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Rodríguez-Berríos RR, Isbel SR, Bugarin A. Epoxide-Based Synthetic Approaches toward Polypropionates and Related Bioactive Natural Products. Int J Mol Sci 2023; 24:6195. [PMID: 37047173 PMCID: PMC10094535 DOI: 10.3390/ijms24076195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/16/2023] [Accepted: 03/23/2023] [Indexed: 03/29/2023] Open
Abstract
Polypropionate units are a common structural feature of many of the natural products in polyketides, some of which have shown a broad range of antimicrobial and therapeutic potential. Polypropionates are composed of a carbon skeleton with alternating methyl and hydroxy groups with a specific configuration. Different approaches have been developed for the synthesis of polypropionates and herein we include, for the first time, all of the epoxide-based methodologies that have been reported over the years by several research groups such as Kishi, Katsuki, Marashall, Miyashita, Prieto, Sarabia, Jung, McDonald, etc. Several syntheses of polypropionate fragments and natural products that employed epoxides as key intermediates have been described and summarized in this review. These synthetic approaches involve enatio- and diastereoselective synthesis of epoxides (epoxy-alcohols, epoxy-amides, and epoxy-esters) and their regioselective cleavage with carbon and/or hydride nucleophiles. In addition, we included a description of the isolation and biological activities of the polypropionates and related natural products that have been synthetized using epoxide-based approaches. In conclusion, the epoxide-based methodologies are a non-aldol alternative approach for the construction of polypropionate.
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Affiliation(s)
- Raúl R. Rodríguez-Berríos
- Department of Chemistry, University of Puerto Rico, Rio Piedras Campus, P.O. Box 23346, San Juan 00931-3346, Puerto Rico;
| | - Stephen R. Isbel
- Department of Chemistry & Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, FL 33965, USA
| | - Alejandro Bugarin
- Department of Chemistry & Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, FL 33965, USA
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2
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Tang W, Wang C. Bis-Boric Acid-Mediated Regioselective Reductive Aminolysis of 3,4-Epoxy Alcohols. J Org Chem 2022; 87:15653-15660. [PMID: 36398526 DOI: 10.1021/acs.joc.2c01878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Herein we report a bis-boric acid-mediated regioselective reductive aminolysis of 3,4-epoxy alcohols, providing new access to prepare amino diols in high diastereofidelity directly starting from nitroarenes. Notably, this step-economical process is enabled by the essential dual function of bis-boric acid, which is engaged initially in the 4,4'-bipyridine-catalyzed reduction of nitro compounds as the reductant and subsequently promotes the ring opening reaction of 3,4-epoxy alcohols with the in situ-generated anilines.
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Affiliation(s)
- Wei Tang
- Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Chuan Wang
- Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.,Center for Excellence in Molecular Synthesis of CAS, Hefei, Anhui 230026, P. R. China
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3
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Gündoğdu Ö, Atalay A, Çelebioğlu N, Anıl B, Şahin E, Şanlı-Mohamed G, Bozkaya U, Kara Y. Regio- and stereo-chemical ring-opening reactions of the 2,3-epoxy alcohol derivative with nucleophiles: Explanation of the structures and C-2 selectivity supported by theoretical computations. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Abstract
A new class of highly regio- and stereoselective intramolecular rearrangements of glycidol acetals to produce alkoxylated 1,3-dioxolane/1,3-dioxane is demonstrated. Selective Lewis acid activation of acetal generates an oxocarbenium ion that initiates the epoxide ring-opening event, giving the bicyclic [3,1,0]epoxonium ion intermediate that undergoes exo/endo-selective opening by a tethered alkoxide. Mechanistic insights into preferential acetal activation over the epoxide were obtained by crossover experiments. The method was applied in the total synthesis of parvistone B and its 8-ethoxy analogue.
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Affiliation(s)
- Meera Johny
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, India 695551
| | - Rose Mary Philip
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, India 695551
| | - Goreti Rajendar
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, India 695551
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5
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Affiliation(s)
- Jiawei Liu
- Hefei National Laboratory for Physical Science at the Microscale, Department of Chemistry, Center for Excellence in Molecular Synthesis, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, People’s Republic of China
| | - Chuan Wang
- Hefei National Laboratory for Physical Science at the Microscale, Department of Chemistry, Center for Excellence in Molecular Synthesis, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, People’s Republic of China
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6
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Gembus V, Karmazin L, Uguen D, Zoller T. Formal Synthesis of Borrelidin: A Highly Enantio- and Diastereoselective Access to the Morken’s C2–C12 Intermediate. BCSJ 2019. [DOI: 10.1246/bcsj.20180292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Vincent Gembus
- Laboratoire de Synthèse Organique (associé au CNRS; UMR 7509), Ecole Européenne de Chimie, Polymères et Matériaux, Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - Lydia Karmazin
- Service de Radiocristallographie, Université de Strasbourg, BP296/R8, 67008 Strasbourg, France
| | - Daniel Uguen
- Laboratoire de Synthèse Organique (associé au CNRS; UMR 7509), Ecole Européenne de Chimie, Polymères et Matériaux, Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - Thomas Zoller
- Laboratoire de Synthèse Organique (associé au CNRS; UMR 7509), Ecole Européenne de Chimie, Polymères et Matériaux, Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
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Abstract
In this protocol we described a boronic acid-catalysed C-3 selective ring opening of 3,4-epoxy alcohols with thiophenols and thiols as nucleophiles. This diastereo- and enantiospecific reaction provides an efficient entry to prepare a variety of hydroxyl sulfides. Through the directing effect of the hydroxyl group, nucleophilic attack on the C-3 position of the epoxide moiety is favoured. It can be rationalized in a proposed transition state, in which the boronic acid catalyst tethers both epoxides and S-nucleophiles.
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Affiliation(s)
- Hongqing Yao
- Department of Chemistry, Center for Excellence in Molecular Synthesis, Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 20237, P. R. China.
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8
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Shao XB, Jiang X, Li QH, Zhao ZG. Highly efficient synthesis of 1,2-disubstituted acetylenes derivatives from the cross-coupling reactions of 1-bromoalkynes with organoalane reagents. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.08.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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9
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Affiliation(s)
- Jiawei Liu
- Department of Chemistry, Center for Excellence in Molecular Synthesis, Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 20237, People’s Republic of China
| | - Hongqing Yao
- Department of Chemistry, Center for Excellence in Molecular Synthesis, Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 20237, People’s Republic of China
| | - Chuan Wang
- Department of Chemistry, Center for Excellence in Molecular Synthesis, Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 20237, People’s Republic of China
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Ganganna B, Srihari P, Yadav JS. Studies towards the total synthesis of cruentaren A and B: Stereoselective synthesis of fragments C1-C11, C12-C22 and C23-C28. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.05.034] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
Glycidols prepared via Sharpless asymmetric epoxidation participate in asymmetric redox-neutral carbonyl allylation with good levels of catalyst-directed diastereoselectivity. Equally stereoselective allylations may be performed from the aldehyde oxidation level using 2-propanol as the terminal reductant. An epoxide ring-opening reaction using AlMe3-n-BuLi is used to prepare the propionate-based stereotetrad spanning C17-C23 of dictyostatin, illustrating how this method may be applied to polyketide construction.
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Affiliation(s)
- Seung Wook Kim
- University of Texas at Austin, Department of Chemistry, Austin, TX 78712
| | - Wonchul Lee
- University of Texas at Austin, Department of Chemistry, Austin, TX 78712
| | - Michael J. Krische
- University of Texas at Austin, Department of Chemistry, Austin, TX 78712
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12
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Mo S, Shao XB, Zhang G, Li QH. Highly efficient synthesis of unsymmetrical 1,3-diynes from organoalane reagents and alkynyl bromides mediated by a nickel catalyst. RSC Adv 2017. [DOI: 10.1039/c7ra02758c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Highly efficient and simple cross-coupling reactions of alkynylbromides with organoalane reagents for the synthesis of unsymmetrical 1,3-diynes derivatives using Ni(OAc)2 (2–5 mol%)/(o-furyl)3P (4–10 mol%) as a catalyst are reported.
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Affiliation(s)
- Song Mo
- College of Chemistry and Environmental Protection Engineering
- Southwest University for Nationalities
- Chengdu 610041
- P. R. China
| | - Xue-Bei Shao
- College of Chemistry and Environmental Protection Engineering
- Southwest University for Nationalities
- Chengdu 610041
- P. R. China
| | - Gang Zhang
- College of Chemistry and Environmental Protection Engineering
- Southwest University for Nationalities
- Chengdu 610041
- P. R. China
| | - Qing-Han Li
- College of Chemistry and Environmental Protection Engineering
- Southwest University for Nationalities
- Chengdu 610041
- P. R. China
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Luo L, Yamamoto H. Synthesis of virtually enantiopure aminodiols with three adjacent stereogenic centers by epoxidation and ring-opening. Org Biomol Chem 2015; 13:10466-70. [PMID: 26440919 DOI: 10.1039/c5ob01808k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A virtually complete enantioselective synthesis of 3-amino-1,2-diols with three consecutive stereocenters was accomplished by a sequential cascade of two kinetic resolutions, which features a Sharpless or Hafnium-catalyzed asymmetric epoxidation and a subsequent W-catalyzed aminolysis. Enantiopure products with up to >99.9% ee and >99.9 : 0.1 dr were obtained and could serve as potential building blocks for pharmaceutical or biological significant molecules.
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Affiliation(s)
- Lan Luo
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, USA
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14
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Affiliation(s)
- Chuan Wang
- Department
of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Hisashi Yamamoto
- Department
of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
- Molecular
Catalyst Research Center, Chubu University, 1200 Matsumoto, Kasugai, Aichi 487-8501, Japan
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15
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Wang C, Yamamoto H. Tungsten-catalyzed regio- and enantioselective aminolysis of trans-2,3-epoxy alcohols: an entry to virtually enantiopure amino alcohols. Angew Chem Int Ed Engl 2014; 53:13920-3. [PMID: 25328028 PMCID: PMC4293429 DOI: 10.1002/anie.201408732] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Indexed: 11/06/2022]
Abstract
The first catalytic enantioselective aminolysis of trans-2,3-epoxy alcohols has been accomplished. This stereospecific ring-opening process was efficiently promoted by a tungsten/bis(hydroxamic acid) catalytic system, furnishing various anti-3-amino-1,2-diols with excellent regiocontrol and high enantioselectivities (up to 95% ee). Moreover, virtually enantiopure 3-amino-1,2-diols could be obtained by the sequential combination of two reactions that both involve the use of a chiral catalyst.
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Affiliation(s)
- Chuan Wang
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, IL 60637 (USA)
| | - Hisashi Yamamoto
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, IL 60637 (USA)
- Molecular Catalyst Research Center, Chubu University, 1200 Matsumoto, Kasugai, Aichi 487-8501 (Japan)
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16
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Wang C, Yamamoto H. Tungsten-Catalyzed Regio- and Enantioselective Aminolysis of trans -2,3-Epoxy Alcohols: An Entry to Virtually Enantiopure Amino Alcohols. Angew Chem Int Ed Engl 2014; 126:14140-3. [DOI: 10.1002/ange.201408732] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Abstract
![]()
The
first catalytic, highly C3-selective, stereosepecific ring-opening
reaction of 2,3-epoxy alcohols and 2,3-epoxy sulfonamides has been
accomplished. This process was efficiently promoted by W-salts, and
the developed method was applicable to various epoxides with diverse
N- and O-nucleophiles affording the products in good to excellent
yields (up to 95%) and generally with high regioselectivities (C3:C2
up to >99:1).
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Affiliation(s)
- Chuan Wang
- Department of Chemistry, The University of Chicago , 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
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18
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Prieto JA, Torres JR, Rodríguez-Berrios R. Regiocontrolled ring opening of monoprotected 2,3-epoxy-1,4-diols using alkynyl aluminum reagents. Synthesis of differentially monoprotected alkynyl triol derivatives. Synlett 2014; 25:433-437. [PMID: 27147814 DOI: 10.1055/s-0033-1340332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The regioselectivity of the epoxide ring opening reaction of cis and trans TIPS-monoprotected 2,3-epoxy-1,4-diols with diethylalkynyl aluminum reagents was studied. Alane and alanate conditions in toluene or dichloromethane were explored. The alkynyl attack at the C2 epoxide carbon was favored for both, the alane and alanate conditions in toluene, while in dichloromethane the C3 attack was preferred. The best regioselectivities were obtained using the alanate conditions in toluene. This methodology provides access to differentially monoprotected alkynyl triols with high diastereoselectivity. These compounds are useful building bocks for polypropionate synthesis and are precursors for the introduction of the hydroxymethyl moiety found in some polyketide systems.
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Affiliation(s)
- José A Prieto
- Department of Chemistry, University of Puerto Rico, PO Box 23346, San Juan, PR 00931-3346 Fax:1-787-759-6885
| | - Jaileen Rentas Torres
- Department of Chemistry, University of Puerto Rico, PO Box 23346, San Juan, PR 00931-3346 Fax:1-787-759-6885
| | - Raul Rodríguez-Berrios
- Department of Chemistry, University of Puerto Rico, PO Box 23346, San Juan, PR 00931-3346 Fax:1-787-759-6885
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Kretschmer M, Dieckmann M, Li P, Rudolph S, Herkommer D, Troendlin J, Menche D. Modular Total Synthesis of Rhizopodin: A Highly Potent G-Actin Dimerizing Macrolide. Chemistry 2013; 19:15993-6018. [DOI: 10.1002/chem.201302197] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Indexed: 01/13/2023]
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Mongin F, Harrison-Marchand A. Mixed AggregAte (MAA): A Single Concept for All Dipolar Organometallic Aggregates. 2. Syntheses and Reactivities of Homo/HeteroMAAs. Chem Rev 2013; 113:7563-727. [DOI: 10.1021/cr3002966] [Citation(s) in RCA: 149] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Florence Mongin
- Equipe Chimie et Photonique Moléculaires, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes 1, Bât. 10A, Case 1003, Campus de Beaulieu, Avenue du Général Leclerc, 35042 Rennes Cédex, France
| | - Anne Harrison-Marchand
- Laboratoire COBRA de l′Université de Rouen, INSA de Rouen, CNRS, UMR 6014 & FR 3038, IRCOF, Rue Tesnière, 76821 Mont St Aignan Cédex, France
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Torres G, Ishikawa Y, Prieto JA. Aluminum alkoxide complexes from highly substituted 3,4-epoxy alcohols: An NMR and computational study. J PHYS ORG CHEM 2013. [DOI: 10.1002/poc.3024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Gerardo Torres
- Department of Chemistry; University of Puerto Rico, Río Piedras Campus; San Juan P.R. 00931-3346 USA
| | - Yasuyuki Ishikawa
- Department of Chemistry; University of Puerto Rico, Río Piedras Campus; San Juan P.R. 00931-3346 USA
| | - José A. Prieto
- Department of Chemistry; University of Puerto Rico, Río Piedras Campus; San Juan P.R. 00931-3346 USA
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22
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Righi G, Antonioletti R, Pelagalli R. A highly regioselective azidolysis of 2,3-epoxy amines: an unexpected [Ti(O-i-Pr)2(N3)2] mediated C-2 opening. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.07.074] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Torres W, Torres G, Prieto JA. Synthesis of stereotetrads by regioselective cleavage of diastereomeric MEM-protected 2-methyl-3,4-epoxy alcohols with diethylpropynyl aluminum. Synlett 2012; 23:2534-2538. [PMID: 24163500 DOI: 10.1055/s-0032-1317316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The regioselectivity of the epoxide ring opening of 2-methyl-3,4-epoxy alcohols with diethylpropynylalane has been studied as a function of the C1 alcohol protecting group. An efficient selective method was developed using MEM as the protecting group. The reaction proceeded in a highly regioselective manner providing the useful 1,3-diol motif. The undesired 1,4-diol product produced by some free alcohol diastereomers was not observed. This highly stereoselective method provides access to termini-differentiated stereotetrads, which are essential building bocks for polypropionate synthesis.
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Affiliation(s)
- Wildeliz Torres
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, PO Box 23346, San Juan, P.R. 00932-3346, USA
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24
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Naganawa Y, Maruoka K. Reactions Triggered by Lewis Acidic Organoaluminum Species. In: Woodward S, Dagorne S, editors. Modern Organoaluminum Reagents. Berlin: Springer Berlin Heidelberg; 2013. pp. 187-214. [DOI: 10.1007/3418_2012_37] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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25
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Rodríguez-Berríos RR, Torres G, Prieto JA. Stereoselective VO(acac)(2) Catalyzed Epoxidation of Acyclic Homoallylic Diols. Complementary Preparation of C2-syn-3,4-Epoxy Alcohols. Tetrahedron 2011; 67:830-836. [PMID: 21311601 DOI: 10.1016/j.tet.2010.11.079] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A substrate-controlled stereoselective epoxidation of free and monoprotected homoallylic diols was developed. This second-generation approach is based on the incorporation of a primary hydroxy directing group at the C2 methyl carbon, which changes the nature of the vanadium ester intermediate providing a new diastereoselectivity manifold for the preparation of 3,4-epoxy alcohols. This modification favored the formation of the challenging C2-syn epoxy alcohol product not previously available using the standard homoallylic alcohol substrates. These new epoxy alcohol diastereomers expand the scope and generality for the utilization of 3,4-epoxy alcohols as precursors for stereoselective polypropionate synthesis.
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Affiliation(s)
- Raúl R Rodríguez-Berríos
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, PO Box 70377, San Juan, PR 00931-3346, USA
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Srinivasarao M, Park T, Chen Y, Fuchs PL. Noteworthy observations accompanying synthesis of the apoptolidin disaccharide. Chem Commun (Camb) 2011; 47:5858-60. [DOI: 10.1039/c1cc11448d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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27
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Honjo E, Kutsumura N, Ishikawa Y, Nishiyama S. Synthesis of a spiroacetal moiety of antitumor antibiotic ossamycin by anodic oxidation. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.07.078] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Chowdhury R, Ghosh SK. Sequential Double Olefination of 2-(Arylmethylidene)-2-phosphonoacetonitrile with Dimsyl Lithium and Aldehydes: A Domino Route to Densely Substituted 1,3-Butadienes. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800385] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Fuwa H, Sasaki M. An Efficient Strategy for the Synthesis of Endocyclic Enol Ethers and Its Application to the Synthesis of Spiroacetals. Org Lett 2008; 10:2549-52. [DOI: 10.1021/ol800815t] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Haruhiko Fuwa
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 1-1 Tsutsumidori-amamiya, Aoba-ku, Sendai 981-8555, Japan
| | - Makoto Sasaki
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 1-1 Tsutsumidori-amamiya, Aoba-ku, Sendai 981-8555, Japan
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30
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Chakraborty TK, Samanta R, Ravikumar K. Studies on radical cyclization of 2,3-epoxy alcohols containing a β-(alkoxy)acrylate moiety using Cp2TiCl. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.06.139] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Dávila W, Torres W, Prieto JA. Regioselective Cleavage of 3,4-Epoxy Alcohols with Substituted Alkynylaluminum Reagents: Application to the Stereoselective Synthesis of Polypropionates. Tetrahedron 2007; 63:8218-26. [PMID: 18714333 DOI: 10.1016/j.tet.2007.05.122] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The reaction of 3-O-substituted propynyl aluminum reagents with a TIPS-protected 2,3-epoxy alcohol and several diastereomeric 2-methyl-3,4-epoxy alcohols offers a convenient synthetic approach for the subsequent preparation and epoxidation of allylic alcohols. The yields are low to moderate and the regioselectivity (internal vs external attack) similar to that of the standard diethylpropynyl aluminum reagent. The TMS-acetylide alane reagent gives improved yields and good regioselectivity, and constitutes the reagent of choice for the cleavage of the hindered epoxides. This attractive methodology is applied to the elaboration of two advanced polypropionate precursor fragments.
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Abstract
An efficient systematic approach to the diversity-oriented synthesis of polyketides has been developed to provide both skeletal and stereochemical diversity. Each synthetic intermediate is also a desired polyketide fragment and no protecting group manipulations are required. A first-generation synthesis provides a 74-membered polyketide library comprising six different skeletal classes, each in one to five steps from propargylic alcohol precursors. A study of epoxyol opening reactions revealed unusual reactivity trends based on epoxide configuration.
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Affiliation(s)
- Shiying Shang
- Pharmacology Program, Weill Graduate School of Medical Sciences of Cornell University, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA
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Naka H, Uchiyama M, Matsumoto Y, Wheatley AEH, McPartlin M, Morey JV, Kondo Y. An Aluminum Ate Base: Its Design, Structure, Function, and Reaction Mechanism. J Am Chem Soc 2007; 129:1921-30. [PMID: 17263527 DOI: 10.1021/ja064601n] [Citation(s) in RCA: 177] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An aluminum ate base, i-Bu(3)Al(TMP)Li, has been designed and developed for regio- and chemoselective direct generation of functionalized aromatic aluminum compounds. Direct alumination followed by electrophilic trapping with I(2), Cu/Pd-catalyzed C-C bond formation, or direct oxidation with molecular O(2) proved to be a powerful tool for the preparation of 1,2- or 1,2,3-multisubstituted aromatic compounds. This deprotonative alumination using i-Bu3Al(TMP)Li was found to be effective in aliphatic chemistry as well, enabling regio- and chemoselective addition of functionalized allylic ethers and carbamates to aliphatic and aromatic aldehydes. A combined multinuclear NMR spectroscopy, X-ray crystallography, and theoretical study showed that the aluminum ate base is a Li/Al bimetallic complex bridged by the nitrogen atom of TMP and the alpha-carbon of an i-Bu ligand and that the Li exclusively serves as a recognition point for electronegative functional groups or coordinative solvents. The mechanism of directed ortho alumination reaction of functionalized aromatic compounds has been studied by NMR and in situ FT-IR spectroscopy, X-ray analysis, and DFT calculation. It has been found that the reaction proceeds with facile formation of an initial adduct of the base and aromatic, followed by deprotonative formation of the functionalized aromatic aluminum compound. Deprotonation by the TMP ligand rather than the isobutyl ligand was suggested and reasoned by means of spectroscopic and theoretical study. The remarkable regioselectivity of the ortho alumination reaction was explained by a coordinative approximation effect between the functional groups and the counter Li(+) ion, enabling stable initial complex formation and creation of a less strained transition state structure.
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Affiliation(s)
- Hiroshi Naka
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aobayama, Aoba-ku, Sendai 980-8578, Japan.
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Lewiński J, Horeglad P, Tratkiewicz E, Justyniak I, Ochal Z. Ring-opening of 2,3-epoxy-1-propanol with R3Al: Unprecedented regiochemical switching simply achieved by changing alkyl substituents of aluminium reagent. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2005.03.069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Tirado R, Torres G, Torres W, Prieto JA. Regioselective cleavage of cis- and trans-2-methyl-3,4-epoxy alcohols with diethylpropynyl aluminum. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2004.12.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
A divergent protocol for nucleophilic opening of vinyl epoxides with ethoxyacetylide has been developed and demonstrated to give complete regioselectivity depending on reaction conditions.
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Affiliation(s)
- Per Restorp
- KTH Chemistry, Organic Chemistry, SE-100 44 Stockholm, Sweden
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Sasaki M, Hatta M, Tanino K, Miyashita M. Regio- and stereospecific alkyl and alkynyl substitution reactions of epoxy selenides with organoaluminums via episelenonium ions. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2003.12.137] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tomata Y, Sasaki M, Tanino K, Miyashita M. The first C2 selective halide substitution reaction of 2,3-epoxy alcohols by the use of (CH3O)3B–MX (X=I, Br, Cl) system. Tetrahedron Lett 2003. [DOI: 10.1016/j.tetlet.2003.10.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Chakraborty TK, Purkait S, Das S. Synthesis of chiral 4-hydroxy-2,3-unsaturated carbonyl compounds from 3,4-epoxy alcohols by oxidation: application in the formal synthesis of macrosphelide A. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.09.070] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Shanmugam P, Miyashita M. R3Al-R'3SiOTf: novel and powerful reagent system for stereospecific alkylation-silylation reactions of epoxides. Org Lett 2003; 5:3265-8. [PMID: 12943403 DOI: 10.1021/ol035075x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] A novel and powerful reagent system R(3)Al-R'(3)SiOTf for the one-pot alkylation-silylation reaction of epoxides was discovered, and the reactions of various epoxides with the new reagent system have been demonstrated to occur stereospecifically giving rise to the corresponding alkylation-silylation products in excellent yields.
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Affiliation(s)
- Ponnusamy Shanmugam
- Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
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