1
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Li Y, Shi H, Yin G. Synthetic techniques for thermodynamically disfavoured substituted six-membered rings. Nat Rev Chem 2024; 8:535-550. [PMID: 38822206 DOI: 10.1038/s41570-024-00612-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/26/2024] [Indexed: 06/02/2024]
Abstract
Six-membered rings are ubiquitous structural motifs in bioactive compounds and multifunctional materials. Notably, their thermodynamically disfavoured isomers, like disubstituted cyclohexanes featuring one substituent in an equatorial position and the other in an axial position, often exhibit enhanced physical and biological activities in comparison with their opposite isomers. However, the synthesis of thermodynamically disfavoured isomers is, by its nature, challenging, with only a limited number of possible approaches. In this Review, we summarize and compare synthetic methodologies that produce substituted six-membered rings with thermodynamically disfavoured substitution patterns. We place particular emphasis on elucidating the crucial stereoinduction factors within each transformation. Our aim is to stimulate interest in the synthesis of these unique structures, while simultaneously providing synthetic chemists with a guide to approaching this synthetic challenge.
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Affiliation(s)
- Yangyang Li
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei Province, China
| | - Hongjin Shi
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei Province, China
| | - Guoyin Yin
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei Province, China.
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2
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Zhou J, Meng L, Yang Z, Wang JJ. Enantio- and Regioselective Cascade Hydroboration of Methylenecyclopropanes for Facile Access to Chiral 1,3- and 1,4-Bis(boronates). ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2400096. [PMID: 38477439 DOI: 10.1002/advs.202400096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 02/06/2024] [Indexed: 03/14/2024]
Abstract
Chiral 1, n-bis(boronate) plays a crucial role in organic synthesis and medicinal chemistry. However, their catalytic and asymmetric synthesis has long posed a challenge in terms of operability and accessibility from readily available substrates. The recent discovery of the C═C bond formation through β-C elimination of methylenecyclopropanes (MCP) has provided an exciting opportunity to enhance molecular complexity. In this study, the catalyzed asymmetric cascade hydroboration of MCP is developed. By employing different ligands, various homoallylic boronate intermediate are obtained through the hydroboration ring opening process. Subsequently, the cascade hydroboration with HBpin or B2pin2 resulted in the synthesis of enantioenriched chiral 1,3- and 1,4-bis(boronates) in high yields, accompanied by excellent chemo- and enantioselectivities. The selective transformation of these two distinct C─B bonds also demonstrated their application potential in organic synthesis.
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Affiliation(s)
- Jian Zhou
- Department of Chemistry, Hong Kong Baptist University, Kowloon, Hong Kong, China
| | - Ling Meng
- Department of Chemistry, Hong Kong Baptist University, Kowloon, Hong Kong, China
| | - Ziyi Yang
- Department of Chemistry, Hong Kong Baptist University, Kowloon, Hong Kong, China
| | - Jun Joelle Wang
- Department of Chemistry, Hong Kong Baptist University, Kowloon, Hong Kong, China
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3
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Zheng W, Tan BB, Ge S, Lu Y. Enantioselective Copper-Catalyzed Ring-Opening Diboration of Arylidenecyclopropanes to Access Chiral Skipped 1,4- and 1,3-Diboronates. J Am Chem Soc 2024; 146:5366-5374. [PMID: 38354313 DOI: 10.1021/jacs.3c12675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
Two enantioselective approaches to synthesize chiral skipped diboronate compounds have been developed, relying on copper-catalyzed one-pot asymmetric ring-opening diboration of arylidenecyclopropanes. A wide range of arylidenecyclopropanes react smoothly with HBpin in the presence of CuOAc and (R)-DTBM-Segphos, affording chiral 1,4-diboronates with high enantioselectivity (up to 99% ee). Meanwhile, a variety of arylidenecyclopropanes react selectively with HBpin and B2pin2 in the presence of CuOAc and (S,S)-Ph-BPE with the sequential addition of MeOH, providing chiral 1,3-diboronates with high enantioselectivity (up to 98% ee). These enantioenriched 1,3- and 1,4-diboronates can undergo various enantiospecific transformations with minimal loss of their enantiopurity. Mechanistic studies reveal that these two diboration processes start with CuH-catalyzed ring-opening hydroboration of arylidenecyclopropanes to form a mixture of Z/E-homoallyl boronate intermediates, which subsequently undergo enantioselective CuH-catalyzed second hydroboration or Cu-Bpin-catalyzed protoboration to produce chiral 1,4-diboronates or 1,3-diboronates, respectively.
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Affiliation(s)
- Wenrui Zheng
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Boon Beng Tan
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Shaozhong Ge
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Yixin Lu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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4
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Pellissier H. TADDOL-derived phosphorus ligands in asymmetric catalysis. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2023.215079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
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5
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Chen C, Wang H, Li T, Lu D, Li J, Zhang X, Hong X, Lu Z. Cobalt‐Catalyzed Asymmetric Sequential Hydroboration/Isomerization/Hydroboration of 2‐Aryl Vinylcyclopropanes. Angew Chem Int Ed Engl 2022; 61:e202205619. [DOI: 10.1002/anie.202205619] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Indexed: 12/15/2022]
Affiliation(s)
- Chenhui Chen
- Department of Chemistry Zhejiang University Hangzhou 310058 China
| | - Hongliang Wang
- Department of Chemistry Zhejiang University Hangzhou 310058 China
- School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China
| | - Tongtong Li
- Department of Chemistry Zhejiang University Hangzhou 310058 China
| | - Dongpo Lu
- Department of Chemistry Zhejiang University Hangzhou 310058 China
| | - Jiajing Li
- Department of Chemistry Zhejiang University Hangzhou 310058 China
| | - Xie Zhang
- Department of Chemistry Zhejiang University Hangzhou 310058 China
| | - Xin Hong
- Department of Chemistry Zhejiang University Hangzhou 310058 China
- Center of Chemistry for Frontier Technologies State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China
- Beijing National Laboratory for Molecular Sciences Zhongguancun North First Street NO. 2 Beijing 100190 China
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
| | - Zhan Lu
- Department of Chemistry Zhejiang University Hangzhou 310058 China
- College of Chemistry Zhengzhou University Zhengzhou 450001 China
- Center of Chemistry for Frontier Technologies Zhejiang University Hangzhou 310027 China
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6
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Cobalt‐Catalyzed Asymmetric Sequential Hydroboration/Isomerization/Hydroboration of 2‐Aryl Vinylcyclopropanes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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7
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Chen Y, Dang L, Ho CY. NHC-Ni catalyzed enantioselective synthesis of 1,4-dienes by cross-hydroalkenylation of cyclic 1,3-dienes and heterosubstituted terminal olefins. Nat Commun 2020; 11:2269. [PMID: 32385240 PMCID: PMC7210895 DOI: 10.1038/s41467-020-16139-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 04/14/2020] [Indexed: 01/03/2023] Open
Abstract
Enantioenriched 1,4-dienes are versatile building blocks in asymmetric synthesis, therefore their efficient synthesis directly from chemical feedstock is highly sought after. Here, we show an enantioselective cross-hydroalkenylation of cyclic 1,3-diene and hetero-substituted terminal olefin by using a chiral [NHC-Ni(allyl)]BArF catalyst. Using a structurally flexible chiral C2 NHC-Ni design is key to access a broad scope of chiral 1,4-diene 3 or 3' with high enantioselectivity. This study also offers insights on how to regulate chiral C2 NHC-Ni(II) 1,3-allylic shift on cyclic diene 1 and to build sterically more hindered endocyclic chiral allylic structures on demand.
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Affiliation(s)
- Yang Chen
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Liang Dang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China.
| | - Chun-Yu Ho
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China.
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8
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Li G, Huo X, Jiang X, Zhang W. Asymmetric synthesis of allylic compounds via hydrofunctionalisation and difunctionalisation of dienes, allenes, and alkynes. Chem Soc Rev 2020; 49:2060-2118. [DOI: 10.1039/c9cs00400a] [Citation(s) in RCA: 133] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This review article provides an overview of progress in asymmetric synthesis of allylic compounds via hydrofunctionalisation and difunctionalisation of dienes, allenes, and alkynes.
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Affiliation(s)
- Guanlin Li
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Xiaohong Huo
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Xieyang Jiang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Wanbin Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
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9
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Maza RJ, Davenport E, Miralles N, Carbó JJ, Fernández E. Transition-Metal-Free Allylic Borylation of 1,3-Dienes. Org Lett 2019; 21:2251-2255. [DOI: 10.1021/acs.orglett.9b00531] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ricardo J. Maza
- Department Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo l, 43007 Tarragona, Spain
| | - Elliot Davenport
- Department Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo l, 43007 Tarragona, Spain
- Department of Chemistry, Edinburgh University, Edinburgh EH9 3FJ, United Kingdom
| | - Núria Miralles
- Department Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo l, 43007 Tarragona, Spain
| | - Jorge J. Carbó
- Department Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo l, 43007 Tarragona, Spain
| | - Elena Fernández
- Department Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo l, 43007 Tarragona, Spain
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10
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Diner C, Szabó KJ. Recent Advances in the Preparation and Application of Allylboron Species in Organic Synthesis. J Am Chem Soc 2016; 139:2-14. [DOI: 10.1021/jacs.6b10017] [Citation(s) in RCA: 189] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Colin Diner
- Department of Organic Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Kálmán J. Szabó
- Department of Organic Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
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11
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Lee WS, Byun S, Kwon J, Kim BM. Magnetic Pd-Fe3O4Heterodimer Nanocrystals as Recoverable Catalysts for Ligand-Free Hiyama Cross-Coupling Reactions. B KOREAN CHEM SOC 2016. [DOI: 10.1002/bkcs.11013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Woong-Sup Lee
- Department of Chemistry, College of Natural Sciences; Seoul National University; Seoul 08826 Republic of Korea
| | - Sangmoon Byun
- Department of Chemistry, College of Natural Sciences; Seoul National University; Seoul 08826 Republic of Korea
| | - Jungmin Kwon
- Department of Chemistry, College of Natural Sciences; Seoul National University; Seoul 08826 Republic of Korea
| | - B. Moon Kim
- Department of Chemistry, College of Natural Sciences; Seoul National University; Seoul 08826 Republic of Korea
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12
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Neeve EC, Geier SJ, Mkhalid IAI, Westcott SA, Marder TB. Diboron(4) Compounds: From Structural Curiosity to Synthetic Workhorse. Chem Rev 2016; 116:9091-161. [PMID: 27434758 DOI: 10.1021/acs.chemrev.6b00193] [Citation(s) in RCA: 737] [Impact Index Per Article: 92.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Although known for over 90 years, only in the past two decades has the chemistry of diboron(4) compounds been extensively explored. Many interesting structural features and reaction patterns have emerged, and more importantly, these compounds now feature prominently in both metal-catalyzed and metal-free methodologies for the formation of B-C bonds and other processes.
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Affiliation(s)
- Emily C Neeve
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg , Würzburg 97074, Germany
| | - Stephen J Geier
- Mount Allison University , Department of Biochemistry and Chemistry, Sackville, New Brunswick E4L 1G8, Canada
| | | | - Stephen A Westcott
- Mount Allison University , Department of Biochemistry and Chemistry, Sackville, New Brunswick E4L 1G8, Canada
| | - Todd B Marder
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg , Würzburg 97074, Germany
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13
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Affiliation(s)
- Wenzhen Fu
- State Key Laboratory of Bio-Organic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Wenjun Tang
- State Key Laboratory of Bio-Organic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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14
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A atom-efficient cross-coupling reaction of aryl iodides with triarylbismuths catalyzed by immobilization of palladium(II)-Schiff base complex in MCM-41. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.01.052] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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15
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Guo X, Nelson AK, Slebodnick C, Santos WL. Regio- and Chemoselective Diboration of Allenes with Unsymmetrical Diboron: Formation of Vinyl and Allyl Boronic Acid Derivatives. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00387] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xi Guo
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Amanda K. Nelson
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Carla Slebodnick
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Webster L. Santos
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
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16
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Coombs JR, Zhang L, Morken JP. Enantiomerically enriched tris(boronates): readily accessible conjunctive reagents for asymmetric synthesis. J Am Chem Soc 2014; 136:16140-3. [PMID: 25387002 DOI: 10.1021/ja510081r] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The catalytic enantioselective diboration of vinyl boronate esters furnishes chiral tris(boronates) in a selective fashion. Subsequent deborylative alkylation occurs in a diastereoselective fashion, both for intermolecular and intramolecular processes.
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Affiliation(s)
- John R Coombs
- Department of Chemistry, Merkert Chemistry Center, Boston College , Chestnut Hill, Massachusetts 02467, United States
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17
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Luo Y, Roy ID, Madec AGE, Lam HW. Enantioselective Synthesis of Allylboronates and Allylic Alcohols by Copper-Catalyzed 1,6-Boration. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201310380] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Luo Y, Roy ID, Madec AGE, Lam HW. Enantioselective Synthesis of Allylboronates and Allylic Alcohols by Copper-Catalyzed 1,6-Boration. Angew Chem Int Ed Engl 2014; 53:4186-90. [DOI: 10.1002/anie.201310380] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 02/03/2014] [Indexed: 11/09/2022]
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19
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Toribatake K, Nishiyama H. Asymmetric Diboration of Terminal Alkenes with a Rhodium Catalyst and Subsequent Oxidation: Enantioselective Synthesis of Optically Active 1,2-Diols. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305181] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Toribatake K, Nishiyama H. Asymmetric diboration of terminal alkenes with a rhodium catalyst and subsequent oxidation: enantioselective synthesis of optically active 1,2-diols. Angew Chem Int Ed Engl 2013; 52:11011-5. [PMID: 24000239 DOI: 10.1002/anie.201305181] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 07/23/2013] [Indexed: 11/07/2022]
Abstract
Pin it down: A highly enantioselective diboration of terminal alkenes with chiral 1 and bis(pinacolato)diboron (B2 pin2 ) was realized. Subsequent oxidation of the diboron adducts with sodium peroxoborate readily gave the corresponding optically active 1,2-diols in high yields and high enantioselectivities.
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Affiliation(s)
- Kenji Toribatake
- Department of Applied Chemistry, Graduated School of Engineering, Nagoya University, Chikusa, Nagoya, 464-8603 (Japan) http://www.apchem.nagoya-u.ac.jp/06-II-1/nisilab/index.html
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21
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Coombs JR, Haeffner F, Kliman LT, Morken JP. Scope and mechanism of the Pt-catalyzed enantioselective diboration of monosubstituted alkenes. J Am Chem Soc 2013; 135:11222-31. [PMID: 23862690 PMCID: PMC3805123 DOI: 10.1021/ja4041016] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Pt-catalyzed enantioselective diboration of terminal alkenes can be accomplished in an enantioselective fashion in the presence of chiral phosphonite ligands. Optimal procedures and the substrate scope of this transformation are fully investigated. Reaction progress kinetic analysis and kinetic isotope effects suggest that the stereodefining step in the catalytic cycle is olefin migratory insertion into a Pt-B bond. Density functional theory analysis, combined with other experimental data, suggests that the insertion reaction positions platinum at the internal carbon of the substrate. A stereochemical model for this reaction is advanced that is in line both with these features and with the crystal structure of a Pt-ligand complex.
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Affiliation(s)
- John R. Coombs
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
| | - Fredrik Haeffner
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
| | - Laura T. Kliman
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
| | - James P. Morken
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
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22
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23
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Hong K, Morken JP. Catalytic enantioselective one-pot aminoborylation of aldehydes: a strategy for construction of nonracemic α-amino boronates. J Am Chem Soc 2013; 135:9252-4. [PMID: 23763463 DOI: 10.1021/ja402569j] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We report a strategy for the conversion of aldehydes to enantiomerically enriched α-amino boronates through the intermediacy of in situ-generated silylimines. This transformation is brought about by Pt-catalyzed asymmetric addition of B2(pin)2 across the imine double bond. An attractive feature of the intermediate diboration adduct is that it can be acylated directly and provides convenient access to important N-acyl α-amino boronic ester derivatives.
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Affiliation(s)
- Kai Hong
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
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24
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Ferris GE, Hong K, Roundtree IA, Morken JP. A catalytic enantioselective tandem allylation strategy for rapid terpene construction: application to the synthesis of pumilaside aglycon. J Am Chem Soc 2013; 135:2501-4. [PMID: 23390951 DOI: 10.1021/ja400506j] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Catalytic enantioselective 1,2-diboration of 1,3-dienes followed by cascade allylborations with dicarbonyls provides rapid entry into carbocyclic reaction products. The stereochemical course of this reaction was studied along with its application in the synthesis of pumilaside aglycon.
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Affiliation(s)
- Grace E Ferris
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, USA
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25
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Smith SM, Hoang GL, Pal R, Bani Khaled MO, Pelter LSW, Zeng XC, Takacs JM. γ-Selective directed catalytic asymmetric hydroboration of 1,1-disubstituted alkenes. Chem Commun (Camb) 2012; 48:12180-2. [PMID: 23145431 PMCID: PMC3601746 DOI: 10.1039/c2cc36199j] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Directed catalytic asymmetric hydroborations of 1,1-disubstituted alkenes afford γ-dioxaborato amides and esters in high enantiomeric purity (90-95% ee).
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Affiliation(s)
- Sean M. Smith
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA, Fax: (+) 402 472-9402; Tel: (+) 402 472-6232
| | - Gia L. Hoang
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA, Fax: (+) 402 472-9402; Tel: (+) 402 472-6232
| | - Rhitankar Pal
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA, Fax: (+) 402 472-9402; Tel: (+) 402 472-6232
| | - Mohammad O. Bani Khaled
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA, Fax: (+) 402 472-9402; Tel: (+) 402 472-6232
| | - Liberty S. W. Pelter
- Department of Chemistry and Physics, Purdue University Calumet, Hammond, Indiana, USA
| | - Xiao Cheng Zeng
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA, Fax: (+) 402 472-9402; Tel: (+) 402 472-6232
| | - James M. Takacs
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA, Fax: (+) 402 472-9402; Tel: (+) 402 472-6232
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26
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Leung JC, Geary LM, Chen TY, Zbieg JR, Krische MJ. Direct, redox-neutral prenylation and geranylation of secondary carbinol C-H bonds: C4-regioselectivity in ruthenium-catalyzed C-C couplings of dienes to α-hydroxy esters. J Am Chem Soc 2012; 134:15700-3. [PMID: 22985393 PMCID: PMC3459341 DOI: 10.1021/ja3075049] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ruthenium catalyst generated in situ from Ru(3)(CO)(12) and tricyclohexylphosphine, PCy(3), promotes the redox-neutral C-C coupling of aryl-substituted α-hydroxy esters to isoprene and myrcene at the diene C4-position, resulting in direct carbinol C-H prenylation and geranylation, respectively. This process enables direct conversion of secondary to tertiary alcohols in the absence of stoichiometric byproducts or premetalated reagents, and is the first example of C4-regioselectivity in catalytic C-C couplings of 2-substituted dienes to carbonyl partners. Mechanistic studies corroborate a catalytic cycle involving diene-carbonyl oxidative coupling.
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Affiliation(s)
- Joyce C Leung
- Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, United States
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Affiliation(s)
- Jun Takaya
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551,
Japan
| | - Nobuharu Iwasawa
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551,
Japan
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Pichota A, Gramlich V, Bichsel HU, Styner T, Knöpfel T, Wünsch R, Hintermann T, Schweizer WB, Beck AK, Seebach D. Preparation and Characterization of New C2- and C1-Symmetric Nitrogen, Oxygen, Phosphorous, and Sulfur Derivatives and Analogs of TADDOL. Part II. Helv Chim Acta 2012. [DOI: 10.1002/hlca.201200147] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Bonet A, Sole C, Gulyás H, Fernández E. Asymmetric organocatalytic diboration of alkenes. Org Biomol Chem 2012; 10:6621-3. [DOI: 10.1039/c2ob26079d] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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