1
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Ke Y, Gall BK, Dewey NS, Rotavera B, Ferreira EM. Multigram Synthesis of a Combustion-Relevant δ-Ketohydroperoxide through Sulfonylhydrazine Substitution. Chemistry 2022; 28:e202202266. [PMID: 35945143 PMCID: PMC9643622 DOI: 10.1002/chem.202202266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Indexed: 01/11/2023]
Abstract
A synthesis of a δ-ketohydroperoxide is described, addressing potential functional-group compatibilities in these elusive species relevant to combustion and atmospheric chemistries. The hydroperoxide is installed via sulfonylhydrazine substitution, which was found to be more effective than displacement of secondary halides. As part of this protocol, it was observed that 1,2-dimethoxyethane is an advantageous medium for the reaction, avoiding the formation of a tetrahydrofuran hydroperoxide side product. This discovery facilitated the multigram synthesis (6 steps, 41 % yield overall) and discrete characterization of the target δ-ketohydroperoxide.
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Affiliation(s)
- Yan‐Ting Ke
- Department of ChemistryUniversity of GeorgiaAthensGeorgia30602United States
| | - Bradley K. Gall
- Department of ChemistryUniversity of GeorgiaAthensGeorgia30602United States
| | - Nicholas S. Dewey
- Department of ChemistryUniversity of GeorgiaAthensGeorgia30602United States
| | - Brandon Rotavera
- Department of ChemistryUniversity of GeorgiaAthensGeorgia30602United States,College of EngineeringUniversity of GeorgiaAthensGeorgia30602United States
| | - Eric M. Ferreira
- Department of ChemistryUniversity of GeorgiaAthensGeorgia30602United States
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2
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Ning C, Rui KH, Wei Y, Shi M. Rh(i)-catalyzed dimerization of ene-vinylidenecyclopropanes for the construction of spiro[4,5]decanes and mechanistic studies. Chem Sci 2022; 13:7310-7317. [PMID: 35799819 PMCID: PMC9214856 DOI: 10.1039/d1sc06986a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 05/31/2022] [Indexed: 07/22/2023] Open
Abstract
Rh(i) complex catalyzed dimerization of ene-vinylidenecyclopropanes took place smoothly to construct a series of products containing spiro[4,5]decane skeletons featuring a simple operation procedure, mild reaction conditions, and good functional group tolerance. In this paper, the combination of experimental and computational studies reveals a counterion-assisted Rh(i)-Rh(iii)-Rh(v)-Rh(iii)-Rh(i) catalytic cycle involving tandem oxidative cyclometallation/reductive elimination/selective oxidative addition/selective reductive elimination/reductive elimination steps; in addition, a pentavalent spiro-rhodium intermediate is identified as the key intermediate in this dimerization reaction upon DFT calculation.
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Affiliation(s)
- Chao Ning
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Key Laboratory for Advanced Materials, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry & Molecular Engineering, East China University of Science and Technology Meilong Road No. 130 Shanghai 200237 China
| | - Kang-Hua Rui
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Key Laboratory for Advanced Materials, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry & Molecular Engineering, East China University of Science and Technology Meilong Road No. 130 Shanghai 200237 China
| | - Yin Wei
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, University of Chinese Academy of Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
| | - Min Shi
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Key Laboratory for Advanced Materials, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry & Molecular Engineering, East China University of Science and Technology Meilong Road No. 130 Shanghai 200237 China
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, University of Chinese Academy of Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
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3
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Abstract
An approach toward the 6-7-5 tricyclic carbon skeleton of the hamigeran natural products was developed. The key steps include a benzyne-β-ketoester annulative ring expansion to form the 7-membered ring, a Nazarov reaction to form the 5-membered ring, a Ni-catalyzed conjugate methyl addition or a Corey-Chaykovsky reaction to install the all-carbon quaternary center, and a Suzuki cross coupling followed by reduction to introduce the isopropyl group.
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Affiliation(s)
- Baiyang Jiang
- Department of Chemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States
| | - Mingji Dai
- Department of Chemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States
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4
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Zhang Q, Wang J, Wei Y, Zhai H, Li Y. Stereoselective Synthesis of Spiro-2-oxabicyclo[2.2.2]octane Enabled by Ag(I)/ Brønsted Acid Relay Catalysis. Org Lett 2019; 21:1694-1698. [DOI: 10.1021/acs.orglett.9b00251] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Qingyu Zhang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Jianping Wang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Yansheng Wei
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Hongbin Zhai
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - Yun Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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5
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Nelson DJ, Cazin CSJ, Nolan SP. Grignard Reagents and Palladium. PHYSICAL SCIENCES REVIEWS 2018. [DOI: 10.1515/psr-2016-0018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- David J. Nelson
- WestCHEM Department of Pure & Applied Chemistry University of Strathclyde 295 Cathedral Street Glasgow Lanarkshire , G1 1XL UK
| | - Catherine S. J. Cazin
- EaStCHEM School of Chemistry University of St Andrews Purdie Building North Haugh St Andrews Fife , KY16 9ST UK
| | - Steven P. Nolan
- Department of Inorganic and Physical Chemistry Ghent University Krijgslaan 281 - S3, 9000 Gent , Belgium
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6
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Huang JR, Sohail M, Taniguchi T, Monde K, Tanaka F. Formal (4+1) Cycloaddition and Enantioselective Michael-Henry Cascade Reactions To Synthesize Spiro[4,5]decanes and Spirooxindole Polycycles. Angew Chem Int Ed Engl 2017; 56:5853-5857. [DOI: 10.1002/anie.201701049] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Indexed: 01/01/2023]
Affiliation(s)
- Ji-Rong Huang
- Chemistry and Chemical Bioengineering Unit; Okinawa Institute of Science and Technology Graduate University; 1919-1 Tancha, Onna Okinawa 904-0495 Japan
| | - Muhammad Sohail
- Chemistry and Chemical Bioengineering Unit; Okinawa Institute of Science and Technology Graduate University; 1919-1 Tancha, Onna Okinawa 904-0495 Japan
| | - Tohru Taniguchi
- Frontier Research Center for Advanced Material and Life Science; Faculty of Advanced Life Science; Hokkaido University; Kita 21 Nishi 11 Sapporo 001-0021 Japan
| | - Kenji Monde
- Frontier Research Center for Advanced Material and Life Science; Faculty of Advanced Life Science; Hokkaido University; Kita 21 Nishi 11 Sapporo 001-0021 Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit; Okinawa Institute of Science and Technology Graduate University; 1919-1 Tancha, Onna Okinawa 904-0495 Japan
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7
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Huang JR, Sohail M, Taniguchi T, Monde K, Tanaka F. Formal (4+1) Cycloaddition and Enantioselective Michael-Henry Cascade Reactions To Synthesize Spiro[4,5]decanes and Spirooxindole Polycycles. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701049] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ji-Rong Huang
- Chemistry and Chemical Bioengineering Unit; Okinawa Institute of Science and Technology Graduate University; 1919-1 Tancha, Onna Okinawa 904-0495 Japan
| | - Muhammad Sohail
- Chemistry and Chemical Bioengineering Unit; Okinawa Institute of Science and Technology Graduate University; 1919-1 Tancha, Onna Okinawa 904-0495 Japan
| | - Tohru Taniguchi
- Frontier Research Center for Advanced Material and Life Science; Faculty of Advanced Life Science; Hokkaido University; Kita 21 Nishi 11 Sapporo 001-0021 Japan
| | - Kenji Monde
- Frontier Research Center for Advanced Material and Life Science; Faculty of Advanced Life Science; Hokkaido University; Kita 21 Nishi 11 Sapporo 001-0021 Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit; Okinawa Institute of Science and Technology Graduate University; 1919-1 Tancha, Onna Okinawa 904-0495 Japan
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8
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Li SS, Wu L, Qin L, Zhu YQ, Su F, Xu YJ, Dong L. Iridium(III)-Catalyzed Tandem [3 + 2] Annulation: Synthesis of Spirocyclic Phosphoramide Derivatives. Org Lett 2016; 18:4214-7. [PMID: 27553969 DOI: 10.1021/acs.orglett.6b01895] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Shuai-Shuai Li
- Key
Laboratory of Drug-Targeting and Drug Delivery System of the Education
Ministry, West China School of Pharmacy, Sichuan University, Chengdu 610041,China
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Lin Wu
- Key
Laboratory of Drug-Targeting and Drug Delivery System of the Education
Ministry, West China School of Pharmacy, Sichuan University, Chengdu 610041,China
| | - Liu Qin
- Key
Laboratory of Drug-Targeting and Drug Delivery System of the Education
Ministry, West China School of Pharmacy, Sichuan University, Chengdu 610041,China
| | - Yu-Qin Zhu
- Key
Laboratory of Drug-Targeting and Drug Delivery System of the Education
Ministry, West China School of Pharmacy, Sichuan University, Chengdu 610041,China
| | - Fu Su
- Key
Laboratory of Drug-Targeting and Drug Delivery System of the Education
Ministry, West China School of Pharmacy, Sichuan University, Chengdu 610041,China
| | - Yan-Jun Xu
- Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
| | - Lin Dong
- Key
Laboratory of Drug-Targeting and Drug Delivery System of the Education
Ministry, West China School of Pharmacy, Sichuan University, Chengdu 610041,China
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9
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Tymtsunik AV, Kokhan SO, Ivon YM, Komarov IV, Grygorenko OO. Intramolecular functional group differentiation as a strategy for the synthesis of bridged bicyclic β-amino acids. RSC Adv 2016. [DOI: 10.1039/c6ra01548d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Differentiation of identical electrophilic functional groups (carboxylates) by a strategically placed internal nucleophile (an amino group) in cyclic precursors was used as a key general approach to functionalized azabicyclic scaffolds.
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Affiliation(s)
- Andriy V. Tymtsunik
- National Taras Shevchenko University of Kyiv
- Kyiv 01601
- Ukraine
- Enamine Ltd
- Kyiv 01103
| | - Serhii O. Kokhan
- National Taras Shevchenko University of Kyiv
- Kyiv 01601
- Ukraine
- Enamine Ltd
- Kyiv 01103
| | - Yevhen M. Ivon
- National Taras Shevchenko University of Kyiv
- Kyiv 01601
- Ukraine
- Enamine Ltd
- Kyiv 01103
| | - Igor V. Komarov
- National Taras Shevchenko University of Kyiv
- Kyiv 01601
- Ukraine
- Enamine Ltd
- Kyiv 01103
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10
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Shen M, Tu Y, Xie G, Niu Q, Mao H, Xie T, Flowers RA, Lv X, Wang X. Allylsamarium Bromide-Mediated Cascade Cyclization of Homoallylic Esters. Synthesis of 2-(2-Hydroxyalkyl)cyclopropanols and 2-(2-Hydroxyethyl)bicyclo[2.1.1]hexan-1-ols. J Org Chem 2015; 80:52-61. [PMID: 25427109 DOI: 10.1021/jo501797w] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In continuation of our previous study on the intramolecular reductive coupling of simple homoallylic esters promoted by allylSmBr/HMPA/H2O, which afforded a facile synthesis of 2-(2-hydroxyalkyl)cyclopropanols, here we report the reductive cascade cyclization of but-3-enyl but-3-enoates mediated by allylSmBr/HMPA/CuCl2·2H2O, in which the two C═C bonds were successively coupled to allow the construction of the structurally interesting bridged bicyclic tertiary alcohols. Thus, the 2-(2-hydroxyethyl)bicyclo[2.1.1]hexan-1-ols were prepared in moderate to good yields with excellent diastereoselectivity.
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Affiliation(s)
- Mengmeng Shen
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Yawei Tu
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Guanqun Xie
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Qingsheng Niu
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Hui Mao
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Tingting Xie
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Robert A Flowers
- ‡Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Xin Lv
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Xiaoxia Wang
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
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11
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Szostak M, Fazakerley NJ, Parmar D, Procter DJ. Cross-Coupling Reactions Using Samarium(II) Iodide. Chem Rev 2014; 114:5959-6039. [DOI: 10.1021/cr400685r] [Citation(s) in RCA: 290] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Michal Szostak
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Neal J. Fazakerley
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Dixit Parmar
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - David J. Procter
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
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12
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Mondal S, Yetra SR, Patra A, Kunte SS, Gonnade RG, Biju AT. N-Heterocyclic carbene-catalyzed enantioselective synthesis of functionalized cyclopentenes via α,β-unsaturated acyl azoliums. Chem Commun (Camb) 2014; 50:14539-42. [DOI: 10.1039/c4cc07433e] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Highly enantioselective NHC-organocatalyzed synthesis of functionalized cyclopentenes by the reaction of modified enals with malonic ester derivatives having a γ-benzoyl group is reported.
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Affiliation(s)
- Santigopal Mondal
- Organic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune-411008, India
| | | | - Atanu Patra
- Organic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune-411008, India
| | - Sunita S. Kunte
- Organic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune-411008, India
| | - Rajesh G. Gonnade
- Centre for Materials Characterization
- CSIR-National Chemical Laboratory
- Pune-411008, India
| | - Akkattu T. Biju
- Organic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune-411008, India
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13
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Beemelmanns C, Gross S, Reissig HU. Towards the Core Structure ofStrychnosAlkaloids Using Samarium Diiodide-Induced Reactions of Indole Derivatives. Chemistry 2013; 19:17801-8. [DOI: 10.1002/chem.201302795] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Indexed: 01/03/2023]
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14
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Sadasivam DV, Choquette KA, Flowers RA. Preparation and use of samarium diiodide (SmI(2)) in organic synthesis: the mechanistic role of HMPA and Ni(II) salts in the samarium Barbier reaction. J Vis Exp 2013:e4323. [PMID: 23407417 PMCID: PMC3597118 DOI: 10.3791/4323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Although initially considered an esoteric reagent, SmI(2) has become a common tool for synthetic organic chemists. SmI(2) is generated through the addition of molecular iodine to samarium metal in THF.(1,2-3) It is a mild and selective single electron reductant and its versatility is a result of its ability to initiate a wide range of reductions including C-C bond-forming and cascade or sequential reactions. SmI(2) can reduce a variety of functional groups including sulfoxides and sulfones, phosphine oxides, epoxides, alkyl and aryl halides, carbonyls, and conjugated double bonds.(2-12) One of the fascinating features of SmI-(2)-mediated reactions is the ability to manipulate the outcome of reactions through the selective use of cosolvents or additives. In most instances, additives are essential in controlling the rate of reduction and the chemo- or stereoselectivity of reactions.(13-14) Additives commonly utilized to fine tune the reactivity of SmI(2) can be classified into three major groups: (1) Lewis bases (HMPA, other electron-donor ligands, chelating ethers, etc.), (2) proton sources (alcohols, water etc.), and (3) inorganic additives (Ni(acac)(2), FeCl(3), etc).(3) Understanding the mechanism of SmI(2) reactions and the role of the additives enables utilization of the full potential of the reagent in organic synthesis. The Sm-Barbier reaction is chosen to illustrate the synthetic importance and mechanistic role of two common additives: HMPA and Ni(II) in this reaction. The Sm-Barbier reaction is similar to the traditional Grignard reaction with the only difference being that the alkyl halide, carbonyl, and Sm reductant are mixed simultaneously in one pot.(1,15) Examples of Sm-mediated Barbier reactions with a range of coupling partners have been reported,(1,3,7,10,12) and have been utilized in key steps of the synthesis of large natural products.(16,17) Previous studies on the effect of additives on SmI(2) reactions have shown that HMPA enhances the reduction potential of SmI(2) by coordinating to the samarium metal center, producing a more powerful,(13-14,18) sterically encumbered reductant(19-21) and in some cases playing an integral role in post electron-transfer steps facilitating subsequent bond-forming events.(22) In the Sm-Barbier reaction, HMPA has been shown to additionally activate the alkyl halide by forming a complex in a pre-equilibrium step.(23) Ni(II) salts are a catalytic additive used frequently in Sm-mediated transformations.(24-27) Though critical for success, the mechanistic role of Ni(II) was not known in these reactions. Recently it has been shown that SmI(2) reduces Ni(II) to Ni(0), and the reaction is then carried out through organometallic Ni(0) chemistry.(28) These mechanistic studies highlight that although the same Barbier product is obtained, the use of different additives in the SmI(2) reaction drastically alters the mechanistic pathway of the reaction. The protocol for running these SmI(2)-initiated reactions is described.
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15
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Honda T. Investigation of innovative synthesis of biologically active compounds on the basis of newly developed reactions. Chem Pharm Bull (Tokyo) 2012; 60:687-705. [PMID: 22689419 DOI: 10.1248/cpb.60.687] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Synthesis of biologically active compounds, including natural products and pharmaceutical agents, is an important and interesting research area since the large structural diversity and complexity of bioactive compounds make them an important source of leads and scaffolds in drug discovery and development. Many structurally and also biologically interesting compounds, including marine natural products, have been isolated from nature and have also been prepared on the basis of a computational design for the purpose of developing medicinal chemistry. In order to obtain a wide variety of derivatives of biologically active compounds from the viewpoint of medicinal chemistry, it is essential to establish efficient synthetic procedures for desired targets. Newly developed reactions should also be used for efficient synthesis of desired compounds. Thus, recent progress in the synthesis of biologically active compounds by focusing on the development of new reactions is summarized in this review article.
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Affiliation(s)
- Toshio Honda
- Faculty of Pharmaceutical Sciences, Hoshi University, Shinagawa-ku, Tokyo, Japan.
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16
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Wu J, Panek JS. Total synthesis of (-)-virginiamycin M2: application of crotylsilanes accessed by enantioselective Rh(II) or Cu(I) promoted carbenoid Si-H insertion. J Org Chem 2011; 76:9900-18. [PMID: 22070230 DOI: 10.1021/jo202119p] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A stereoselective synthesis of the antibiotic (-)-virginiamycin M(2) is detailed. A convergent strategy was utilized that proceeded in 10 steps (longest linear sequence) from enantioenriched silane (S)-15. This reagent, which was prepared via a Rh(II)- or Cu(I)-catalyzed carbenoid Si-H insertion, was used to introduce the desired olefin geometry and stereocenters of the C1-C5 propionate subunit. A modified Negishi cross-coupling or an efficient alkoxide-directed titanium-mediated alkyne-alkyne reductive coupling strategy was utilized to assemble the trisubstituted (E,E)-diene. An underutilized late-stage SmI(2)-mediated macrocyclization was employed to construct the 23-membered macrocycle scaffold of the natural product.
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Affiliation(s)
- Jie Wu
- Department of Chemistry and Center for Chemical Methodology and Library Development, Metcalf Center for Science and Engineering, 590 Commonwealth Avenue, Boston University, Boston, Massachusetts 02215, USA
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