Czech Republic.
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36
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Abstract
The first organocatalytic enantioselective radical polycyclization has been accomplished using singly occupied molecular orbital (SOMO) catalysis. The presented strategy relies on a selective single-electron oxidation of chiral enamines formed by condensation of polyenals with an imidazolidinone catalyst employing a suitable copper(II) oxidant. The reaction proceeds under mildly acidic conditions at room temperature and shows compatibility with an array of electron-poor as well as electron-rich functional groups. Upon termination by radical arylation followed by subsequent oxidation and rearomatization, a range of polycyclic aldehydes were accessed (12 examples, 54-77% yield, 85-93% ee). The enantioselective formation of up to six new carbocycles in a single catalyst-controlled cascade is described. Evidence for a radical-based cascade mechanism is indicated by a series of experimental results.
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Affiliation(s)
- Sebastian Rendler
- Merck Center for Catalysis at Princeton University, Princeton, New Jersey 08544
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37
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Overman LE, Tanis PS. Origin of stereocontrol in the construction of the 12-oxatricyclo[6.3.1.0(2,7)]dodecane ring system by Prins-pinacol reactions. J Org Chem 2010; 75:455-63. [PMID: 20000652 DOI: 10.1021/jo9024144] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Polycyclic products containing the 12-oxatricyclo[6.3.1.0(2,7)]dodecane moiety having either the trans (8a-e) or cis (9a-e) relative configuration of the oxacyclic bridge and the cis angular substituents are formed stereospecifically by Prins-pinacol cyclizations of unsaturated alpha-dithianyl acetals 14a-e or 15a-e. These results show that the topography (boat or chair) of the Prins cyclization of the sulfur-stabilized oxocarbenium ions generated from acetals 14a-e or 15a-e is controlled by the stereoelectronic influence of the allylic substituents, with steric effects playing a minor role. A complex molecular rearrangement that is terminated by a thio-Prins-pinacol reaction is also identified.
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Affiliation(s)
- Larry E Overman
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, California 92697-2025, USA.
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Reyes E, Talavera G, Vicario J, Badía D, Carrillo L. Enantioselective Organocatalytic Domino Oxa-Michael/Aldol/Hemiacetalization: Synthesis of Polysubstituted Furofuranes Containing Four Stereocenters. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200901333] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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41
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Reyes E, Talavera G, Vicario JL, Badía D, Carrillo L. Enantioselective Organocatalytic Domino Oxa-Michael/Aldol/Hemiacetalization: Synthesis of Polysubstituted Furofuranes Containing Four Stereocenters. Angew Chem Int Ed Engl 2009; 48:5701-4. [PMID: 19557777 DOI: 10.1002/anie.200901333] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Efraím Reyes
- Departamento de Química Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea, P.O. Box 644, 48080 Bilbao, Spain
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42
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Cao P, Sun XL, Zhu BH, Shen Q, Xie Z, Tang Y. Multistep One-Pot Wittig/Nazarov Reaction for Construction of Cyclopentenone with Diazo Compounds and Acid Chlorides. Org Lett 2009; 11:3048-51. [DOI: 10.1021/ol901086f] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Peng Cao
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China, School of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215123, China, and Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Xiu-Li Sun
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China, School of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215123, China, and Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Ben-Hu Zhu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China, School of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215123, China, and Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Qi Shen
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China, School of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215123, China, and Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Zuowei Xie
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China, School of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215123, China, and Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Yong Tang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China, School of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215123, China, and Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
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Estévez R, Justicia J, Bazdi B, Fuentes N, Paradas M, Choquesillo-Lazarte D, García-Ruiz J, Robles R, Gansäuer A, Cuerva J, Oltra J. Ti-Catalyzed Barbier-Type Allylations and Related Reactions. Chemistry 2009; 15:2774-91. [DOI: 10.1002/chem.200802180] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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44
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Miyabe H, Yoshioka E, Kohtani S. Enantioselective Radical Cyclization for the Synthesis of Cyclic Compounds. HETEROCYCLES 2009. [DOI: 10.3987/rev-08-sr(d)8] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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45
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Elamparuthi E, Kim BG, Yin J, Maurer M, Linker T. Cerium(IV)-mediated C–C bond formations in carbohydrate chemistry. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.08.109] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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46
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Ueda M, Miyabe H, Shimizu H, Sugino H, Miyata O, Naito T. Regioselective Hydroxysulfenylation of α,β-Unsaturated Imines: Enhanced Stability of an Intermediate Radical. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200801041] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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47
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Ueda M, Miyabe H, Shimizu H, Sugino H, Miyata O, Naito T. Regioselective Hydroxysulfenylation of α,β-Unsaturated Imines: Enhanced Stability of an Intermediate Radical. Angew Chem Int Ed Engl 2008; 47:5600-4. [DOI: 10.1002/anie.200801041] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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48
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Feray L, Bertrand MP. Dialkylzinc-Mediated Atom Transfer Sequential Radical Addition Cyclization. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800242] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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