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Manna S, Paul S, Kong WY, Aich D, Sahoo R, Tantillo DJ, Panda S. Stereodivergent Zweifel Olefination and its Mechanistic Dichotomy. Angew Chem Int Ed Engl 2023; 62:e202309136. [PMID: 37495925 DOI: 10.1002/anie.202309136] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/24/2023] [Accepted: 07/26/2023] [Indexed: 07/28/2023]
Abstract
Stereoselective Zweifel olefination using boronate complexes carrying two different reactive π-systems was achieved to synthesize vinyl heteroarenes and conjugated 1,3-dienes in good yield and up to 100 % stereoselectivity, which remains unexplored until now. Most importantly, we report the unprecedented formation of E vs. Z-vinyl heteroarenes for different heteroarenes under identical conditions. Density functional theory (DFT) investigations unveil the mechanistic dichotomy between olefin and heteroarene activation followed by 1,2-migration, leading to E or Z-vinyl heteroarenes respectively. We also report a previously unknown reversal of stereoselectivity by using 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as an electrophile. The Zweifel olefination using a boronate complex that carries two different olefins was previously unexplored due to significant challenges associated with the site-selective activation of olefins. We have solved this problem and reported the site-selective activation of olefins for the stereoselective synthesis of 1,3-dienes.
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Affiliation(s)
- Samir Manna
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal, India
| | - Swagata Paul
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal, India
| | - Wang-Yeuk Kong
- Department of Chemistry, University of California, Davis, CA 95616, USA
| | - Debasis Aich
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal, India
| | - Rupam Sahoo
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal, India
| | - Dean J Tantillo
- Department of Chemistry, University of California, Davis, CA 95616, USA
| | - Santanu Panda
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal, India
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2
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Fairchild ME, Noble A, Aggarwal VK. Diastereodivergent Synthesis of Cyclopentyl Boronic Esters Bearing Contiguous Fully Substituted Stereocenters. Angew Chem Int Ed Engl 2022; 61:e202205816. [PMID: 35639345 PMCID: PMC9542923 DOI: 10.1002/anie.202205816] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Indexed: 01/02/2023]
Abstract
The synthesis of molecules bearing two or more contiguous, quaternary stereocenters is challenging, owing to the difficulty in controlling stereochemistry whilst simultaneously constructing a sterically congested motif. Herein, we report the electrophile-induced ring contractive 1,2-metallate rearrangement of 6-membered cyclic alkenyl boronate complexes for the synthesis of cyclopentyl boronic esters bearing two contiguous, fully substituted stereocenters with high levels of stereocontrol. Remarkably, simple variation of the reaction solvent enabled their diastereodivergent construction with facile access to complementary diastereomeric pairs. The utility of our methodology is demonstrated in the asymmetric total synthesis of (+)-herbertene-1,14-diol.
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Affiliation(s)
| | - Adam Noble
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
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3
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Fairchild ME, Noble A, Aggarwal VK. Diastereodivergent Synthesis of Cyclopentyl Boronic Esters Bearing Contiguous Fully Substituted Stereocenters. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Molly E. Fairchild
- 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
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4
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Didier D. Forging C–C Bonds through Intramolecular Oxidative Coupling of Organoborates – An Overview. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1757-2680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
AbstractC–C bond formation has challenged the community of synthetic organic chemists for decades. Organoboron derivatives represent a mild and functional-group-tolerant class of reagents that can be handled without the need for inert conditions, making them suitable scaffolds for the development of methods that increase the sustainability of current processes for coupling reactions. This short review summarizes the different approaches that have been developed to enable C–C bond formation through intramolecular rearrangements of organoborate species.1 Introduction2 Oxidative Coupling with Chemical Oxidants3 Electrocoupling of Tetraorganoborates4 Photocoupling of Tetraorganoborates
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5
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Papadopulu Z, Kazeroonian N, Irran E, Oestreich M. One out of Four: Kinetic Resolution of Stereoisomeric Mixtures of Secondary Alcohols with a Quaternary Carbon Atom in the β-Position by Cu-H-Catalyzed Enantioselective Silylation. ACS ORGANIC & INORGANIC AU 2021; 2:164-168. [PMID: 36855454 PMCID: PMC9954319 DOI: 10.1021/acsorginorgau.1c00050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An enantio- and diastereoselective Cu-H-catalyzed silylation of acyclic secondary alcohols with a vicinal quaternary stereocenter is reported. The reaction kinetically selects one out of four stereoisomers, affording the fastest-reacting stereoisomer as the silyl ether in enantio- and diastereomerically enriched form. The obtained motif with a quaternary carbon atom in the β-position of the hydroxy group is otherwise not easy to access.
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6
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Talbot FJT, Zhang S, Satpathi B, Howell GP, Perry GJP, Crisenza GEM, Procter DJ. Modular Synthesis of Stereodefined Benzocyclobutene Derivatives via Sequential Cu- and Pd-Catalysis. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04496] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Fabien J. T. Talbot
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Shibo Zhang
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Bishnupada Satpathi
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Gareth P. Howell
- Chemical Development, Pharmaceutical Technology and Development, Operations, AstraZeneca, Silk Road Business Park, Macclesfield SK10 2NA, U.K
| | - Gregory J. P. Perry
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | | | - David J. Procter
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
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7
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Wang H, Jing C, Noble A, Aggarwal VK. Stereospecific 1,2-Migrations of Boronate Complexes Induced by Electrophiles. Angew Chem Int Ed Engl 2020; 59:16859-16872. [PMID: 32592274 PMCID: PMC7540471 DOI: 10.1002/anie.202008096] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Indexed: 12/16/2022]
Abstract
The stereospecific 1,2-migration of boronate complexes is one of the most representative reactions in boron chemistry. This process has been used extensively to develop powerful methods for asymmetric synthesis, with applications spanning from pharmaceuticals to natural products. Typically, 1,2-migration of boronate complexes is driven by displacement of an α-leaving group, oxidation of an α-boryl radical, or electrophilic activation of an alkenyl boronate complex. The aim of this article is to summarize the recent advances in the rapidly expanding field of electrophile-induced stereospecific 1,2-migration of groups from boron to sp2 and sp3 carbon centers. It will be shown that three different conceptual approaches can be utilized to enable the 1,2-migration of boronate complexes: stereospecific Zweifel-type reactions, catalytic conjunctive coupling reactions, and transition metal-free sp2 -sp3 couplings. A discussion of the reaction scope, mechanistic insights, and synthetic applications of the work described is also presented.
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Affiliation(s)
- Hui Wang
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - Changcheng Jing
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - Adam Noble
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
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8
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Wang H, Jing C, Noble A, Aggarwal VK. Stereospecific 1,2‐Migrations of Boronate Complexes Induced by Electrophiles. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008096] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Hui Wang
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Changcheng Jing
- 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
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Baumann AN, Music A, Dechent J, Müller N, Jagau TC, Didier D. Electro-Olefination-A Catalyst Free Stereoconvergent Strategy for the Functionalization of Alkenes. Chemistry 2020; 26:8382-8387. [PMID: 32203624 PMCID: PMC7383514 DOI: 10.1002/chem.202001394] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Indexed: 01/09/2023]
Abstract
Conventional methods carrying out C(sp2 )-C(sp2 ) bond formations are typically mediated by transition-metal-based catalysts. Herein, we conceptualize a complementary avenue to access such bonds by exploiting the potential of electrochemistry in combination with organoboron chemistry. We demonstrate a transition metal catalyst-free electrocoupling between (hetero)aryls and alkenes through readily available alkenyl-tri(hetero)aryl borate salts (ATBs) in a stereoconvergent fashion. This unprecedented transformation was investigated theoretically and experimentally and led to a library of functionalized alkenes. The concept was then carried further and applied to the synthesis of the natural product pinosylvin and the derivatization of the steroidal dehydroepiandrosterone (DHEA) scaffold.
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Affiliation(s)
- Andreas N. Baumann
- Department of Chemistry and PharmacyLudwig-Maximilians-University MunichButenandtstraße 5–13, Haus F81377MunichGermany
| | - Arif Music
- Department of Chemistry and PharmacyLudwig-Maximilians-University MunichButenandtstraße 5–13, Haus F81377MunichGermany
| | - Jonas Dechent
- Department of Chemistry and PharmacyLudwig-Maximilians-University MunichButenandtstraße 5–13, Haus F81377MunichGermany
| | - Nicolas Müller
- Department of Chemistry and PharmacyLudwig-Maximilians-University MunichButenandtstraße 5–13, Haus F81377MunichGermany
| | - Thomas C. Jagau
- Department of Chemistry and PharmacyLudwig-Maximilians-University MunichButenandtstraße 5–13, Haus F81377MunichGermany
| | - Dorian Didier
- Department of Chemistry and PharmacyLudwig-Maximilians-University MunichButenandtstraße 5–13, Haus F81377MunichGermany
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10
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Kalita SJ, Cheng F, Huang Y. Recent Advances of Applying Boron‐Reagents in Asymmetric Total Syntheses of Natural Products and Bio‐Active Molecules. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000413] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Subarna Jyoti Kalita
- Department of Chemistry, School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 People's Republic of China
| | - Feng Cheng
- Department of Chemistry, School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 People's Republic of China
| | - Yi‐Yong Huang
- Department of Chemistry, School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 People's Republic of China
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11
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Davenport R, Silvi M, Noble A, Hosni Z, Fey N, Aggarwal VK. Visible-Light-Driven Strain-Increase Ring Contraction Allows the Synthesis of Cyclobutyl Boronic Esters. Angew Chem Int Ed Engl 2020; 59:6525-6528. [PMID: 31912963 DOI: 10.1002/anie.201915409] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Indexed: 12/19/2022]
Abstract
There are a limited number of ring-contraction methodologies which convert readily available five-membered rings into strained four-membered rings. Here we report a photo-induced radical-mediated ring contraction of five-membered-ring alkenyl boronate complexes into cyclobutanes. The process involves the addition of an electrophilic radical to the electron-rich alkenyl boronate complex, leading to an α-boryl radical. Upon one-electron oxidation, ring-contractive 1,2-metalate rearrangement occurs to give a cyclobutyl boronic ester. A range of radical precursors and vinyl boronates can be employed, and chiral cyclobutanes can be accessed with high levels of stereocontrol. The process was extended to the preparation of benzofused cyclobutenes and the versatility of the boronic ester was demonstrated by conversion to other functional groups.
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Affiliation(s)
- Raffael Davenport
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Mattia Silvi
- 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
| | - Zied Hosni
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Natalie Fey
- 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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12
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Davenport R, Silvi M, Noble A, Hosni Z, Fey N, Aggarwal VK. Visible‐Light‐Driven Strain‐Increase Ring Contraction Allows the Synthesis of Cyclobutyl Boronic Esters. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201915409] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Raffael Davenport
- School of ChemistryUniversity of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Mattia Silvi
- School of ChemistryUniversity of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Adam Noble
- School of ChemistryUniversity of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Zied Hosni
- School of ChemistryUniversity of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Natalie Fey
- School of ChemistryUniversity of Bristol Cantock's Close Bristol BS8 1TS UK
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13
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Hancock EN, Kuker EL, Tantillo DJ, Brown MK. Lessons in Strain and Stability: Enantioselective Synthesis of (+)-[5]-Ladderanoic Acid. Angew Chem Int Ed Engl 2020; 59:436-441. [PMID: 31650679 PMCID: PMC6923594 DOI: 10.1002/anie.201910901] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 10/14/2019] [Indexed: 11/07/2022]
Abstract
The synthesis of structurally complex and highly strained natural products provides unique challenges and unexpected opportunities for the development of new reactions and strategies. Herein, the synthesis of (+)-[5]-ladderanoic acid is reported. En route to the target, unusual and unexpected strain release driven transformations were uncovered. This occurrence required a drastic revision of the synthetic design that ultimately led to the development of a novel stepwise cyclobutane assembly by an allylboration/Zweifel olefination sequence.
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Affiliation(s)
- Erin N. Hancock
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave. Bloomington, IN 47401
| | - Erin L. Kuker
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave. Bloomington, IN 47401
| | - Dean J. Tantillo
- Department of Chemistry, University of California Davis, 1 Shields Ave. Davis, CA 95616
| | - M. Kevin Brown
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave. Bloomington, IN 47401
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14
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Delany PK, Hodgson DM. Synthesis and Homologation of an Azetidin-2-yl Boronic Ester with α-Lithioalkyl Triisopropylbenzoates. Org Lett 2019; 21:9981-9984. [PMID: 31800252 DOI: 10.1021/acs.orglett.9b03901] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An α-boryl azetidine, obtained by α-lithiation-borylation of N-Botc azetidine, undergoes reaction with α-triisopropylbenzoyloxy organolithiums to give homologated boronic esters that can be further oxidized, homologated, arylated, and deprotected to give a range of α-substituted azetidines. Scalemic α-boryl azetidine-α-triisopropylbenzoyloxy organolithium pairings show stereospecific reagent control, providing access to either diastereomeric series of homologated boronic esters with very high er's.
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Affiliation(s)
- Pascal K Delany
- Department of Chemistry, Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K
| | - David M Hodgson
- Department of Chemistry, Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K
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15
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Hancock EN, Kuker EL, Tantillo DJ, Brown MK. Lessons in Strain and Stability: Enantioselective Synthesis of (+)‐[5]‐Ladderanoic Acid. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201910901] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Erin N. Hancock
- Department of Chemistry Indiana University 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Erin L. Kuker
- Department of Chemistry Indiana University 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Dean J. Tantillo
- Department of Chemistry University of California Davis 1 Shields Ave. Davis CA 95616 USA
| | - M. Kevin Brown
- Department of Chemistry Indiana University 800 E. Kirkwood Ave. Bloomington IN 47401 USA
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16
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Yang X, Kalita SJ, Maheshuni S, Huang YY. Recent advances on transition-metal-catalyzed asymmetric tandem reactions with organoboron reagents. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.04.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Music A, Baumann AN, Spieß P, Hilgert N, Köllen M, Didier D. Single-Pot Access to Bisorganoborinates: Applications in Zweifel Olefination. Org Lett 2019; 21:2189-2193. [PMID: 30864807 DOI: 10.1021/acs.orglett.9b00493] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Zweifel olefination is a catalyst-free reaction that serves alkene functionalization. While most methods employ commercially available boron pinacol esters, we have assembled a sequence in which the two partners of the formal coupling reaction are installed successively, starting from inexpensive boron alkoxides. The in situ formation of bisorganoborinates was accomplished by consecutive reaction of two different organometallic species. This single-pot procedure represents a great advancement in the generation of organoborinates and their involvement in C-C bond formation.
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Affiliation(s)
- Arif Music
- Department of Chemistry and Pharmacy , Ludwig-Maximilians-Universität München , Butenandtstraße 5-13 , 81377 Munich , Germany
| | - Andreas N Baumann
- Department of Chemistry and Pharmacy , Ludwig-Maximilians-Universität München , Butenandtstraße 5-13 , 81377 Munich , Germany
| | - Philipp Spieß
- Department of Chemistry and Pharmacy , Ludwig-Maximilians-Universität München , Butenandtstraße 5-13 , 81377 Munich , Germany
| | - Nicolas Hilgert
- Department of Chemistry and Pharmacy , Ludwig-Maximilians-Universität München , Butenandtstraße 5-13 , 81377 Munich , Germany
| | - Martin Köllen
- Department of Chemistry and Pharmacy , Ludwig-Maximilians-Universität München , Butenandtstraße 5-13 , 81377 Munich , Germany
| | - Dorian Didier
- Department of Chemistry and Pharmacy , Ludwig-Maximilians-Universität München , Butenandtstraße 5-13 , 81377 Munich , Germany
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18
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Mykura RC, Veth S, Varela A, Dewis L, Farndon JJ, Myers EL, Aggarwal VK. Investigation of the Deprotonative Generation and Borylation of Diamine-Ligated α-Lithiated Carbamates and Benzoates by in Situ IR spectroscopy. J Am Chem Soc 2018; 140:14677-14686. [PMID: 30260635 DOI: 10.1021/jacs.8b06871] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diamine-mediated α-deprotonation of O-alkyl carbamates or benzoates with alkyllithium reagents, trapping of the carbanion with organoboron compounds, and 1,2-metalate rearrangement of the resulting boronate complex are the primary steps by which organoboron compounds can be stereoselectively homologated. Although the final step can be easily monitored by 11B NMR spectroscopy, the first two steps, which are typically carried out at cryogenic temperatures, are less well understood owing to the requirement for specialized analytical techniques. Investigation of these steps by in situ IR spectroscopy has provided invaluable data for optimizing the homologation reactions of organoboron compounds. Although the deprotonation of benzoates in noncoordinating solvents is faster than that in ethereal solvents, the deprotonation of carbamates shows the opposite trend, a difference that has its origin in the propensity of carbamates to form inactive parasitic complexes with the diamine-ligated alkyllithium reagent. Borylation of bulky diamine-ligated lithiated species in toluene is extremely slow, owing to the requirement for initial complexation of the oxygen atoms of the diol ligand on boron with the lithium ion prior to boron-lithium exchange. However, ethereal solvent, or very small amounts of THF, facilitate precomplexation through initial displacement of the bulky diamines coordinated to the lithium ion. Comparison of the carbonyl stretching frequencies of boronates derived from pinacol boronic esters with those derived from trialkylboranes suggests that the displaced lithium ion is residing on the pinacol oxygen atoms and the benzoate/carbamate carbonyl group, respectively, explaining, at least in part, the faster 1,2-metalate rearrangements of boronates derived from the trialkylboranes.
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Affiliation(s)
- Rory C Mykura
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | - Simon Veth
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | - Ana Varela
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | - Lydia Dewis
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | - Joshua J Farndon
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | - Eddie L Myers
- School of Chemistry , NUI Galway , Galway H91 TK33 , Ireland
| | - Varinder K Aggarwal
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
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19
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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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20
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Armstrong RJ, Niwetmarin W, Aggarwal VK. Synthesis of Functionalized Alkenes by a Transition-Metal-Free Zweifel Coupling. Org Lett 2017; 19:2762-2765. [PMID: 28453280 DOI: 10.1021/acs.orglett.7b01124] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Zweifel reaction is a powerful method for the synthesis of alkenes, serving as a transition-metal-free alternative to the Suzuki-Miyaura reaction. To date, the scope of the Zweifel coupling has been rather narrow and has focused mainly on the coupling of vinyllithium reagents to synthesize simple aryl- and alkyl-substituted olefins. Herein, the development of a general transition-metal-free coupling process enabling the coupling of Grignard reagents or organolithiums is described. This method enables the enantiospecific synthesis of a wide variety of functionalized acyclic and cyclic olefin products.
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Affiliation(s)
- Roly J Armstrong
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, U.K
| | - Worawat Niwetmarin
- 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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21
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Armstrong RJ, García‐Ruiz C, Myers EL, Aggarwal VK. Stereodivergent Olefination of Enantioenriched Boronic Esters. Angew Chem Int Ed Engl 2017; 56:786-790. [PMID: 27958668 PMCID: PMC5347846 DOI: 10.1002/anie.201610387] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Indexed: 11/17/2022]
Abstract
A stereodivergent coupling reaction between vinyl halides and boronic esters is described. This coupling process proceeds without a transition-metal catalyst, instead proceeding by electrophilic selenation or iodination of a vinyl boronate complex followed by stereospecific syn or anti elimination. Chiral, nonracemic boronic esters could be coupled with complete enantiospecificity. The process enables the highly stereoselective synthesis of either the E or Z alkene from a single isomer of a vinyl coupling partner.
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Affiliation(s)
- Roly J. Armstrong
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | | | - Eddie L. Myers
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
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22
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Sandford C, Aggarwal VK. Stereospecific functionalizations and transformations of secondary and tertiary boronic esters. Chem Commun (Camb) 2017; 53:5481-5494. [DOI: 10.1039/c7cc01254c] [Citation(s) in RCA: 342] [Impact Index Per Article: 48.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This feature article discusses the range of stereospecific transformations available to enantioenriched boronic esters, and their applications in synthesis.
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23
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Zhao H, Tong M, Wang H, Xu S. Transition-metal-free synthesis of 1,1-diboronate esters with a fully substituted benzylic center via diborylation of lithiated carbamates. Org Biomol Chem 2017; 15:3418-3422. [DOI: 10.1039/c7ob00654c] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Diborylation of lithiated carbamates is reported for the first time to synthesize 1,1-diboronate esters with a fully substituted benzylic center.
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Affiliation(s)
- Haonan Zhao
- Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Min Tong
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Suzhou Research Institute
- Lanzhou Institute of Chemical Physics (LICP)
- Chinese Academy of Sciences
- Lanzhou 730000
| | - Haijun Wang
- Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Senmiao Xu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Suzhou Research Institute
- Lanzhou Institute of Chemical Physics (LICP)
- Chinese Academy of Sciences
- Lanzhou 730000
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24
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Armstrong RJ, García‐Ruiz C, Myers EL, Aggarwal VK. Stereodivergent Olefination of Enantioenriched Boronic Esters. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201610387] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Roly J. Armstrong
- 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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25
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Ling T, Rivas F. All-carbon quaternary centers in natural products and medicinal chemistry: recent advances. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.09.002] [Citation(s) in RCA: 155] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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26
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Holec C, Neufeld K, Pietruszka J. P450 BM3 Monooxygenase as an Efficient NAD(P)H-Oxidase for Regeneration of Nicotinamide Cofactors in ADH-Catalysed Preparative Scale Biotransformations. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600241] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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27
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Su X, Sun Y, Yao J, Chen H, Chen C. Acid-promoted bicyclization of arylacetylenes to benzobicyclo[3.2.1]octanes through cationic rearrangements. Chem Commun (Camb) 2016; 52:4537-40. [PMID: 26935906 DOI: 10.1039/c6cc00452k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Acid-promoted site- and stereo-selective bicyclization of alkynes to benzobicyclo[3.2.1]octanes was realized with atom- and step-economy. The reaction proceeded through two C–C bonds formed on remote alkyl C–H bonds via twice long-distance cationic rearrangement.
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Affiliation(s)
- Xiang Su
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education)
- Department of Chemistry
- Tsinghua University
- Beijing
- China
| | - Yihua Sun
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- CAS Key Laboratory of Photochemistry Institute of Chemistry
- Chinese Academy of Sciences
- Beijing
- China
| | - Jiannian Yao
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- CAS Key Laboratory of Photochemistry Institute of Chemistry
- Chinese Academy of Sciences
- Beijing
- China
| | - Hui Chen
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- CAS Key Laboratory of Photochemistry Institute of Chemistry
- Chinese Academy of Sciences
- Beijing
- China
| | - Chao Chen
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education)
- Department of Chemistry
- Tsinghua University
- Beijing
- China
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28
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Hu J, Sun H, Cai W, Pu X, Zhang Y, Shi Z. Nickel-Catalyzed Borylation of Aryl- and Benzyltrimethylammonium Salts via C–N Bond Cleavage. J Org Chem 2015; 81:14-24. [DOI: 10.1021/acs.joc.5b02557] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jiefeng Hu
- State Key Laboratory of Coordination
Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Heqing Sun
- State Key Laboratory of Coordination
Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Wangshui Cai
- State Key Laboratory of Coordination
Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Xinghui Pu
- State Key Laboratory of Coordination
Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Yemin Zhang
- State Key Laboratory of Coordination
Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Zhuangzhi Shi
- State Key Laboratory of Coordination
Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
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29
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Brown CA, Aggarwal VK. Short Convergent Synthesis of the Mycolactone Core Through Lithiation-Borylation Homologations. Chemistry 2015; 21:13900-3. [PMID: 26332797 PMCID: PMC6519258 DOI: 10.1002/chem.201503122] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Indexed: 12/17/2022]
Abstract
Using iterative lithiation-borylation homologations, the mycolactone toxin core has been synthesized in 13 steps and 17% overall yield. The rapid build-up of molecular complexity, high convergence and high stereoselectivity are noteworthy features of this synthesis.
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Affiliation(s)
- Christopher A Brown
- 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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30
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Palau-Lluch G, Fernández E. Synthesis of 2-Aryl-1,3-Cyclopentanediones through Catalytic Borylation as a Key Step. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500229] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Gerard Palau-Lluch
- Department Quimica Física i Inorganica; University Rovira i Virgili; C/Marcel⋅li Domingo S/N Tarragona 43007 Spain
| | - Elena Fernández
- Department Quimica Física i Inorganica; University Rovira i Virgili; C/Marcel⋅li Domingo S/N Tarragona 43007 Spain
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31
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Roesner S, Blair DJ, Aggarwal VK. Enantioselective installation of adjacent tertiary benzylic stereocentres using lithiation-borylation-protodeboronation methodology. Application to the synthesis of bifluranol and fluorohexestrol. Chem Sci 2015; 6:3718-3723. [PMID: 29218141 PMCID: PMC5707455 DOI: 10.1039/c4sc03901g] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 04/11/2015] [Indexed: 12/14/2022] Open
Abstract
1,2-Diaryl ethanes bearing 1,2-stereogenic centres show interesting biological activity but their stereocontrolled synthesis has not been reported forcing a reliance of methods involving diastereomer and enantiomer separation. We have found that this class of molecules can be prepared with very high stereocontrol using lithiation-borylation methodology. The reaction of an enantioenriched benzylic lithiated carbamate with an enantioenriched benzylic secondary pinacol boronic ester gave a tertiary boronic ester with complete diastereo- and enantiocontrol. It was essential to use MgBr2/MeOH after formation of the boronate complex, both to promote the 1,2-migration and to trap any lithiated carbamate/benzylic anion that formed from fragmentation of the ate complex, anions that would otherwise racemise and re-form the boronate complex eroding both er and dr of the product. When the benzylic lithiated carbamate and benzylic secondary pinacol boronic ester were too hindered, boronate complex did not even form. In these cases, it was found that the use of the less hindered neopentyl boronic esters enabled successful homologation to take place even for the most hindered reaction partners, with high stereocontrol and without the need for additives. Protodeboronation of the product boronic esters with TBAF gave the target 1,2-diaryl ethanes bearing 1,2-stereogenic centres. The methodology was applied to the stereocontrolled synthesis of bifluranol and fluorohexestrol in just 7 and 5 steps, respectively.
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Affiliation(s)
- Stefan Roesner
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK . ; ; Tel: +44 (0)117 954 6315
| | - Daniel J Blair
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK . ; ; Tel: +44 (0)117 954 6315
| | - Varinder K Aggarwal
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK . ; ; Tel: +44 (0)117 954 6315
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32
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Zheng K, Xie C, Hong R. Bioinspired iterative synthesis of polyketides. Front Chem 2015; 3:32. [PMID: 26052510 PMCID: PMC4439576 DOI: 10.3389/fchem.2015.00032] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2015] [Accepted: 04/27/2015] [Indexed: 11/13/2022] Open
Abstract
Diverse array of biopolymers and second metabolites (particularly polyketide natural products) has been manufactured in nature through an enzymatic iterative assembly of simple building blocks. Inspired by this strategy, molecules with inherent modularity can be efficiently synthesized by repeated succession of similar reaction sequences. This privileged strategy has been widely adopted in synthetic supramolecular chemistry. Its value also has been reorganized in natural product synthesis. A brief overview of this approach is given with a particular emphasis on the total synthesis of polyol-embedded polyketides, a class of vastly diverse structures and biologically significant natural products. This viewpoint also illustrates the limits of known individual modules in terms of diastereoselectivity and enantioselectivity. More efficient and practical iterative strategies are anticipated to emerge in the future development.
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Affiliation(s)
| | | | - Ran Hong
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of SciencesShanghai, China
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33
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34
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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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35
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Essafi S, Tomasi S, Aggarwal VK, Harvey JN. Homologation of boronic esters with organolithium compounds: a computational assessment of mechanism. J Org Chem 2014; 79:12148-58. [PMID: 25318004 DOI: 10.1021/jo502020e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Ab initio calculations are reported for the reaction of methyl boronic ester with organolithium reagents with α-leaving groups. The best calculations rely on density functional theory prediction of structures and coupled-cluster theory calculation of accurate potential energies. The results provide strong confirmation of the feasibility of a two-step mechanism with rapid initial formation of a boron-ate complex followed by slower migration of methyl from boron to carbon with loss of the leaving group. The calculated free energy of activation is consistent with observed kinetic behavior, and the calculations provide a framework for exploring substituent and other effects on reactivity. Obtaining reasonable agreement with experiment in this way is not trivial and requires careful treatment of level of theory (density functional theory calculations tend to yield inaccurate results), of conformational complexity, especially for the ate complexes, and of the nature of the microscopic model of reactants and solvent. The methodological challenges and possible pitfalls, many of which are relevant more broadly to computational modeling of organic reaction mechanisms, are discussed in detail.
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Affiliation(s)
- Stéphanie Essafi
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, U.K
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36
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Leonori D, Aggarwal VK. Lithiation-borylation methodology and its application in synthesis. Acc Chem Res 2014; 47:3174-83. [PMID: 25262745 DOI: 10.1021/ar5002473] [Citation(s) in RCA: 278] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Developing new methods that enable the synthesis of new and complex molecules with complete control of their 3-D shape is central to the advancement of synthetic chemistry with applications spanning from medicine to materials. Our approach consists of the iterative combination of small building blocks through the use of boron chemistry to essentially "grow" molecules. This approach, which we term assembly-line synthesis (ALS), resembles the way that nature assembles natural products (e.g., the polyketide synthase machinery) and has the advantage that many structural variations can be easily introduced and the products can be evaluated in structural or biological contexts. Chiral boronic esters have been recognized as valuable building blocks due to their unique chemical properties. They are both chemically and configurationally stable, and they can be prepared with very high levels of enantioselectivity. Additionally they undergo a broad array of transformations that lead to the stereocontrolled formation of C-C and C-X (X = heteroatom) bonds. This versatility makes boronic acids ideal building blocks for iterative molecular assembly. A powerful reaction platform for chemical diversification using chiral boronic esters is their homologation using lithium carbenoids via 1,2-metalate rearrangement. In the 1980s, Matteson described the use of boronic esters bearing a chiral diol in a two-step homologation process with dichloromethyl lithium and Grignard reagents (substrate-controlled approach). We have focused on reagent control and have found that Hoppe's chiral lithiated carbamates can be used as carbenoid equivalents in conjunction with achiral boronic esters. This reagent-controlled process offers many advantages due to the easy access of both the chiral lithiated carbamates and stable boronic esters. The carbamates can be derived from primary or secondary alcohols, and a broad range of functionalized boronic esters and boranes can be employed. Multiple homologations can be carried out in a one-pot sequence thereby streamlining the process to a single operation. This methodology has enabled the synthesis of many molecules containing multiple contiguous stereogenic centers with exquisite 3-D control. In this Account, we trace our own studies to establish the lithiation-borylation methodology and describe selected synthetic applications.
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Affiliation(s)
- Daniele Leonori
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, U.K
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37
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Burns M, Essafi S, Bame JR, Bull SP, Webster MP, Balieu S, Dale JW, Butts CP, Harvey JN, Aggarwal VK. Assembly-line synthesis of organic molecules with tailored shapes. Nature 2014; 513:183-8. [PMID: 25209797 PMCID: PMC4167605 DOI: 10.1038/nature13711] [Citation(s) in RCA: 213] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Accepted: 07/23/2014] [Indexed: 12/24/2022]
Abstract
Molecular assembly lines, where molecules undergo iterative processes involving chain elongation and functional group manipulation are hallmarks of many processes found in Nature. We have sought to emulate Nature in the development of our own molecular assembly line through iterative homologations of boronic esters. Here we report a reagent (α-lithioethyl triispopropylbenzoate) which inserts into carbon-boron bonds with exceptionally high fidelity and stereocontrol. Through repeated iteration we have converted a simple boronic ester into a complex molecule (a carbon chain with ten contiguous methyl groups) with remarkably high precision over its length, its stereochemistry and therefore its shape. Different stereoisomers were targeted and it was found that they adopted different shapes (helical/linear) according to their stereochemistry. This work should now enable scientists to rationally design and create molecules with predictable shape, which could have an impact in all areas of molecular sciences where bespoke molecules are required.
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Affiliation(s)
- Matthew Burns
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
| | - Stéphanie Essafi
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
| | - Jessica R Bame
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
| | - Stephanie P Bull
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
| | - Matthew P Webster
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
| | - Sébastien Balieu
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
| | - James W Dale
- Novartis Horsham Research Centre, Wimblehurst Road, Horsham, West Sussex RH13 5AB, UK
| | - Craig P Butts
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
| | - Jeremy N Harvey
- 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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38
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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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