1
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Muto K, Kumagai T, Kakiuchi F, Kochi T. Remote Arylative Substitution of Alkenes Possessing an Acetoxy Group via β-Acetoxy Elimination. Angew Chem Int Ed Engl 2021; 60:24500-24504. [PMID: 34510680 DOI: 10.1002/anie.202111396] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Indexed: 12/14/2022]
Abstract
Palladium-catalyzed remote arylative substitution was achieved for the reaction of arylboronic acids with alkenes possessing a distant acetoxy group to provide arylation products having an alkene moiety at the remote position. The use of β-acetoxy elimination as a key step in the catalytic cycle allowed for regioselective formation of unstabilized alkenes after chain walking. This reaction was applicable to various arylboronic acids as well as alkene substrates.
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Affiliation(s)
- Kazuma Muto
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Takaaki Kumagai
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Fumitoshi Kakiuchi
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Takuya Kochi
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
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2
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Muto K, Kumagai T, Kakiuchi F, Kochi T. Remote Arylative Substitution of Alkenes Possessing an Acetoxy Group via β‐Acetoxy Elimination. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202111396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kazuma Muto
- Department of Chemistry Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Takaaki Kumagai
- Department of Chemistry Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Fumitoshi Kakiuchi
- Department of Chemistry Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Takuya Kochi
- Department of Chemistry Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
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3
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Suresh R, Massad I, Marek I. Stereoselective tandem iridium-catalyzed alkene isomerization-cope rearrangement of ω-diene epoxides: efficient access to acyclic 1,6-dicarbonyl compounds. Chem Sci 2021; 12:9328-9332. [PMID: 34349902 PMCID: PMC8278922 DOI: 10.1039/d1sc02575a] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 06/03/2021] [Indexed: 01/05/2023] Open
Abstract
The Cope rearrangement of 2,3-divinyloxiranes, a rare example of epoxide C-C bond cleavage, results in 4,5-dihydrooxepines which are amenable to hydrolysis, furnishing 1,6-dicarbonyl compounds containing two contiguous stereocenters at the 3- and 4-positions. We employ an Ir-based alkene isomerization catalyst to form the reactive 2,3-divinyloxirane in situ with complete regio- and stereocontrol, which translates into excellent control over the stereochemistry of the resulting oxepines and ultimately to an attractive strategy towards 1,6-dicarbonyl compounds.
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Affiliation(s)
- Rahul Suresh
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology Technion City 3200009 Haifa Israel
| | - Itai Massad
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology Technion City 3200009 Haifa Israel
| | - Ilan Marek
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology Technion City 3200009 Haifa Israel
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4
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Wang X, Cui P, Xia C, Wu L. Catalytic Boration of Alkyl Halides with Borane without Hydrodehalogenation Enabled by Titanium Catalyst. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Xianjin Wang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Penglei Cui
- College of Science Hebei Agricultural University Baoding 071001 P. R. China
| | - Chungu Xia
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
| | - Lipeng Wu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
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5
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Wang X, Cui P, Xia C, Wu L. Catalytic Boration of Alkyl Halides with Borane without Hydrodehalogenation Enabled by Titanium Catalyst. Angew Chem Int Ed Engl 2021; 60:12298-12303. [DOI: 10.1002/anie.202100569] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Indexed: 12/22/2022]
Affiliation(s)
- Xianjin Wang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Penglei Cui
- College of Science Hebei Agricultural University Baoding 071001 P. R. China
| | - Chungu Xia
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
| | - Lipeng Wu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
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6
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Wang X, Cui X, Li S, Wang Y, Xia C, Jiao H, Wu L. Zirconium‐Catalyzed Atom‐Economical Synthesis of 1,1‐Diborylalkanes from Terminal and Internal Alkenes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002642] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Xianjin Wang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Xin Cui
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
| | - Sida Li
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
| | - Yue Wang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
| | - Chungu Xia
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
| | - Haijun Jiao
- Leibniz-Institut für Katalyse e. V. Albert-Einstein-Strasse 29a 18059 Rostock Germany
| | - Lipeng Wu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 P. R. China
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7
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Wang X, Cui X, Li S, Wang Y, Xia C, Jiao H, Wu L. Zirconium-Catalyzed Atom-Economical Synthesis of 1,1-Diborylalkanes from Terminal and Internal Alkenes. Angew Chem Int Ed Engl 2020; 59:13608-13612. [PMID: 32297413 PMCID: PMC7496309 DOI: 10.1002/anie.202002642] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Indexed: 12/23/2022]
Abstract
A general and atom‐economical synthesis of 1,1‐diborylalkanes from alkenes and a borane without the need for an additional H2 acceptor is reported for the first time. The key to our success is the use of an earth‐abundant zirconium‐based catalyst, which allows a balance of self‐contradictory reactivities (dehydrogenative boration and hydroboration) to be achieved. Our method avoids using an excess amount of another alkene as an H2 acceptor, which was required in other reported systems. Furthermore, substrates such as simple long‐chain aliphatic alkenes that did not react before also underwent 1,1‐diboration in our system. Significantly, the unprecedented 1,1‐diboration of internal alkenes enabled the preparation of 1,1‐diborylalkanes.
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Affiliation(s)
- Xianjin Wang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Xin Cui
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
| | - Sida Li
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
| | - Yue Wang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
| | - Chungu Xia
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
| | - Haijun Jiao
- Leibniz-Institut für Katalyse e. V., Albert-Einstein-Strasse 29a, 18059, Rostock, Germany
| | - Lipeng Wu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
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8
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Ho GM, Segura L, Marek I. Ru-catalyzed isomerization of ω-alkenylboronates towards stereoselective synthesis of vinylboronates with subsequent in situ functionalization. Chem Sci 2020; 11:5944-5949. [PMID: 34094086 PMCID: PMC8159340 DOI: 10.1039/d0sc02542a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The stereoselective preparation of synthetically versatile vinylboronates from ω-alkenylboronates is achieved through a ruthenium-catalyzed isomerization reaction. A variety of di- and trisubstituted vinylboronates were conveniently produced and could be used as a new starting point for subsequent in situ remote functionalization through either a sequential Ru/Pd or Ru/Cu double catalytic system. A regio- and stereoselective ruthenium-catalyzed isomerization of ω-alkenyl boronates into stereodefined di- and trisubstituted alkenylboronate derivatives is reported.![]()
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Affiliation(s)
- Guo-Ming Ho
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology Technion City 3200009 Haifa Israel
| | - Lucas Segura
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology Technion City 3200009 Haifa Israel
| | - Ilan Marek
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology Technion City 3200009 Haifa Israel
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9
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Affiliation(s)
- Christof Matt
- Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104 Freiburg im Breisgau, Germany
| | - Christoph Kern
- Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104 Freiburg im Breisgau, Germany
| | - Jan Streuff
- Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104 Freiburg im Breisgau, Germany
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10
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Romano C, Fiorito D, Mazet C. Remote Functionalization of α,β-Unsaturated Carbonyls by Multimetallic Sequential Catalysis. J Am Chem Soc 2019; 141:16983-16990. [DOI: 10.1021/jacs.9b09373] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Ciro Romano
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Daniele Fiorito
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Clément Mazet
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
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11
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Ho GM, Sommer H, Marek I. Highly E-Selective, Stereoconvergent Nickel-Catalyzed Suzuki-Miyaura Cross-Coupling of Alkenyl Ethers. Org Lett 2019; 21:2913-2917. [PMID: 30942604 PMCID: PMC7025807 DOI: 10.1021/acs.orglett.9b00946] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
![]()
An improved method
for the nickel-catalyzed Suzuki–Miyaura
cross-coupling of alkenyl ethers is reported. This stereoconvergent
protocol allows for the utilization of a wide range of alkenyl ethers
and aryl boronic esters for the synthesis of variously substituted
styrene derivatives. An olefinic mixture with respect to the alkenyl
ethers can be employed, thereby circumventing the stereodefined synthesis
of starting materials. Preliminary mechanistic investigations indicate
a nickel-catalyzed olefin isomerization following initial stereoretentive
cross-coupling.
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Affiliation(s)
- Guo-Ming Ho
- Schulich Faculty of Chemistry , Technion-Israel Institute of Technology , Technion City, Haifa , 3200009 , Israel
| | - Heiko Sommer
- Schulich Faculty of Chemistry , Technion-Israel Institute of Technology , Technion City, Haifa , 3200009 , Israel
| | - Ilan Marek
- Schulich Faculty of Chemistry , Technion-Israel Institute of Technology , Technion City, Haifa , 3200009 , Israel
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12
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Sommer H, Weissbrod T, Marek I. A Tandem Iridium-Catalyzed "Chain-Walking"/Cope Rearrangement Sequence. ACS Catal 2019; 9:2400-2406. [PMID: 32953237 PMCID: PMC7493306 DOI: 10.1021/acscatal.9b00118] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 01/30/2019] [Indexed: 12/17/2022]
Abstract
An iridium-catalyzed tandem olefin migration/Cope rearrangement of alkenyl ω-ene cyclopropanes is reported. By this means, a variety of complex annulenes are obtained as single diastereomers starting from cyclopropyl ester derived from simple 1,ω-dienes and alkenyldiazo compounds. Long-range olefin migration over up to 10 positions could be realized and coupled with an efficient Cope rearrangement to yield valuable scaffolds. Various functional groups are well-tolerated, giving rise to densely functionalized products. Furthermore, the present methodology could be successfully extended to yield bicyclic cycloheptenones starting from readily available alkenyl cyclopropanols via a Kulinkovich reaction.
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Affiliation(s)
- Heiko Sommer
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology, Technion City, Haifa, 32000, Israel
| | - Tal Weissbrod
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology, Technion City, Haifa, 32000, Israel
| | - Ilan Marek
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology, Technion City, Haifa, 32000, Israel
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13
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Huang RZ, Lau KK, Li Z, Liu TL, Zhao Y. Rhodium-Catalyzed Enantioconvergent Isomerization of Homoallylic and Bishomoallylic Secondary Alcohols. J Am Chem Soc 2018; 140:14647-14654. [DOI: 10.1021/jacs.8b07007] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Rui-Zhi Huang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Republic of Singapore 117543
| | - Kai Kiat Lau
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Republic of Singapore 117543
| | - Zhaofeng Li
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Tang-Lin Liu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Republic of Singapore 117543
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Yu Zhao
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Republic of Singapore 117543
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14
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Groves A, Martínez JI, Smith JJ, Lam HW. Remote Nucleophilic Allylation by Allylrhodium Chain Walking. Chemistry 2018; 24:13432-13436. [PMID: 30006953 DOI: 10.1002/chem.201803574] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Indexed: 12/12/2022]
Abstract
Metal migration through a carbon chain is a versatile method for achieving remote functionalization. However, almost all known examples involve the overall net migration of alkylmetal species. Here, we report that allylrhodium species obtained from hydrorhodation of 1,3-dienes undergo chain walking toward esters, amides, or (hetero)arenes over distances of up to eight methylene units. The final, more highly conjugated allylrhodium species undergo nucleophilic allylation with aldehydes and with an imine to give Z-homoallylic alcohols and amines, respectively.
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Affiliation(s)
- Alistair Groves
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable, Chemistry, University of Nottingham, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, UK.,School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Jose I Martínez
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Joshua J Smith
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Hon Wai Lam
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable, Chemistry, University of Nottingham, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, UK.,School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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15
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Ho G, Judkele L, Bruffaerts J, Marek I. Metal‐Catalyzed Remote Functionalization of ω‐Ene Unsaturated Ethers: Towards Functionalized Vinyl Species. Angew Chem Int Ed Engl 2018; 57:8012-8016. [DOI: 10.1002/anie.201802434] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Revised: 04/23/2018] [Indexed: 01/10/2023]
Affiliation(s)
- Guo‐Ming Ho
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology Haifa 32000 Israel
| | - Lina Judkele
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology Haifa 32000 Israel
| | - Jeffrey Bruffaerts
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology Haifa 32000 Israel
| | - Ilan Marek
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology Haifa 32000 Israel
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16
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Ho G, Judkele L, Bruffaerts J, Marek I. Metal‐Catalyzed Remote Functionalization of ω‐Ene Unsaturated Ethers: Towards Functionalized Vinyl Species. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201802434] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Guo‐Ming Ho
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology Haifa 32000 Israel
| | - Lina Judkele
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology Haifa 32000 Israel
| | - Jeffrey Bruffaerts
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology Haifa 32000 Israel
| | - Ilan Marek
- Schulich Faculty of Chemistry, Technion—Israel Institute of Technology Haifa 32000 Israel
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17
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Bruffaerts J, Vasseur A, Singh S, Masarwa A, Didier D, Oskar L, Perrin L, Eisenstein O, Marek I. Zirconocene-Mediated Selective C-C Bond Cleavage of Strained Carbocycles: Scope and Mechanism. J Org Chem 2018. [PMID: 29537856 DOI: 10.1021/acs.joc.7b03115] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Several approaches using organozirconocene species for the remote cleavage of strained three-membered ring carbocycles are described. ω-Ene polysubstituted cyclopropanes, alkylidenecyclopropanes, ω-ene spiro[2.2]pentanes, and ω-ene cyclopropyl methyl ethers were successfully transformed into stereodefined organometallic intermediates, allowing an easy access to highly stereoenriched acyclic scaffolds in good yields and, in most cases, excellent selectivities. DFT calculations and isotopic labeling experiments were performed to delineate the origin of the obtained chemo- and stereoselectivities, demonstrating the importance of microreversibility.
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Affiliation(s)
- Jeffrey Bruffaerts
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry , Technion-Israel Institute of Technology , Haifa 3200009 , Israel
| | - Alexandre Vasseur
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry , Technion-Israel Institute of Technology , Haifa 3200009 , Israel
| | - Sukhdev Singh
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry , Technion-Israel Institute of Technology , Haifa 3200009 , Israel
| | - Ahmad Masarwa
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry , Technion-Israel Institute of Technology , Haifa 3200009 , Israel
| | - Dorian Didier
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry , Technion-Israel Institute of Technology , Haifa 3200009 , Israel
| | - Liron Oskar
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry , Technion-Israel Institute of Technology , Haifa 3200009 , Israel
| | - Lionel Perrin
- CPE Lyon, INSA Lyon, ICBMS, CNRS UMR 5246 , Université de Lyon, Université Claude Bernard Lyon 1 , Equipe ITEMM, Bât. Curien, 43 Bd. du 11 Novembre 1918 , 69622 Villeurbanne , France
| | - Odile Eisenstein
- Institut Charles Gerhardt, UMR 5253, CNRS-UM-ENSCM , Université de Montpellier , cc 1501, Place E. Bataillon , 34095 Montpellier , France
| | - Ilan Marek
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry , Technion-Israel Institute of Technology , Haifa 3200009 , Israel
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18
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Romano C, Mazet C. Multicatalytic Stereoselective Synthesis of Highly Substituted Alkenes by Sequential Isomerization/Cross-Coupling Reactions. J Am Chem Soc 2018; 140:4743-4750. [DOI: 10.1021/jacs.8b02134] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ciro Romano
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Clément Mazet
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
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19
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Alkene-Zipper Catalyzed Selective and Remote Retro-ene Reaction of Alkenyl Cyclopropylcarbinol. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201701481] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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20
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Singh S, Bruffaerts J, Vasseur A, Marek I. A unique Pd-catalysed Heck arylation as a remote trigger for cyclopropane selective ring-opening. Nat Commun 2017; 8:14200. [PMID: 28169276 PMCID: PMC5309700 DOI: 10.1038/ncomms14200] [Citation(s) in RCA: 109] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 12/07/2016] [Indexed: 12/16/2022] Open
Abstract
Combining functionalization at a distant position from a reactive site with the creation of several consecutive stereogenic centres, including the formation of a quaternary carbon stereocentre, in acyclic system represents a pinnacle in organic synthesis. Here we report the regioselective Heck arylation of terminal olefins as a distant trigger for the ring-opening of cyclopropanes. This Pd-catalysed unfolding of the strained cycle, driving force of the chain-walking process, remarkably proved its efficiency and versatility, as the reaction proceeded regardless of the molecular distance between the initiation (double bond) and termination (alcohol) sites. Moreover, employing stereodefined polysubstituted cyclopropane vaults allowed to access sophisticated stereoenriched acyclic scaffolds in good yields. Conceptually, we demonstrated that merging catalytically a chain walking process with a selective C-C bond cleavage represents a powerful approach to construct linear skeleton possessing two stereogenic centres.
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Affiliation(s)
- Sukhdev Singh
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry and the Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Jeffrey Bruffaerts
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry and the Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Alexandre Vasseur
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry and the Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Ilan Marek
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry and the Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
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21
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Merging allylic C-H bond activation and C-C bond cleavage en route to the formation of a quaternary carbon stereocenter in acyclic systems. Nat Protoc 2016; 12:74-87. [PMID: 27929522 DOI: 10.1038/nprot.2016.161] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
This protocol describes a diastereoselective approach for the synthesis of complex molecular architectures containing two stereogenic centers in a 1,4 relationship, one of which being an all-carbon quaternary stereogenic center. Such molecules could be intermediates in the synthesis of steroids, for example. Conceived as a single-flask synthetic sequence from ω-ene cyclopropanes, the protocol involves a concerted allylic C-H and C-C bond activation promoted by the Negishi reagent (Cp2Zr(η2-butene)). This zirconium-promenade-based procedure affords bifunctionalized products in high diastereomeric ratios after reaction of ω-ene cyclopropanes with the Negishi complex, followed by a thermal treatment and sequential addition of two different electrophiles. The method proves to be particularly efficient when carbonyl compounds are used as first electrophiles and hydrogen or elemental halides are used as second electrophiles. In addition, it offers the opportunity to create new C-C bonds via remote functionalization of a (sp3)-C-H bond, a result of a copper or copper/palladium transmetalation step that extends the scope of the process to alkyl, acyl and aromatic halide compounds as second electrophiles. The typical described protocol allows the synthesis of the highly diastereo-enriched 2-((1R*,2S*)-2-butyl-2 propylcyclopropyl)ethanol and may provide a new entry to access complex molecular segments of natural products such as steroids or C30 botryococcene. It requires a simple reaction setup and takes ∼18.5 h to run the reaction and 2 h for isolation and purification.
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22
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Bruffaerts J, Pierrot D, Marek I. Zirconocene-assisted remote cleavage of C-C and C-O bonds: application to acyclic stereodefined metalated hydrocarbons. Org Biomol Chem 2016; 14:10325-10330. [PMID: 27782275 DOI: 10.1039/c6ob01910b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The molding of molecules through remote functionalisation has increasingly become popular as it provides original and flexible synthetic alternatives to classical retrosynthetic analysis. In this Perspective article, we summarise more than a decade of studies in the specific field of remote activation of inert C-C and C-O bonds using the unique abilities of organozirconocene species mainly from our own research group. By demonstrating that these reactions represent novel and powerful entries towards acyclic stereodefined reactive organometallic species, we aim to show the vast opportunities this concept-driven methodology discovery offers.
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Affiliation(s)
- J Bruffaerts
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel.
| | - D Pierrot
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel.
| | - I Marek
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel.
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23
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Lin L, Romano C, Mazet C. Palladium-Catalyzed Long-Range Deconjugative Isomerization of Highly Substituted α,β-Unsaturated Carbonyl Compounds. J Am Chem Soc 2016; 138:10344-50. [DOI: 10.1021/jacs.6b06390] [Citation(s) in RCA: 146] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Luqing Lin
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Ciro Romano
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Clément Mazet
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
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24
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Vasseur A, Bruffaerts J, Marek I. Remote functionalization through alkene isomerization. Nat Chem 2016; 8:209-19. [DOI: 10.1038/nchem.2445] [Citation(s) in RCA: 372] [Impact Index Per Article: 46.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 12/17/2015] [Indexed: 12/23/2022]
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Martínez JI, Smith JJ, Hepburn HB, Lam HW. Chain Walking of Allylrhodium Species Towards Esters During Rhodium-Catalyzed Nucleophilic Allylations of Imines. Angew Chem Int Ed Engl 2016; 55:1108-12. [PMID: 26756445 PMCID: PMC4736453 DOI: 10.1002/anie.201508964] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Revised: 11/04/2015] [Indexed: 11/10/2022]
Abstract
Allylrhodium species derived from δ-trifluoroboryl β,γ-unsaturated esters undergo chain walking towards the ester moiety. The resulting allylrhodium species react with imines to give products containing two new stereocenters and a Z-alkene. By using a chiral diene ligand, products can be obtained with high enantioselectivities, where a pronounced matched/mismatched effect with the chirality of the allyltrifluoroborate is evident.
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Affiliation(s)
- Jose I Martínez
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Joshua J Smith
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Hamish B Hepburn
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Hon Wai Lam
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
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26
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Martínez JI, Smith JJ, Hepburn HB, Lam HW. Chain Walking of Allylrhodium Species Towards Esters During Rhodium-Catalyzed Nucleophilic Allylations of Imines. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508964] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Jose I. Martínez
- School of Chemistry; University of Nottingham; University Park Nottingham NG7 2RD UK
| | - Joshua J. Smith
- School of Chemistry; University of Nottingham; University Park Nottingham NG7 2RD UK
| | - Hamish B. Hepburn
- School of Chemistry; University of Nottingham; University Park Nottingham NG7 2RD UK
| | - Hon Wai Lam
- School of Chemistry; University of Nottingham; University Park Nottingham NG7 2RD UK
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27
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Song C, Dang Y, Tao Y, Wang ZX. DFT Mechanistic Study of Functionalizations of ω-Ene-Cyclopropanes and Alkylidenecyclopropanes via Allylic C–H and C–C Bond Cleavage Facilitated by a Zirconocene Complex. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00650] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chunyu Song
- School of Chemistry and Chemical
Engineering, University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Yanfeng Dang
- School of Chemistry and Chemical
Engineering, University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Yuan Tao
- School of Chemistry and Chemical
Engineering, University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Xiang Wang
- School of Chemistry and Chemical
Engineering, University of the Chinese Academy of Sciences, Beijing 100049, China
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28
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Vasseur A, Perrin L, Eisenstein O, Marek I. Remote functionalization of hydrocarbons with reversibility enhanced stereocontrol. Chem Sci 2015; 6:2770-2776. [PMID: 29142680 PMCID: PMC5654413 DOI: 10.1039/c5sc00445d] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 03/03/2015] [Indexed: 12/12/2022] Open
Abstract
Remote functionalization of hydrocarbons could be achieved through successive zirconocene-mediated allylic C-H bond activations followed by a selective C-C bond cleavage. Determination of the reaction mechanism by density functional theory (DFT) calculations shows that the high stereocontrol observed in this process results from a large number of energetically accessible equilibria feeding a preferred reactive channel that leads to the major product. A distinctive consequence of this pattern is that stereoselectivity is enhanced upon heating.
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Affiliation(s)
- Alexandre Vasseur
- The Mallat Family Laboratory of Organic Chemistry , Schulich Faculty of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry , Technion-Israel Institute of Technology , Technion City , Haifa 32000 , Israel . ; ; Tel: +972-4-829-37-09
| | - Lionel Perrin
- ICBMS UMR 5246 , Université de Lyon , Bat Curien, 43 Bd du 11 Novembre 1918 , 69622 Villeurbanne cedex , France .
| | - Odile Eisenstein
- Institut Charles Gerhardt , CNRS UMR 5253 , Université de Montpellier , cc 1501, Place E. Bataillon , 34095 Montpellier , France
| | - Ilan Marek
- The Mallat Family Laboratory of Organic Chemistry , Schulich Faculty of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry , Technion-Israel Institute of Technology , Technion City , Haifa 32000 , Israel . ; ; Tel: +972-4-829-37-09
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29
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Larionov E, Lin L, Guénée L, Mazet C. Scope and Mechanism in Palladium-Catalyzed Isomerizations of Highly Substituted Allylic, Homoallylic, and Alkenyl Alcohols. J Am Chem Soc 2014; 136:16882-94. [DOI: 10.1021/ja508736u] [Citation(s) in RCA: 154] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Evgeny Larionov
- Department
of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Luqing Lin
- Department
of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Laure Guénée
- Laboratory
of Crystallography, University of Geneva, 24 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Clément Mazet
- Department
of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
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30
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Marek I, Masarwa A, Delaye PO, Leibeling M. Selective Carbon-Carbon Bond Cleavage for the Stereoselective Synthesis of Acyclic Systems. Angew Chem Int Ed Engl 2014; 54:414-29. [DOI: 10.1002/anie.201405067] [Citation(s) in RCA: 264] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Indexed: 11/08/2022]
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31
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Marek I, Masarwa A, Delaye PO, Leibeling M. Selektive C-C-Bindungsspaltung zur stereoselektiven Synthese acyclischer Systeme. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405067] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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32
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Humbert N, Vyas DJ, Besnard C, Mazet C. An air-stable cationic iridium hydride as a highly active and general catalyst for the isomerization of terminal epoxides. Chem Commun (Camb) 2014; 50:10592-5. [DOI: 10.1039/c4cc05260a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We describe the use of an air-stable iridium hydride catalyst for the isomerization of terminal epoxides into aldehydes with perfect regioselectivity.
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Affiliation(s)
- Nicolas Humbert
- Department of Organic Chemistry
- University of Geneva
- 1211 Geneva-4, Switzerland
| | - Devendra J. Vyas
- Department of Organic Chemistry
- University of Geneva
- 1211 Geneva-4, Switzerland
| | - Céline Besnard
- Laboratoire de Cristallographie
- University of Geneva
- 1211 Geneva-4, Switzerland
| | - Clément Mazet
- Department of Organic Chemistry
- University of Geneva
- 1211 Geneva-4, Switzerland
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33
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Masarwa A, Didier D, Zabrodski T, Schinkel M, Ackermann L, Marek I. Merging allylic carbon–hydrogen and selective carbon–carbon bond activation. Nature 2013; 505:199-203. [DOI: 10.1038/nature12761] [Citation(s) in RCA: 193] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Accepted: 10/08/2013] [Indexed: 12/22/2022]
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34
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Jeganmohan M, Knochel P. tmp4Zr: eine atomökonomische Base zur Metallierung von funktionalisierten Arenen und Heteroarenen. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201003558] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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35
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Jeganmohan M, Knochel P. tmp4Zr: An Atom-Economical Base for the Metalation of Functionalized Arenes and Heteroarenes. Angew Chem Int Ed Engl 2010; 49:8520-4. [DOI: 10.1002/anie.201003558] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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36
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Simaan S, Masarwa A, Zohar E, Stanger A, Bertus P, Marek I. Cyclopropenylcarbinol Derivatives as New Versatile Intermediates in Organic Synthesis: Application to the Formation of Enantiomerically Pure Alkylidenecyclopropane Derivatives. Chemistry 2009; 15:8449-8464. [PMID: 19609999 DOI: 10.1002/chem.200901074] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Samah Simaan
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry, and the Lise Meitner-Minerva, Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000 (Israel), Fax: (+972) 4 829 3709
| | - Ahmad Masarwa
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry, and the Lise Meitner-Minerva, Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000 (Israel), Fax: (+972) 4 829 3709
| | - Elinor Zohar
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry, and the Lise Meitner-Minerva, Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000 (Israel), Fax: (+972) 4 829 3709
| | - Amnon Stanger
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry, and the Lise Meitner-Minerva, Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000 (Israel), Fax: (+972) 4 829 3709
| | - Philippe Bertus
- CNRS UMR 6011, Unite de Chimie Organique et Moleculaire (UCO2M), Universite du Maine, Avenue O. Messian, 72085 Le Mans Cedex 9 (France)
| | - Ilan Marek
- The Mallat Family Laboratory of Organic Chemistry, Schulich Faculty of Chemistry, and the Lise Meitner-Minerva, Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000 (Israel), Fax: (+972) 4 829 3709
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37
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Roy S, Planken KL, Kim R, Mandele DVD, Kegel WK. Direct Evidence on the Existence of [Mo132] Keplerate-Type Species in Aqueous Solution. Inorg Chem 2007; 46:8469-71. [PMID: 17850076 DOI: 10.1021/ic701076s] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We demonstrate the existence of discrete single molecular [Mo(132)] Keplerate-type clusters in aqueous solution. Starting from a discrete spherical [Mo(132)] cluster, the formation of an open-basket-type [Mo(116)] defect structure is shown for the first time in solution using analytical ultracentrifugation sedimentation velocity experiments.
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Affiliation(s)
- Soumyajit Roy
- Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
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Barluenga J, Álvarez-Rodrigo L, Rodríguez F, Fañanás FJ. Zirconocene-Catalyzed Reactions of Alkenyl-Substituted Enol Ethers. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200601959] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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40
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Barluenga J, Alvarez-Rodrigo L, Rodríguez F, Fañanás FJ. Zirconocene-Catalyzed Reactions of Alkenyl-Substituted Enol Ethers. Angew Chem Int Ed Engl 2006; 45:6362-5. [PMID: 16927439 DOI: 10.1002/anie.200601959] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- José Barluenga
- Instituto Universitario de Química Organometálica Enrique Moles, Unidad Asociada al C.S.I.C. Universidad de Oviedo, Julián Clavería 8, 33006 Oviedo, Spain.
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41
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Sklute G, Marek I. New Multicomponent Approach for the Creation of Chiral Quaternary Centers in the Carbonyl Allylation Reactions. J Am Chem Soc 2006; 128:4642-9. [PMID: 16594701 DOI: 10.1021/ja060498q] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The combined regio- and stereo-controlled carbometalation reaction of alkynyl sulfoxide followed by a zinc homologation and finally an allylation reaction led, in a single-pot operation, to chiral homoallylic alcohols in excellent yields and diastereoselectivities for the creation of chiral quaternary and tertiary centers. The key features in all of the reactions that are described in this article are the high degree of stereocontrol, the level of predictability, and "the ease of execution" which ensures success in the application of such methods. The chiral sulfinyl moiety can be finally removed by simple treatment with alkyllithiums, which allows further functionalizations of the carbon skeleton. By using one of these methods, the creation of chiral quaternary centers with the smallest possible difference, namely CD3 versus CH3 and 13CH3 versus CH3, was easily performed.
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Affiliation(s)
- Genia Sklute
- Mallat Family Laboratory of Organic Chemistry, Department of Chemistry, Institute of Catalysis Science and Technology and The Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Haifa 32000 Israel
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