1
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Majhi J, Dhungana RK, Rentería-Gómez Á, Sharique M, Li L, Dong W, Gutierrez O, Molander GA. Metal-Free Photochemical Imino-Alkylation of Alkenes with Bifunctional Oxime Esters. J Am Chem Soc 2022; 144:15871-15878. [PMID: 35984388 PMCID: PMC10245625 DOI: 10.1021/jacs.2c07170] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The concurrent installation of C-C and C-N bonds across alkene frameworks represents a powerful tool to prepare motifs that are ubiquitous in pharmaceuticals and bioactive compounds. To construct such prevalent bonds, most alkene difunctionalization methods demand the use of precious metals or activated alkenes. We report a metal-free, photochemically mediated imino-alkylation of electronically diverse alkenes to install both alkyl and iminyl groups in a highly efficient manner. The exceptionally mild reaction conditions, broad substrate scope, excellent functional group tolerance, and facile one-pot reaction protocol highlight the utility of this method to prepare privileged motifs from readily available alkene and acid feedstocks. One key and striking feature of this transformation is that an electrophilic trifluoromethyl radical is equally efficient with both electron-deficient and electron-rich alkenes. Additionally, dispersion-corrected density functional theory (DFT) and empirical investigations provide detailed mechanistic insight into this reaction.
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Affiliation(s)
- Jadab Majhi
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Roshan K. Dhungana
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Ángel Rentería-Gómez
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Mohammed Sharique
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Longbo Li
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Weizhe Dong
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Osvaldo Gutierrez
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Gary A. Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
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2
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Wei D, Liu T, He Y, Wei B, Pan J, Zhang J, Jiao N, Han B. Radical 1,4/5-Amino Shift Enables Access to Fluoroalkyl-Containing Primary β(γ)-Aminoketones under Metal-Free Conditions. Angew Chem Int Ed Engl 2021; 60:26308-26313. [PMID: 34437754 DOI: 10.1002/anie.202110583] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Indexed: 12/21/2022]
Abstract
A novel radical 1,4/5-amino shift from the oxygen center of alkene-tethered diphenyl ketoxime ethers to the carbon center to achieve high value-added fluoroalkyl-containing primary β(γ)-amino-ketones is reported. Mechanism studies reveal that the migration is triggered by the alkene addition of fluoroalkyl radical derived from the electron donor-acceptor (EDA) complex of Togni's reagent II or fluoroalkyl iodides and quinuclidine, and involves a unique 5(6)-exo-trig cyclization of the carbon-centered radical onto the N-atom of ketoxime ethers followed by a cascade sequence of N-O bond cleavage and dehydrogenation. Notably, besides Togni's reagent II and fluoroalkyl iodides, this protocol is also compatible with other radical precursors to provide various functionalized primary aminoketones.
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Affiliation(s)
- Dian Wei
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Tuming Liu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Yiheng He
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Bangyi Wei
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Jiahao Pan
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Jianwu Zhang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Ning Jiao
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, 100191, China
| | - Bing Han
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
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3
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Wei D, Liu T, He Y, Wei B, Pan J, Zhang J, Jiao N, Han B. Radical 1,4/5‐Amino Shift Enables Access to Fluoroalkyl‐Containing Primary β(γ)‐Aminoketones under Metal‐Free Conditions. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202110583] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Dian Wei
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Tuming Liu
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Yiheng He
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Bangyi Wei
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Jiahao Pan
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Jianwu Zhang
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Ning Jiao
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Beijing 100191 China
| | - Bing Han
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
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4
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Ye P, Shao Y, Zhang F, Zou J, Ye X, Chen J. Rare‐Earth‐Metal‐Catalyzed Synthesis of Azaindolines and Naphthyridines via C−H Cyclization of Functionalized Pyridines. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201901473] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Pengqing Ye
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
| | - Yinlin Shao
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
- Institute of New Materials & Industrial TechnologyWenzhou University Wenzhou 325035 People's Republic of China
| | - Fangjun Zhang
- School of Pharmaceutical SciencesWenzhou Medical University Wenzhou 325035 People's Republic of China
| | - Jinxuan Zou
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
| | - Xuanzeng Ye
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
| | - Jiuxi Chen
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
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5
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Building molecular complexity through transition-metal-catalyzed oxidative annulations/cyclizations: Harnessing the utility of phenols, naphthols and 1,3-dicarbonyl compounds. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2018.11.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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6
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Zhang W, Mo JY, He W, Kennepohl P, Sammis GM. Regiocontrolled and Stereoselective Syntheses of Tetrahydrophthalazine Derivatives using Radical Cyclizations. Chemistry 2019; 25:976-980. [PMID: 30350381 DOI: 10.1002/chem.201805249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Indexed: 11/06/2022]
Abstract
Tetrahydrophthalazine derivatives have found important applications in pharmaceutical research, but existing synthetic methods are unable to access them regio- and stereoselectively. Here, a new approach is presented that addresses these challenges by utilizing a 6-endo-trig radical cyclization in the key step. The desired tetrahydrophthalazines can be accessed in high yields (55-98 %) and high diastereoselectivities for the trans-product (>95:5) starting either from readily accessible hydrazones, or from the corresponding aldehydes and substituted Boc-hydrazides in a one-pot process. The synthetic versatility of the tetrahydrophthalazine core was demonstrated by its straightforward conversion to dihydro-phthalazines, phthalazines, or pyrazolo dione derivatives. Furthermore, the N-N bond was reduced to afford a new route to 1,4-diamines.
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Affiliation(s)
- Wei Zhang
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada
| | - Jia Yi Mo
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada
| | - Weiying He
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada
| | - Pierre Kennepohl
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada
| | - Glenn M Sammis
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada
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7
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Enantiospecific Total Syntheses of (+)-Hapalindole H and (−)-12-epi
-Hapalindole U. Chemistry 2018; 24:8980-8984. [DOI: 10.1002/chem.201800970] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Indexed: 12/15/2022]
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8
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Schempp TT, Daniels BE, Staben ST, Stivala CE. A General Strategy for the Construction of Functionalized Azaindolines via Domino Palladium-Catalyzed Heck Cyclization/Suzuki Coupling. Org Lett 2017; 19:3616-3619. [DOI: 10.1021/acs.orglett.7b01606] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tabitha T. Schempp
- Discovery Chemistry Group, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Blake E. Daniels
- Discovery Chemistry Group, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Steven T. Staben
- Discovery Chemistry Group, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Craig E. Stivala
- Discovery Chemistry Group, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
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9
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Gao S, Gao L, Meng H, Luo M, Zeng X. Iron-catalyzed synthesis of benzoxazoles by oxidative coupling/cyclization of phenol derivatives with benzoyl aldehyde oximes. Chem Commun (Camb) 2017; 53:9886-9889. [DOI: 10.1039/c7cc04965j] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
An iron-catalyzed oxidative coupling/cyclization reaction for the synthesis of benzoxazoles at room temperature is reported.
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Affiliation(s)
- Sen Gao
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Liming Gao
- Institute for the Control of Agrochemicals of Sichuan Province Chengdu
- Sichuan
- P. R. China
| | - Hong Meng
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Meiming Luo
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Xiaoming Zeng
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
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10
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Huan F, Chen QY, Guo Y. Visible Light-Induced Photoredox Construction of Trifluoromethylated Quaternary Carbon Centers from Trifluoromethylated Tertiary Bromides. J Org Chem 2016; 81:7051-63. [DOI: 10.1021/acs.joc.6b00930] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Feng Huan
- Key Laboratory of Organofluorine
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, P. R. of China
| | - Qing-Yun Chen
- Key Laboratory of Organofluorine
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, P. R. of China
| | - Yong Guo
- Key Laboratory of Organofluorine
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, P. R. of China
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11
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Liu Y, Cheng LJ, Yue HT, Che W, Xie JH, Zhou QL. Divergent enantioselective synthesis of hapalindole-type alkaloids using catalytic asymmetric hydrogenation of a ketone to construct the chiral core structure. Chem Sci 2016; 7:4725-4729. [PMID: 30155122 PMCID: PMC6016446 DOI: 10.1039/c6sc00686h] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 04/12/2016] [Indexed: 11/21/2022] Open
Abstract
A divergent enantioselective approach to hapalindole-type alkaloids is described. The route features a ruthenium-catalyzed asymmetric hydrogenation of a ketone via DKR to construct the chiral trans-1-indolyl-2-isopropenylcyclohexane skeleton and a switchable sequence of methylation and acetylation/aldol reaction to access a chiral quaternary stereocenter. (+)-Hapalindole Q (1, 13 steps, 5.9% overall yield), (-)-12-epi-hapalindole Q isonitrile (2, 15 steps, 5.5% overall yield), (-)-hapalindole D (3, 14 steps, 2.3% overall yield), and (+)-12-epi-fischerindole U isothiocyanate (4, 14 steps, 3.0% overall yield) were synthesized in 13-15 steps from a commercially available material to demonstrate the application of this approach.
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Affiliation(s)
- Yang Liu
- State Key Laboratory and Institute of Elemento-organic Chemistry , Nankai University , Tianjin 300071 , China .
| | - Li-Jie Cheng
- State Key Laboratory and Institute of Elemento-organic Chemistry , Nankai University , Tianjin 300071 , China .
| | - Hai-Tao Yue
- State Key Laboratory and Institute of Elemento-organic Chemistry , Nankai University , Tianjin 300071 , China .
| | - Wen Che
- State Key Laboratory and Institute of Elemento-organic Chemistry , Nankai University , Tianjin 300071 , China .
| | - Jian-Hua Xie
- State Key Laboratory and Institute of Elemento-organic Chemistry , Nankai University , Tianjin 300071 , China .
| | - Qi-Lin Zhou
- State Key Laboratory and Institute of Elemento-organic Chemistry , Nankai University , Tianjin 300071 , China .
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Nankai University , Tianjin 300071 , China
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12
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Jackl MK, Kreituss I, Bode JW. Synthesis of Tetrahydronaphthyridines from Aldehydes and HARP Reagents via Radical Pictet-Spengler Reactions. Org Lett 2016; 18:1713-5. [PMID: 27026179 DOI: 10.1021/acs.orglett.6b00523] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The combination of aldehydes with newly designed HARP (halogen amine radical protocol) reagents gives access to α-substituted tetrahydronaphthyridines. By using different HARP reagents, various regioisomeric structures can be prepared in a single operation. These products, which are of high value in medicinal chemistry, are formed in a predictable manner via a formal Pictet-Spengler reaction of electron-poor pyridines that would not participate in the corresponding polar reactions.
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Affiliation(s)
- Moritz K Jackl
- Laboratorium für Organische Chemie, Department of Chemistry and Applied Biosciences, ETH-Zürich , 8093 Zürich, Switzerland
| | - Imants Kreituss
- Laboratorium für Organische Chemie, Department of Chemistry and Applied Biosciences, ETH-Zürich , 8093 Zürich, Switzerland
| | - Jeffrey W Bode
- Laboratorium für Organische Chemie, Department of Chemistry and Applied Biosciences, ETH-Zürich , 8093 Zürich, Switzerland
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13
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Danneman MW, Hong KB, Johnston JN. A Unified Approach to the Four Azaindoline Families by Inter-/Intramolecular Annulative Diamination of Vinylpyridines. Org Lett 2015; 17:3806-9. [DOI: 10.1021/acs.orglett.5b01783] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Michael W. Danneman
- Department of Chemistry and
Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Ki Bum Hong
- Department of Chemistry and
Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Jeffrey N. Johnston
- Department of Chemistry and
Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
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14
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Liu D, Liu C, Lei A. Carbon-Centered Radical Addition to C=X Bonds for C−X Bond Formation. Chem Asian J 2015; 10:2040-54. [DOI: 10.1002/asia.201500326] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Dong Liu
- College of Chemistry and Molecular Sciences; the Institute for Advanced Studies (IAS); Wuhan University; Wuhan, Hubei 430072 P.R. China
| | - Chao Liu
- College of Chemistry and Molecular Sciences; the Institute for Advanced Studies (IAS); Wuhan University; Wuhan, Hubei 430072 P.R. China
| | - Aiwen Lei
- College of Chemistry and Molecular Sciences; the Institute for Advanced Studies (IAS); Wuhan University; Wuhan, Hubei 430072 P.R. China
- National Research Center for Carbohydrate Synthesis; Jiangxi Normal University; Nanchang, Jiangxi 330022 P.R. China
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15
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Lu Z, Yang M, Chen P, Xiong X, Li A. Total Synthesis of Hapalindole-Type Natural Products. Angew Chem Int Ed Engl 2014; 53:13840-4. [DOI: 10.1002/anie.201406626] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Indexed: 01/28/2023]
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16
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Lu Z, Yang M, Chen P, Xiong X, Li A. Total Synthesis of Hapalindole-Type Natural Products. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201406626] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Ghorai MK, Nanaji Y. Synthetic route to chiral indolines via ring-opening/C-N cyclization of activated 2-haloarylaziridines. J Org Chem 2013; 78:3867-78. [PMID: 23548056 DOI: 10.1021/jo400287a] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A practical approach for the synthesis of 3-substituted indolines via regio- and stereoselective SN2-type ring-opening of 2-(2-halophenyl)-N-tosylaziridines with heteroatomic nucleophiles (O, N, and S) followed by palladium-catalyzed intramolecular C-N cyclization is reported in excellent yields (up to >99%) and enantiomeric excess (ee 99%).
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Affiliation(s)
- Manas K Ghorai
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India.
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18
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Pigza JA, Han JS, Chandra A, Mutnick D, Pink M, Johnston JN. Total synthesis of the Lycopodium alkaloid serratezomine A using free radical-mediated vinyl amination to prepare a β-stannyl enamine linchpin. J Org Chem 2013; 78:822-43. [PMID: 23273261 PMCID: PMC3565160 DOI: 10.1021/jo302333s] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Serratezomine A is a member of the structurally diverse class of compounds known as the Lycopodium alkaloids. The key supporting studies and successful total synthesis of serratezomine A are described in this account. Significant features of the synthesis include the first application of free radical mediated vinyl amination and Hwu's oxidative allylation in a total synthesis and an intramolecular lactonization via a transannular S(N)i reaction. Minimal use of protecting groups and the highly diastereoselective formation of a hindered, quaternary stereocenter using an umpolung allylation are also highlights from a strategy perspective. Observation of quaternary carbon epimerization via a retro-Mannich/Mannich sequence highlights the additional challenge presented by the axial alcohol at C8 in serratezomine A.
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Affiliation(s)
| | | | | | | | | | - Jeffrey N. Johnston
- Department of Chemistry & Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235-1822
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19
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20
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Michaelis DJ, Dineen TA. Ring opening of aziridines with ortho-bromophenyl metal reagents: synthesis of 2-substituted indolines. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.02.047] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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Chandra A, Pigza JA, Han JS, Mutnick D, Johnston JN. Total synthesis of the lycopodium alkaloid (+)-serratezomine A. J Am Chem Soc 2009; 131:3470-1. [PMID: 19236097 PMCID: PMC2677822 DOI: 10.1021/ja900536d] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first total synthesis of (+)-serratezomine A is described. Key aspects of the synthesis include (a) the first deployment of free-radical-mediated vinyl amination (an intramolecular alkyne aminostannation) in a complex target synthesis, (b) the use of a beta-stannyl enamine as the lynchpin for convergent assembly of the natural product backbone, (c) the use of an oxidative allylation promoted by cerium(IV) (CAN) to establish the all-carbon quaternary chiral center with the proper configuration, and (d) an intramolecular substitution reaction to form the sensitive bridging lactone. Overall, 15 steps (longest linear sequence) are required to prepare the natural product from a commercially available aldehyde, and assembly of the contiguous array of six stereocenters is accomplished with high stereocontrol.
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Affiliation(s)
- Aroop Chandra
- Department of Chemistry & Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235-1822
| | - Julie A. Pigza
- Department of Chemistry & Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235-1822
| | - Jeong-Seok Han
- Department of Chemistry & Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235-1822
| | - Daniel Mutnick
- Department of Chemistry & Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235-1822
| | - Jeffrey N. Johnston
- Department of Chemistry & Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235-1822
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22
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Viswanathan R, Smith CR, Prabhakaran EN, Johnston JN. Free radical-mediated aryl amination: convergent two- and three-component couplings to chiral 2,3-disubstituted indolines. J Org Chem 2008; 73:3040-6. [PMID: 18351776 PMCID: PMC9129149 DOI: 10.1021/jo702523u] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
5-exo-trig Cyclization of an aryl radical to the nitrogen of an azomethine is used as the key annulating step in a modular preparation of 2,3-cis- and trans-disubstituted indolines. The precursors are readily prepared by phase-transfer-catalyzed Michael addition of a glycine Schiff base to a variety of acceptors. When the more reactive alkylidene malonate Michael acceptors are implemented, a one-pot three-component coupling is possible. The net result is a convergent [3 + 2] coupling strategy for the construction of highly functionalized indolines, a substructure occurring in numerous biologically active natural products.
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Affiliation(s)
- Rajesh Viswanathan
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235-1822, USA
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23
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Bailey WF, Salgaonkar PD, Brubaker JD, Sharma V. Preparation of the Isomeric Azaindoline Family by Intramolecular Carbolithiation. Org Lett 2008; 10:1071-4. [DOI: 10.1021/ol702862d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- William F. Bailey
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060
| | - Paresh D. Salgaonkar
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060
| | - Jason D. Brubaker
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060
| | - Vijayata Sharma
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060
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Chandra A, Viswanathan R, Johnston JN. Synthesis of the ABC- and D-ring systems of the indole alkaloid ambiguine G. Org Lett 2007; 9:5027-9. [PMID: 17975918 PMCID: PMC2617716 DOI: 10.1021/ol702247a] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A glycine Schiff base Michael addition is used in sequence with free radical-mediated aryl amination to ultimately arrive at the ambiguine G ABC-tricycle convergently. Additionally, thermal Diels-Alder cycloaddition of beta-chloromethacrolein with Cohen's diene is used to diastereoselectively construct the D-cyclohexane ring bearing a neopentyl chloride.
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Affiliation(s)
- Aroop Chandra
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235-1822, USA
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Pyridinium N-2′-pyridylaminide: radical cyclization in the synthesis of annulated 2-aminopyridines. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.09.092] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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El-Qacemi M, Ricard L, Zard SZ. An unprecedented radical ring closure on a pyridine nitrogen. Chem Commun (Camb) 2006:4422-4. [PMID: 17057864 DOI: 10.1039/b609021d] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An unprecedented radical ring-closure onto the pyridine nitrogen was observed when certain types of substituents were present around the pyridine nucleus.
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Affiliation(s)
- Myriem El-Qacemi
- Laboratoire de Synthèse Organique associé au CNRS, Département de Chimie, Ecole Polytechnique, F-91128 Palaiseau, France.
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Bacqué E, El Qacemi M, Zard SZ. Tin-Free Radical Cyclizations for the Synthesis of 7-Azaoxindoles, 7-Azaindolines, Tetrahydro[1,8]naphthyridines, and Tetrahydro-5H-pyrido[2,3-b]azepin-8-ones. Org Lett 2004; 6:3671-4. [PMID: 15469320 DOI: 10.1021/ol0489649] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Compounds containing a pyridine nucleus fused to a saturated nitrogen-containing ring, including 7-azaoxindoles, 7-azaindolines, tetrahydro[1,8]naphthyridines, and tetrahydro-5H-pyrido[2,3-b]azepin-8-ones, were prepared in good yield starting from various 2,6-dichloropyridines. The method hinges on a free-radical xanthate-mediated cyclization or intermolecular addition/cyclization sequence for the construction of the new fused rings.
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Affiliation(s)
- Eric Bacqué
- AVENTIS Pharma, 94 400 Vitry sur Seine, France
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