1
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Fritsch S, Aldemir N, Balszuweit J, Bojaryn K, Voskuhl J, Hirschhäuser C. Total Synthesis of Resveratrone and iso-Resveratrone. Chemistry 2022; 11:e202200098. [PMID: 35770975 PMCID: PMC9278093 DOI: 10.1002/open.202200098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 05/30/2022] [Indexed: 12/03/2022]
Abstract
The first total synthesis of resveratrone and iso‐resveratrone based on an epoxide olefination approach is described. The pivotal reaction proceeds by insertion of the lithiated epoxide into a boronic ester and subsequent syn‐elimination. Resveratrone has been described to have remarkable photophysical properties, including two‐photon absorption. Therefore, an azide derivative has been prepared to allow for use as a biological label.
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Affiliation(s)
- Stefan Fritsch
- Organic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitätsstr. 5-7, 45117, Essen, Germany
| | - Nazli Aldemir
- Organic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitätsstr. 5-7, 45117, Essen, Germany
| | - Jan Balszuweit
- Organic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitätsstr. 5-7, 45117, Essen, Germany
| | - Kevin Bojaryn
- Organic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitätsstr. 5-7, 45117, Essen, Germany
| | - Jens Voskuhl
- Organic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitätsstr. 5-7, 45117, Essen, Germany
| | - Christoph Hirschhäuser
- Organic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitätsstr. 5-7, 45117, Essen, Germany
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2
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Bojaryn K, Hirschhäuser C. Transition Metal Catalyst Free Synthesis of Olefins from Organoboron Derivatives. Chemistry 2022; 28:e202104125. [PMID: 35137987 PMCID: PMC9303902 DOI: 10.1002/chem.202104125] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Indexed: 11/29/2022]
Abstract
Stereoselective preparation of highly substituted olefins is still a severe challenge that requires well defined elimination precursors. Organoboron chemistry is particularly suited for the preparation of molecules with adjacent stereocenters. As organo boron substrates with leaving groups in β-position can undergo stereospecific syn- or anti-elimination, this chemistry harbors great potential for the synthesis of complex olefins. In recent years three main strategies emerged, which differ in their approach to the β-functionalized organoboron elimination precursor. (i) Stereoselective preparation of such elimination precursor can be achieved by addition of a boron-stabilized anion (d1 ) to an aldehyde or ketone (a1 ) or diastereoselective 1,3-rearrangement of suitable boron-ate-complexes. Stereospecific methods rely either on (ii) diastereospecific 1,2-metalate rearrangement of boron-ate-complexes that involve opening of appropriate heterocycles or (iii) addition of chiral carbenoids (d1 *) to chiral boronates (a1 *) with a leaving group in α-position.
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Affiliation(s)
- K. Bojaryn
- Institut für Organische ChemieUniversität Duisburg-EssenUniversitätsstraße 745141EssenGermany
| | - C. Hirschhäuser
- Institut für Organische ChemieUniversität Duisburg-EssenUniversitätsstraße 745141EssenGermany
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3
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Ma X, Kuang Z, Song Q. Recent Advances in the Construction of Fluorinated Organoboron Compounds. JACS AU 2022; 2:261-279. [PMID: 35252978 PMCID: PMC8889561 DOI: 10.1021/jacsau.1c00129] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Indexed: 05/05/2023]
Abstract
Fluorinated organoboron compounds are important synthetic building blocks that combine the unique characteristics of a fluorinated motif with the versatile synthetic applications of organoboron moiety. This review article guides the research on fluorinated organoboron compounds mainly from four aspects in recent years: selective monodefluoroborylation of polyfluoroarenes and polyfluoroalkenes, selective borylation of fluorinated substrates, selective fluorination of organoboron compounds, and borofluorination of alkynes/olefins. In addition, this review will provide a necessary guidance and inspiration for the research on the valuable synthetic building block fluorinated organoboron compounds.
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Affiliation(s)
- Xingxing Ma
- Key
Laboratory of Molecule Synthesis and Function Discovery, Fujian Province
University, College of Chemistry at Fuzhou
University, Fuzhou, Fujian 350108, China
| | - Zhijie Kuang
- Institute
of Next Generation Matter Transformation, College of Materials Science
Engineering & Chemical Engineering, Huaqiao University, 668 Jimei Boulevard, Xiamen, Fujian 361021, China
| | - Qiuling Song
- Key
Laboratory of Molecule Synthesis and Function Discovery, Fujian Province
University, College of Chemistry at Fuzhou
University, Fuzhou, Fujian 350108, China
- Institute
of Next Generation Matter Transformation, College of Materials Science
Engineering & Chemical Engineering, Huaqiao University, 668 Jimei Boulevard, Xiamen, Fujian 361021, China
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4
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Volochnyuk DM, Gorlova AO, Grygorenko OO. Saturated Boronic Acids, Boronates, and Trifluoroborates: An Update on Their Synthetic and Medicinal Chemistry. Chemistry 2021; 27:15277-15326. [PMID: 34499378 DOI: 10.1002/chem.202102108] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Indexed: 12/13/2022]
Abstract
This review discusses recent advances in the chemistry of saturated boronic acids, boronates, and trifluoroborates. Applications of the title compounds in the design of boron-containing drugs are surveyed, with special emphasis on α-amino boronic derivatives. A general overview of saturated boronic compounds as modern tools to construct C(sp3 )-C and C(sp3 )-heteroatom bonds is given, including recent developments in the Suzuki-Miyaura and Chan-Lam cross-couplings, single-electron-transfer processes including metallo- and organocatalytic photoredox reactions, and transformations of boron "ate" complexes. Finally, an attempt to summarize the current state of the art in the synthesis of saturated boronic acids, boronates, and trifluoroborates is made, with a brief mention of the "classical" methods (transmetallation of organolithium/magnesium reagents with boron species, anti-Markovnikov hydroboration of alkenes, and the modification of alkenyl boron compounds) and a special focus on recent methodologies (boronation of alkyl (pseudo)halides, derivatives of carboxylic acids, alcohols, and primary amines, boronative C-H activation, novel approaches to alkene hydroboration, and 1,2-metallate-type rearrangements).
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Affiliation(s)
- Dmitriy M Volochnyuk
- Enamine Ltd. (www.enamine.net), Chervonotkatska 78, Kyiv, 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv, 01601, Ukraine.,Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska Street 5, Kyiv, 02094, Ukraine
| | - Alina O Gorlova
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska Street 5, Kyiv, 02094, Ukraine
| | - Oleksandr O Grygorenko
- Enamine Ltd. (www.enamine.net), Chervonotkatska 78, Kyiv, 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv, 01601, Ukraine
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5
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Pineschi M. Boron Reagents and Catalysts for the Functionalization of Strained Heterocycles. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001493] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Mauro Pineschi
- Department of Pharmacy University of Pisa Via Bonanno 33 56126 Pisa Italy Tel
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6
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Bennett SH, Fawcett A, Denton EH, Biberger T, Fasano V, Winter N, Aggarwal VK. Difunctionalization of C-C σ-Bonds Enabled by the Reaction of Bicyclo[1.1.0]butyl Boronate Complexes with Electrophiles: Reaction Development, Scope, and Stereochemical Origins. J Am Chem Soc 2020; 142:16766-16775. [PMID: 32885974 DOI: 10.1021/jacs.0c07357] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Difunctionalization reactions of C-C σ-bonds have the potential to streamline access to molecules that would otherwise be difficult to prepare. However, the development of such reactions is challenging because C-C σ-bonds are typically unreactive. Exploiting the high ring-strain energy of polycyclic carbocycles is a common strategy to weaken and facilitate the reaction of C-C σ-bonds, but there are limited examples of highly strained C-C σ-bonds being used in difunctionalization reactions. We demonstrate that highly strained bicyclo[1.1.0]butyl boronate complexes (strain energy ca. 65 kcal/mol), which were prepared by reacting boronic esters with bicyclo[1.1.0]butyl lithium, react with electrophiles to achieve the diastereoselective difunctionalization of the strained central C-C σ-bond of the bicyclo[1.1.0]butyl unit. The reaction shows broad substrate scope, with a range of different electrophiles and boronic esters being successfully employed to form a diverse set of 1,1,3-trisubstituted cyclobutanes (>50 examples) with high diastereoselectivity. The high diastereoselectivity observed has been rationalized based on a combination of experimental data and DFT calculations, which suggests that separate concerted and stepwise reaction mechanisms are operating, depending upon the migrating substituent and electrophile used.
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Affiliation(s)
- Steven H Bennett
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Alexander Fawcett
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Elliott H Denton
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Tobias Biberger
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Valerio Fasano
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Nils Winter
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Varinder K Aggarwal
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
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7
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Nandakumar M, Rubial B, Noble A, Myers EL, Aggarwal VK. Ring-Opening Lithiation-Borylation of 2-Trifluoromethyl Oxirane: A Route to Versatile Tertiary Trifluoromethyl Boronic Esters. Angew Chem Int Ed Engl 2020; 59:1187-1191. [PMID: 31710748 DOI: 10.1002/anie.201912797] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Indexed: 11/07/2022]
Abstract
Stereogenic trifluoromethyl-substituted carbon centers are highly sought-after moieties in pharmaceutical and agrochemical discovery. Here, we show that lithiation-borylation reactions of 2-trifluoromethyl oxirane give densely functionalized and highly versatile trifluoromethyl-substituted α-tertiary boronic esters. The intermediate boronate complexes undergo the desired 1,2-rearrangement of the carbon-based group with complete retentive stereospecificity, a process that was only observed in non-polar solvents in the presence of TESOTf. Although the trifluoromethyl group adversely affects subsequent transformations of the α-boryl group, Zweifel olefinations provide trifluoromethyl-bearing quaternary stereocenters substituted with alkenes, alkynes and ketones.
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Affiliation(s)
| | - Belén Rubial
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Adam Noble
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Eddie L Myers
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Varinder K Aggarwal
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
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8
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Das KK, Paul S, Panda S. Transition metal-free synthesis of alkyl pinacol boronates. Org Biomol Chem 2020; 18:8939-8974. [DOI: 10.1039/d0ob01721c] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
This review systematically outlined the research in the area of transition metal free synthesis of alkyl pinacol boronates, which are versatile and important scaffolds to construct diverse organic compounds.
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Affiliation(s)
- Kanak Kanti Das
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
| | - Swagata Paul
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
| | - Santanu Panda
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
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9
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Nandakumar M, Rubial B, Noble A, Myers EL, Aggarwal VK. Ring‐Opening Lithiation–Borylation of 2‐Trifluoromethyl Oxirane: A Route to Versatile Tertiary Trifluoromethyl Boronic Esters. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201912797] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
| | - Belén Rubial
- School of Chemistry University of Bristol, Cantock's Close Bristol BS8 1TS UK
| | - Adam Noble
- School of Chemistry University of Bristol, Cantock's Close Bristol BS8 1TS UK
| | - Eddie L. Myers
- School of Chemistry University of Bristol, Cantock's Close Bristol BS8 1TS UK
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10
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Fordham JM, Grayson MN, Aggarwal VK. Vinylidene Homologation of Boronic Esters and its Application to the Synthesis of the Proposed Structure of Machillene. Angew Chem Int Ed Engl 2019; 58:15268-15272. [PMID: 31365776 DOI: 10.1002/anie.201907617] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 07/30/2019] [Indexed: 01/20/2023]
Abstract
Alkenyl boronic esters are important reagents in organic synthesis. Herein, we report that these valuable products can be accessed by the homologation of boronic esters with lithiated epoxysilanes. Aliphatic and electron-rich aromatic boronic esters provided vinylidene boronic esters in moderate to high yields, while electron-deficient aromatic and vinyl boronic esters were found to give the corresponding vinyl silane products. Through DFT calculations, this divergence in mechanistic pathway has been rationalized by considering the stabilization of negative charge in the C-Si and C-B bond breaking transition states. This vinylidene homologation was used in a short six-step stereoselective synthesis of the proposed structure of machillene, however, synthetic and reported data were found to be inconsistent.
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Affiliation(s)
- James M Fordham
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Matthew N Grayson
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Varinder K Aggarwal
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
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11
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Fordham JM, Grayson MN, Aggarwal VK. Vinylidene Homologation of Boronic Esters and its Application to the Synthesis of the Proposed Structure of Machillene. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907617] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- James M. Fordham
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Matthew N. Grayson
- Department of Chemistry University of Bath Claverton Down Bath BA2 7AY UK
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12
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Sun Y, Zhou Y, Shi Y, Del Pozo J, Torker S, Hoveyda AH. Copper-Hydride-Catalyzed Enantioselective Processes with Allenyl Boronates. Mechanistic Nuances, Scope, and Utility in Target-Oriented Synthesis. J Am Chem Soc 2019; 141:12087-12099. [PMID: 31314510 DOI: 10.1021/jacs.9b05465] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Synthesis of complex bioactive molecules is substantially facilitated by transformations that efficiently and stereoselectively generate polyfunctional compounds. Designing such processes is hardly straightforward, however, especially when the desired route runs counter to the inherently favored reactivity profiles. Furthermore, in addition to being efficient and stereoselective, it is crucial that the products generated can be easily and stereodivergently modified. Here, we introduce a catalytic process that delivers versatile and otherwise difficult-to-access organoboron entities by combining an allenylboronate, a hydride, and an allylic phosphate. Two unique selectivity problems had to be solved: avoiding rapid side reaction of a Cu-H complex with an allylic phosphate, while promoting its addition to an allenylboronate as opposed to the commonly utilized boron-copper exchange. The utility of the approach is demonstrated by applications to concise preparation of the linear fragment of pumiliotoxin B (myotonic, cardiotonic) and enantioselective synthesis and structure confirmation of netamine C, a member of a family of anti-tumor and anti-malarial natural products. Completion of the latter routes required the following noteworthy developments: (1) a two-step all-catalytic sequence for conversion of a terminal alkene to a monosubstituted alkyne; (2) a catalytic SN2'- and enantioselective allylic substitution method involving a mild alkylzinc halide reagent; and (3) a diastereoselective [3+2]-cycloaddition to assemble the polycyclic structure of a guanidyl polycyclic natural product.
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Affiliation(s)
- Yu Sun
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - Yuebiao Zhou
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - Ying Shi
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - Juan Del Pozo
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - Sebastian Torker
- Supramolecular Science and Engineering Institute , University of Strasbourg , CNRS, 67000 Strasbourg , France
| | - Amir H Hoveyda
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States.,Supramolecular Science and Engineering Institute , University of Strasbourg , CNRS, 67000 Strasbourg , France
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13
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Gava R, Fernández E. Organoboron synthesis via ring opening coupling reactions. Org Biomol Chem 2019; 17:6317-6325. [PMID: 31180097 DOI: 10.1039/c9ob00989b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One of the most atom economical synthesis reactions of organoboron compounds can be achieved by addition reactions of boron reagents to unsaturated substrates. However, when the addition reaction takes place via carbanions promoting ring opening coupling reactions, the selective cleavage of the inherent bonds and the generation of new C-C bonds warrant the selective synthesis of organoboron systems with total efficiency. Here we describe new trends towards the selective synthesis of organoboron compounds where boron reagents and cyclic substrates participate in the generation of carbanions, in the presence of stoichiometric amounts of main-group metals or catalytic amounts of transition metal complexes, via ring opening coupling transformations. The generality and limitations of these new protocols are discussed.
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Affiliation(s)
- Riccardo Gava
- Department of Química Física i Inorgànica, University Rovira i Virgili, Tarragona, Spain.
| | - Elena Fernández
- Department of Química Física i Inorgànica, University Rovira i Virgili, Tarragona, Spain.
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14
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Fuentespina RP, Garcia de la Cruz JA, Durin G, Mamane V, Weibel JM, Pale P. Borylation and rearrangement of alkynyloxiranes: a stereospecific route to substituted α-enynes. Beilstein J Org Chem 2019; 15:1416-1424. [PMID: 31293691 PMCID: PMC6604752 DOI: 10.3762/bjoc.15.141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 06/07/2019] [Indexed: 12/05/2022] Open
Abstract
1,3-Enynes are important building blocks in organic synthesis and also constitute the key motif in various bioactive natural products and functional materials. However, synthetic approaches to stereodefined substituted 1,3-enynes remain a challenge, as they are limited to Wittig and cross-coupling reactions. Herein, stereodefined 1,3-enynes, including tetrasubstituted ones, were straightforwardly synthesized from cis or trans-alkynylated oxiranes in good to excellent yields by a one-pot cascade process. The procedure relies on oxirane deprotonation, borylation and a stereospecific rearrangement of the so-formed alkynyloxiranyl borates. This stereospecific process overall transfers the cis or trans-stereochemistry of the starting alkynyloxiranes to the resulting 1,3-enynes.
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Affiliation(s)
- Ruben Pomar Fuentespina
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - José Angel Garcia de la Cruz
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - Gabriel Durin
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - Victor Mamane
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - Jean-Marc Weibel
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - Patrick Pale
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
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15
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Gregson CHU, Ganesh V, Aggarwal VK. Strain Release of Donor–Acceptor Cyclopropyl Boronate Complexes. Org Lett 2019; 21:3412-3416. [DOI: 10.1021/acs.orglett.9b01152] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Venkataraman Ganesh
- School of Chemistry, University of Bristol, Cantock’s
Close, Bristol BS8 1TS, U.K
| | - Varinder K. Aggarwal
- School of Chemistry, University of Bristol, Cantock’s
Close, Bristol BS8 1TS, U.K
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16
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Bojaryn K, Fritsch S, Hirschhäuser C. Iterative Synthesis of Alkenes by Insertion of Lithiated Epoxides into Boronic Esters. Org Lett 2019; 21:2218-2222. [PMID: 30888189 DOI: 10.1021/acs.orglett.9b00517] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The insertion of lithiated epoxides into boronic esters followed by thermal syn-elimination provides a stereospecific entry to alkenes. This process avoids transition metals and is amenable to iteration to provide higher substitution patterns.
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Affiliation(s)
- Kevin Bojaryn
- Institut für Organische Chemie , Universität Duisburg-Essen , Universitätsstraße 7 , 45141 Essen , Germany
| | - Stefan Fritsch
- Institut für Organische Chemie , Universität Duisburg-Essen , Universitätsstraße 7 , 45141 Essen , Germany
| | - Christoph Hirschhäuser
- Institut für Organische Chemie , Universität Duisburg-Essen , Universitätsstraße 7 , 45141 Essen , Germany
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17
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Fawcett A, Murtaza A, Gregson CHU, Aggarwal VK. Strain-Release-Driven Homologation of Boronic Esters: Application to the Modular Synthesis of Azetidines. J Am Chem Soc 2019; 141:4573-4578. [DOI: 10.1021/jacs.9b01513] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Alexander Fawcett
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Amna Murtaza
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Charlotte H. U. Gregson
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Varinder K. Aggarwal
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
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18
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Myhill JA, Zhang L, Lovinger GJ, Morken JP. Enantioselective Construction of Tertiary Boronic Esters by Conjunctive Cross-Coupling. Angew Chem Int Ed Engl 2018; 57:12799-12803. [PMID: 30091829 PMCID: PMC6414220 DOI: 10.1002/anie.201807775] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Indexed: 12/24/2022]
Abstract
Catalytic enantioselective conjunctive cross-coupling has been developed to construct tertiary alkylboronic esters. These reactions occur with good yield and enantioselectivity for a range of substrates. Mechanistic experiments reveal aspects of the catalytic cycle that allow hindered substrates to react without significant complicating side reactions.
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Affiliation(s)
- Jesse A Myhill
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - Liang Zhang
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - Gabriel J Lovinger
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - James P Morken
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
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19
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Myhill JA, Zhang L, Lovinger GJ, Morken JP. Enantioselective Construction of Tertiary Boronic Esters by Conjunctive Cross-Coupling. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201807775] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Jesse A. Myhill
- Department of Chemistry; Boston College; 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Liang Zhang
- Department of Chemistry; Boston College; 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Gabriel J. Lovinger
- Department of Chemistry; Boston College; 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - James P. Morken
- Department of Chemistry; Boston College; 2609 Beacon Street Chestnut Hill MA 02467 USA
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20
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Millán A, Grigol Martinez PD, Aggarwal VK. Stereocontrolled Synthesis of Polypropionate Fragments based on a Building Block Assembly Strategy using Lithiation-Borylation Methodologies. Chemistry 2017; 24:730-735. [DOI: 10.1002/chem.201704946] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Indexed: 12/14/2022]
Affiliation(s)
- Alba Millán
- School of Chemistry; University of Bristol, Cantock's Close; Bristol BS8 1TS UK
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21
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Iterative assembly line synthesis of polypropionates with full stereocontrol. Nat Chem 2017; 9:896-902. [DOI: 10.1038/nchem.2757] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 02/27/2017] [Indexed: 12/23/2022]
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22
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Fawcett A, Nitsch D, Ali M, Bateman JM, Myers EL, Aggarwal VK. Regio- and Stereoselective Homologation of 1,2-Bis(Boronic Esters): Stereocontrolled Synthesis of 1,3-Diols and Sch 725674. Angew Chem Int Ed Engl 2016; 55:14663-14667. [PMID: 27781356 PMCID: PMC5129522 DOI: 10.1002/anie.201608406] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2016] [Indexed: 01/17/2023]
Abstract
1,2-Bis(boronic esters), derived from the enantioselective diboration of terminal alkenes, can be selectively homologated at the primary boronic ester by using enantioenriched primary/secondary lithiated carbamates or benzoates to give 1,3-bis(boronic esters), which can be subsequently oxidized to the corresponding secondary-secondary and secondary-tertiary 1,3-diols with full stereocontrol. The transformation was applied to a concise total synthesis of the 14-membered macrolactone, Sch 725674. The nine-step synthetic route also features a novel desymmetrizing enantioselective diboration of a divinyl carbinol derivative and high-yielding late-stage cross-metathesis and Yamaguchi macrolactonization reactions.
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Affiliation(s)
- Alexander Fawcett
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - Dominik Nitsch
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - Muhammad Ali
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
- Department of ChemistryCOMSATS Institute of Information TechnologyUniversity RoadAbbottabad-22060, KPKPakistan
| | - Joseph M. Bateman
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - Eddie L. Myers
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
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23
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Fawcett A, Nitsch D, Ali M, Bateman JM, Myers EL, Aggarwal VK. Regio- and Stereoselective Homologation of 1,2-Bis(Boronic Esters): Stereocontrolled Synthesis of 1,3-Diols and Sch 725674. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608406] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Alexander Fawcett
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - Dominik Nitsch
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - Muhammad Ali
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
- Department of Chemistry; COMSATS Institute of Information Technology; University Road Abbottabad- 22060, KPK Pakistan
| | - Joseph M. Bateman
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - Eddie L. Myers
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
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24
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Grisin A, Oliver S, Ganton MD, Bacsa J, Evans PA. Diastereoselective construction of anti-4,5-disubstituted-1,3-dioxolanes via a bismuth-mediated two-component hemiacetal oxa-conjugate addition of γ-hydroxy-α,β-unsaturated ketones with paraformaldehyde. Chem Commun (Camb) 2016; 51:15681-4. [PMID: 26365112 DOI: 10.1039/c5cc01949d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The bismuth-mediated two-component hemiacetal oxa-conjugate addition of γ-hydroxy-α,β-unsaturated ketones with paraformaldehyde affords anti-4,5-disubstituted-1,3-dioxolanes in an efficient and stereoselective manner. The reaction provides a practical, inexpensive and atom-economical approach to these types of heterocycles, which represent useful intermediates for target-directed synthesis and precursors to syn-1,2-diols.
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Affiliation(s)
- Aleksandr Grisin
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada.
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25
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26
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27
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Gamedze MP, Nkambule CM. Dibutyltin oxide mediated diastereoselective cyclodehydration/sulfonylation of 1,2,4-triols. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.02.083] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Eppe G, Didier D, Marek I. Stereocontrolled Formation of Several Carbon–Carbon Bonds in Acyclic Systems. Chem Rev 2015; 115:9175-206. [DOI: 10.1021/cr500715t] [Citation(s) in RCA: 105] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Guillaume Eppe
- 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
| | - Dorian Didier
- 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
| | - 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
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29
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Moriya K, Didier D, Simon M, Hammann JM, Berionni G, Karaghiosoff K, Zipse H, Mayr H, Knochel P. Stereoselective Synthesis and Reactions of Secondary Alkyllithium Reagents Functionalized at the 3-Position. Angew Chem Int Ed Engl 2015; 54:2754-7. [DOI: 10.1002/anie.201409165] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 11/07/2014] [Indexed: 11/08/2022]
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30
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Moriya K, Didier D, Simon M, Hammann JM, Berionni G, Karaghiosoff K, Zipse H, Mayr H, Knochel P. Stereoselektive Synthese und Reaktionen von in Position 3 funktionalisierten sekundären Alkyllithiumverbindungen. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201409165] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Barsamian AL, Wu Z, Blakemore PR. Enantioselective synthesis of α-phenyl- and α-(dimethylphenylsilyl)alkylboronic esters by ligand mediated stereoinductive reagent-controlled homologation using configurationally labile carbenoids. Org Biomol Chem 2015; 13:3781-6. [DOI: 10.1039/c5ob00159e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Enantioselective chain extension of boronic esters with configurationally labile racemic carbenoids is achieved in the presence of scalemic bisoxazoline ligands.
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Affiliation(s)
| | - Zhenhua Wu
- Department of Chemistry
- Oregon State University
- Corvallis
- USA
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32
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Alwedi E, Zakharov LN, Blakemore PR. Chain Extension of Boronic Esters with Lithiooxiranes Generated by Sulfoxide-Metal Exchange - Stereocontrolled Access to 2°/2°, 2°/3°, and 3°/3° Vicinal Diols and Related Compounds. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403105] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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33
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Capriati V, Florio S, Luisi R. Complexation Phenomena and Dynamics at Work in the Lithiation Reactions of Small-Ring Heterocycles: Regio- and Stereoselectivity. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402744] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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34
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Zhang H, Feng D, Sheng H, Ma X, Wan J, Tang Q. Asymmetric transfer hydrogenation of unsymmetrical benzils. RSC Adv 2014. [DOI: 10.1039/c3ra47129b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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35
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Emerson CR, Zakharov LN, Blakemore PR. Investigation of functionalized α-chloroalkyllithiums for a stereospecific reagent-controlled homologation approach to the analgesic alkaloid (-)-epibatidine. Chemistry 2013; 19:16342-56. [PMID: 24127119 DOI: 10.1002/chem.201302511] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Indexed: 11/10/2022]
Abstract
Four putative functionalized α-chloroakyllithiums RCH2CHLiCl, where R=CHCH2(18 a), CCH (18 b), CH2OBn (18 c), and CH[O(CH2)2O] (18 d), were generated in situ by sulfoxide-lithium exchange from α-chlorosulfoxides, and investigated for the stereospecific reagent-controlled homologation (StReCH) of phenethyl and 2-chloropyrid-5-yl (17) pinacol boronic esters. Deuterium labeling experiments revealed that α-chloroalkyllithiums are quenched by proton transfer from their α-chlorosulfoxide precursors and it was established that this effect compromises the yield of StReCH reactions. Use of α-deuterated α-chlorosulfoxides was discovered to ameliorate the problem by retarding the rate of acid-base chemistry between the carbenoid and its precursor. Carbenoids 18 a and 18 b showed poor StReCH efficacy, particularly the propargyl group bearing carbenoid 18 b, the instability of which was attributed to a facile 1,2-hydride shift. By contrast, 18 d, a carbenoid that benefits from a stabilizing interaction between O and Li atoms gave good StReCH yields. Boronate 17 was chain extended by carbenoids 18 a, 18 b, and 18 d in 16, 0, and 68% yield, respectively; α-deuterated isotopomers D-18 a and D-18 d gave yields of 33 and 79% for the same reaction. Double StReCH of 17 was pursued to target contiguous stereodiads appropriate for the total synthesis of (-)-epibatidine (15). One-pot double StReCH of boronate 17 by two exposures to (S)-D-18 a (≤66 % ee), followed by work-up with KOOH, gave the expected stereodiad product in 16% yield (d.r.~67:33). The comparable reaction using two exposures to (S)-D-18 d (≤90% ee) delivered the expected bisacetal containing stereodiad (R,R)-DD-48 in 40% yield (≥98% ee, d.r.=85:15). Double StReCH of 17 using (S)-D-18 d (≤90% ee) followed by (R)-D-18 d (≤90% ee) likewise gave (R,S)-DD-48 in 49% yield (≥97% ee, d.r.=79:21). (R,S)-DD-48 was converted to a dideuterated isotopomer of a synthetic intermediate in Corey's synthesis of 15.
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36
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Sun X, Blakemore PR. Programmed synthesis of a contiguous stereotriad motif by triple stereospecific reagent-controlled homologation. Org Lett 2013; 15:4500-3. [PMID: 23947788 DOI: 10.1021/ol402049y] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
All distinct diastereoisomers of a contiguous stereotriad motif were separately targeted by a triple chain extension of B-phenethyl boronic esters using four unique presentation sequences of enantiomorphs of 1-[(2)H]-1-chloro-2-(1,3-dioxolan-2-yl)ethyllithium. The (R)- or (S)-configured chloroalkyllithium reagents were generated by sulfoxide-lithium exchange from the appropriate scalemic p-tolyl chloroalkyl sulfoxides using phenyllithium (THF, -78 °C). Stereotriad synthesis was accomplished in a single reaction vessel [7-19% yield, typical dr ≥ 74 (target):26 (∑ all other isomers)] and implemented by a simple algorithm consisting of reagent charging and temperature cycling events.
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Affiliation(s)
- Xun Sun
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003, USA
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37
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Rayner PJ, O'Brien P, Horan RAJ. Preparation and reactions of enantiomerically pure α-functionalized Grignard reagents. J Am Chem Soc 2013; 135:8071-7. [PMID: 23647498 DOI: 10.1021/ja4033956] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A strategy for the generation of enantiomerically pure α-functionalized chiral Grignard reagents is presented. The approach involves the synthesis of α-alkoxy and α-amino sulfoxides in ≥99:1 dr and ≥99:1 er via asymmetric deprotonation (s-BuLi/chiral diamine) and trapping with Andersen's sulfinate (menthol derived). Subsequent sulfoxide → Mg exchange (room temperature, 1 min) and electrophilic trapping delivers a range of enantiomerically pure α-alkoxy and α-amino substituted products. Using this approach, either enantiomer of products can be accessed in 99:1 er from asymmetric deprotonation protocols without the use of (-)-sparteine as the chiral ligand. Two additional discoveries are noteworthy: (i) for the deprotonation and trapping with Andersen's sulfinate, there is a lack of stereospecificity at sulfur due to attack of a lithiated intermediate onto the α-alkoxy and α-amino sulfoxides as they form, and (ii) the α-alkoxy-substituted Grignard reagent is configurationally stable at room temperature for 30 min.
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Affiliation(s)
- Peter J Rayner
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
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38
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Kim D, Lee JS, Kong SB, Han H. Cross-Metathesis/Iridium(I)-catalyzed Allylic Etherification Strategy: (Iterative) Catalytic Asymmetric Synthesis ofsyn-andanti-1,2-Diols. Angew Chem Int Ed Engl 2013; 52:4203-6. [DOI: 10.1002/anie.201209112] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Indexed: 11/06/2022]
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39
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Kim D, Lee JS, Kong SB, Han H. Cross-Metathesis/Iridium(I)-catalyzed Allylic Etherification Strategy: (Iterative) Catalytic Asymmetric Synthesis ofsyn-andanti-1,2-Diols. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209112] [Citation(s) in RCA: 7] [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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40
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Hussain N, Hussain MM, Carroll PJ, Walsh PJ. Chemo- and diastereoselective tandem dual oxidation of B(pin)-substituted allylic alcohols: synthesis of B(pin)-substituted epoxy alcohols, 2-keto-anti-1,3-diols and dihydroxy-tetrahydrofuran-3-ones. Chem Sci 2013. [DOI: 10.1039/c3sc51616d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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41
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Pulis AP, Aggarwal VK. Synthesis of Enantioenriched Tertiary Boronic Esters from Secondary Allylic Carbamates. Application to the Synthesis of C30 Botryococcene. J Am Chem Soc 2012; 134:7570-4. [DOI: 10.1021/ja303022d] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alexander P. Pulis
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol,
BS8 1TS, United Kingdom
| | - Varinder K. Aggarwal
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol,
BS8 1TS, United Kingdom
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42
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Park JK, McQuade DT. Iterative Asymmetric Allylic Substitutions: syn- and anti-1,2-Diols through Catalyst Control. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201107874] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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43
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Park JK, McQuade DT. Iterative Asymmetric Allylic Substitutions: syn- and anti-1,2-Diols through Catalyst Control. Angew Chem Int Ed Engl 2012; 51:2717-21. [DOI: 10.1002/anie.201107874] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Indexed: 02/04/2023]
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44
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Barsamian AL, Blakemore PR. Stereocontrolled Generation of α-Metalated S,O-Acetals by Sulfoxide-Ligand Exchange from Cyclic Dithioorthoformate Monooxides. Organometallics 2011. [DOI: 10.1021/om200858v] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Adam L. Barsamian
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003,
United States
| | - Paul R. Blakemore
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003,
United States
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45
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Hussain MM, Hernández Toribio J, Carroll PJ, Walsh PJ. Synthesis of 2-Keto-anti-1,3-diols by Chemoselective Tandem Oxidation of 2-B(pin)-Substituted Allylic Alcohols. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201005742] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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46
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Hussain MM, Hernández Toribio J, Carroll PJ, Walsh PJ. Synthesis of 2-Keto-anti-1,3-diols by Chemoselective Tandem Oxidation of 2-B(pin)-Substituted Allylic Alcohols. Angew Chem Int Ed Engl 2011; 50:6337-40. [DOI: 10.1002/anie.201005742] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2010] [Revised: 03/15/2011] [Indexed: 11/06/2022]
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47
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Emerson CR, Zakharov LN, Blakemore PR. Iterative stereospecific reagent-controlled homologation using a functionalized α-chloroalkyllithium: synthesis of cyclic targets related to epibatidine. Org Lett 2011; 13:1318-21. [PMID: 21338072 DOI: 10.1021/ol103170y] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Enantioenriched 1-chloro-2-(1,3-dioxolan-2-yl)ethyllithium was generated by PhLi initiated sulfoxide-ligand exchange and deployed in situ for sequential double stereospecific reagent-controlled homologation (StReCH) of B-(2-chloro-pyrid-5-yl) pinacol boronate. This process afforded highly functionalized contiguous stereodiad motifs (typically, % ee ≥ 98%, dr ≥ 85:15) amenable to subsequent annulative transformations as demonstrated by the concise synthesis (5-7 steps) of cyclic adducts related to the analgesic alkaloid epibatidine.
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Affiliation(s)
- Christopher R Emerson
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003, United States
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48
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Endo K, Hirokami M, Shibata T. Stereoselective synthesis of tetrasubstituted alkenylboronates via 1,1-organodiboronates. J Org Chem 2010; 75:3469-72. [PMID: 20394374 DOI: 10.1021/jo1003407] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The stereoselective synthesis of tetrasubstituted alkenylboronates was established via the lithiation/nucleophilic addition reaction of 1,1-organodiboronates to carbonyl compounds. The present approach enables the facile and practical synthesis of tetrasubstituted olefins, which are useful synthetic intermediates for further functionalizations.
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Affiliation(s)
- Kohei Endo
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan.
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49
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Capriati V, Florio S, Perna F, Salomone A. Lithiated Fluorinated Styrene Oxides: Configurational Stability, Synthetic Applications, and Mechanistic Insight. Chemistry 2010; 16:9778-88. [DOI: 10.1002/chem.201000897] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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50
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Capriati V, Florio S. Anatomy of long-lasting love affairs with lithium carbenoids: past and present status and future prospects. Chemistry 2010; 16:4152-62. [PMID: 20222089 DOI: 10.1002/chem.200902870] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
After a long adolescence, the chemistry of lithium carbenoids has currently been entering its maturity bringing a dowry of a more in-depth and less empirical knowledge of the structure and configurational stability of such double-faced intermediates; this, thanks in particular to the synergistic and harmonic cooperation between calculations and the most modern NMR techniques now at our disposal. Such knowledge has stimulated the development of fruitful stereoselective applications in the field of organic synthesis, providing in addition a rationale to observed selectivities. Such aspects together with the role played by aggregation and solvation on the structure-reactivity relationship are highlighted throughout this Minireview with selected examples extracted from recent literature.
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Affiliation(s)
- Vito Capriati
- Dipartimento Farmaco-Chimico, Università di Bari Aldo Moro, Consorzio Interuniversitario Nazionale Metodologie e Processi Innovativi di Sintesi C.I.N.M.P.I.S. Via E. Orabona 4, 70125 Bari, Italy.
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