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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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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. [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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3
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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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4
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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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5
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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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7
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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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8
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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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9
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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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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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11
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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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12
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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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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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14
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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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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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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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