1
|
Thorpe MP, Blackwell DJ, Knollmann BC, Johnston JN. Backbone-Determined Antiarrhythmic Structure-Activity Relationships for a Mirror Image, Oligomeric Depsipeptide Natural Product. J Med Chem 2024. [PMID: 38958200 DOI: 10.1021/acs.jmedchem.4c00923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Cyclic oligomeric depsipeptides (COD) are a structural class within naturally occurring compounds with a wide range of biological activity. Verticilide is a COD (24-membered ring) that was identified by its inhibition of insect ryanodine receptor (RyR). We have since found that the enantiomer of verticilide (ent-verticilide, 1) is a potent inhibitor of mammalian RyR2, a cardiac calcium channel, and therefore a potential antiarrhythmic agent. Oddly, nat-verticilide does not inhibit RyR2. To further develop ent-verticilide as an antiarrhythmic, we explored potential SAR through systematic modification of the ester's functionality to both N-H and N-Me amides. The syntheses of these ent-verticilide-inspired analogs are detailed using a monomer-based platform enabled by enantioselective catalysis. Two analogs among 23 exhibited measurable reduction of calcium sparks in a functional assay of RyR2 activity. These findings illustrate the value of natural product-inspired therapeutic development, but the less-studied approach where the non-natural enantiomeric series harbors important SAR.
Collapse
Affiliation(s)
- Madelaine P Thorpe
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Daniel J Blackwell
- Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37235, United States
| | - Bjorn C Knollmann
- Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37235, United States
| | - Jeffrey N Johnston
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| |
Collapse
|
2
|
Deng Z, Padalino MA, Jan JEL, Park S, Danneman MW, Johnston JN. Generality-Driven Catalyst Development: A Universal Catalyst for Enantioselective Nitroalkene Reduction. J Am Chem Soc 2024; 146:1269-1275. [PMID: 38176098 PMCID: PMC10862354 DOI: 10.1021/jacs.3c12436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
Cracking the selectivity-generality paradox is among the most pressing challenges in asymmetric catalysis. This obstacle prevents the immediate and successful translation of new methods to diverse small molecules. This is particularly rate-limiting for therapeutic development, where availability and structural diversity are often critical components of successful campaigns. Here we describe the union of generality-driven enantioselective catalysis and the preparation of diverse peptidomimetics. A single new organocatalyst provides high selectivity and substrate generality that is matched only by a combination of metal and organocatalysts. Within organocatalysis, this discovery breaks a 16-year monolithic paradigm, uncovering a powerful new scaffold for enantioselective reduction with behavior that suggests the recognition of a nitroethylene minimal catalaphile.
Collapse
Affiliation(s)
- Zihang Deng
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235
| | - Melanie A. Padalino
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235
| | - Julius E. L. Jan
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235
| | - Sangjun Park
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235
| | - Michael W. Danneman
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235
| | - Jeffrey N. Johnston
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235
| |
Collapse
|
3
|
Crocker MS, Deng Z, Johnston JN. Preparation of N-Aryl Amides by Epimerization-Free Umpolung Amide Synthesis. J Am Chem Soc 2022; 144:16708-16714. [PMID: 36067492 PMCID: PMC9634722 DOI: 10.1021/jacs.2c05986] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Amide synthesis is one of the most widely practiced chemical reactions, owing to its use in drug development and peptide synthesis. Despite the importance of these applications, the attendant effort to eliminate waste associated with these protocols has met with limited success, and pernicious α-epimerization is most often minimized but not eliminated when targeting challenging amides (e.g., N-aryl amides). This effort has focused on what is essentially a single paradigm in amide formation wherein an electrophilic acyl donor reacts with a nucleophilic amine. Umpolung amide synthesis (UmAS) emerged from α-halo nitroalkane reactions with amines and has since been developed into a method for the synthesis of enantiopure amides using entirely catalytic, enantioselective synthesis. However, its inability to forge N-aryl amides has been a longstanding problem, one limiting its application more broadly in drug development where α-chiral N-aryl amides are increasingly common. We report here the reaction of α-fluoronitroalkanes and N-aryl hydroxyl amines for the direct synthesis of N-aryl amides using a simple Brønsted base as the promoter. No other activating agents are required, and experiments guided by mechanistic hypotheses outline a mechanism based on the UmAS paradigm and confirm that the N-aryl amide, not the N-aryl hydroxamic acid, is the direct product. Ultimately, select chiral α-amino-N-aryl amides were prepared with complete conservation of enantioenrichment, in contrast to a parallel demonstration of their ability to epimerize using the conventional amide synthesis alternative.
Collapse
Affiliation(s)
- Michael S. Crocker
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - Zihang Deng
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - Jeffrey N. Johnston
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, USA
| |
Collapse
|
4
|
Santos C, Pimentel L, Canzian H, Oliveira A, Junior F, Dantas R, Hoelz L, Marinho D, Cunha A, Bastos M, Boechat N. Hybrids of Imatinib with Quinoline: Synthesis, Antimyeloproliferative Activity Evaluation, and Molecular Docking. Pharmaceuticals (Basel) 2022; 15:ph15030309. [PMID: 35337107 PMCID: PMC8950477 DOI: 10.3390/ph15030309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 02/09/2022] [Accepted: 02/13/2022] [Indexed: 02/01/2023] Open
Abstract
Imatinib (IMT) is the first-in-class BCR-ABL commercial tyrosine kinase inhibitor (TKI). However, the resistance and toxicity associated with the use of IMT highlight the importance of the search for new TKIs. In this context, heterocyclic systems, such as quinoline, which is present as a pharmacophore in the structure of the TKI inhibitor bosutinib (BST), have been widely applied. Thus, this work aimed to obtain new hybrids of imatinib containing quinoline moieties and evaluate them against K562 cells. The compounds were synthesized with a high purity degree. Among the produced molecules, the inhibitor 4-methyl-N3-(4-(pyridin-3-yl)pyrimidin-2-yl)-N1-(quinolin-4-yl)benzene-1,3-diamine (2g) showed a suitable reduction in cell viability, with a CC50 value of 0.9 µM (IMT, CC50 = 0.08 µM). Molecular docking results suggest that the interaction between the most active inhibitor 2g and the BCR-ABL1 enzyme occurs at the bosutinib binding site through a competitive inhibition mechanism. Despite being less potent and selective than IMT, 2g is a suitable prototype for use in the search for new drugs against chronic myeloid leukemia (CML), especially in patients with acquired resistance to IMT.
Collapse
Affiliation(s)
- Carine Santos
- Laboratório de Sintese de Farmacos-LASFAR, Instituto de Tecnologia em Farmacos-Farmanguinhos, FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, Brazil; (C.S.); (L.P.); (H.C.); (A.O.); (L.H.); (D.M.); (M.B.)
- Programa de Pós-graduação em Farmacologia e Química Medicinal do Instituto de Ciências Biomédicas–ICB-UFRJ, Centro de Ciências da Saúde-CCS, Bloco J, Ilha do Fundão, Rio de Janeiro 21941-902, Brazil
| | - Luiz Pimentel
- Laboratório de Sintese de Farmacos-LASFAR, Instituto de Tecnologia em Farmacos-Farmanguinhos, FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, Brazil; (C.S.); (L.P.); (H.C.); (A.O.); (L.H.); (D.M.); (M.B.)
| | - Henayle Canzian
- Laboratório de Sintese de Farmacos-LASFAR, Instituto de Tecnologia em Farmacos-Farmanguinhos, FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, Brazil; (C.S.); (L.P.); (H.C.); (A.O.); (L.H.); (D.M.); (M.B.)
| | - Andressa Oliveira
- Laboratório de Sintese de Farmacos-LASFAR, Instituto de Tecnologia em Farmacos-Farmanguinhos, FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, Brazil; (C.S.); (L.P.); (H.C.); (A.O.); (L.H.); (D.M.); (M.B.)
- Programa de Pós-graduação em Farmacologia e Química Medicinal do Instituto de Ciências Biomédicas–ICB-UFRJ, Centro de Ciências da Saúde-CCS, Bloco J, Ilha do Fundão, Rio de Janeiro 21941-902, Brazil
| | - Floriano Junior
- Laboratório de Bioquímica Experimental e Computacional de Fármacos, Instituto Oswaldo Cruz FIOCRUZ, Av. Brasil 4365, Manguinhos, Rio de Janeiro 21040-360, Brazil; (F.J.); (R.D.)
| | - Rafael Dantas
- Laboratório de Bioquímica Experimental e Computacional de Fármacos, Instituto Oswaldo Cruz FIOCRUZ, Av. Brasil 4365, Manguinhos, Rio de Janeiro 21040-360, Brazil; (F.J.); (R.D.)
| | - Lucas Hoelz
- Laboratório de Sintese de Farmacos-LASFAR, Instituto de Tecnologia em Farmacos-Farmanguinhos, FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, Brazil; (C.S.); (L.P.); (H.C.); (A.O.); (L.H.); (D.M.); (M.B.)
| | - Debora Marinho
- Laboratório de Sintese de Farmacos-LASFAR, Instituto de Tecnologia em Farmacos-Farmanguinhos, FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, Brazil; (C.S.); (L.P.); (H.C.); (A.O.); (L.H.); (D.M.); (M.B.)
| | - Anna Cunha
- Departamento de Química Orgânica, Campus do Valonguinho, Universidade Federal Fluminense–UFF, Niterói 24020-150, Brazil;
| | - Monica Bastos
- Laboratório de Sintese de Farmacos-LASFAR, Instituto de Tecnologia em Farmacos-Farmanguinhos, FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, Brazil; (C.S.); (L.P.); (H.C.); (A.O.); (L.H.); (D.M.); (M.B.)
- Programa de Pós-graduação em Farmacologia e Química Medicinal do Instituto de Ciências Biomédicas–ICB-UFRJ, Centro de Ciências da Saúde-CCS, Bloco J, Ilha do Fundão, Rio de Janeiro 21941-902, Brazil
| | - Nubia Boechat
- Laboratório de Sintese de Farmacos-LASFAR, Instituto de Tecnologia em Farmacos-Farmanguinhos, FIOCRUZ, Rua Sizenando Nabuco 100, Manguinhos, Rio de Janeiro 21041-250, Brazil; (C.S.); (L.P.); (H.C.); (A.O.); (L.H.); (D.M.); (M.B.)
- Programa de Pós-graduação em Farmacologia e Química Medicinal do Instituto de Ciências Biomédicas–ICB-UFRJ, Centro de Ciências da Saúde-CCS, Bloco J, Ilha do Fundão, Rio de Janeiro 21941-902, Brazil
- Correspondence: ; Tel.: +55-(21)-3977-2465
| |
Collapse
|
5
|
Luxenburger A, Bougen-Zhukov N, Fraser MG, Beetham H, Harris LD, Schmidt D, Cameron SA, Guilford PJ, Evans GB. Discovery of AL-GDa62 as a Potential Synthetic Lethal Lead for the Treatment of Gastric Cancer. J Med Chem 2021; 64:18114-18142. [PMID: 34878770 DOI: 10.1021/acs.jmedchem.1c01609] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Diffuse gastric cancer and lobular breast cancer are aggressive malignancies that are frequently associated with inactivating mutations in the tumor suppressor gene CDH1. Synthetic lethal (SL) vulnerabilities arising from CDH1 dysfunction represent attractive targets for drug development. Recently, SLEC-11 (1) emerged as a SL lead in E-cadherin-deficient cells. Here, we describe our efforts to optimize 1. Overall, 63 analogues were synthesized and tested for their SL activity toward isogenic mammary epithelial CDH1-deficient cells (MCF10A-CDH1-/-). Among the 26 compounds with greater cytotoxicity, AL-GDa62 (3) was four-times more potent and more selective than 1 with an EC50 ratio of 1.6. Furthermore, 3 preferentially induced apoptosis in CDH1-/- cells, and Cdh1-/- mammary and gastric organoids were significantly more sensitive to 3 at low micromolar concentrations. Thermal proteome profiling of treated MCF10A-CDH1-/- cell protein lysates revealed that 3 specifically inhibits TCOF1, ARPC5, and UBC9. In vitro, 3 inhibited SUMOylation at low micromolar concentrations.
Collapse
Affiliation(s)
- Andreas Luxenburger
- Ferrier Research Institute, Victoria University of Wellington, 69 Gracefield Rd, Lower Hutt 5040, New Zealand
| | - Nicola Bougen-Zhukov
- Cancer Genetics Laboratory, Department of Biochemistry, University of Otago, 710 Cumberland Street, Dunedin 9016, New Zealand
| | - Michael G Fraser
- Ferrier Research Institute, Victoria University of Wellington, 69 Gracefield Rd, Lower Hutt 5040, New Zealand
| | - Henry Beetham
- Cancer Genetics Laboratory, Department of Biochemistry, University of Otago, 710 Cumberland Street, Dunedin 9016, New Zealand
| | - Lawrence D Harris
- Ferrier Research Institute, Victoria University of Wellington, 69 Gracefield Rd, Lower Hutt 5040, New Zealand
| | - Dorian Schmidt
- Institute of Pharmacy, Christian-Albrechts-University of Kiel, Gutenbergstraße 76, D-24116 Kiel, Germany
| | - Scott A Cameron
- Ferrier Research Institute, Victoria University of Wellington, 69 Gracefield Rd, Lower Hutt 5040, New Zealand
| | - Parry J Guilford
- Cancer Genetics Laboratory, Department of Biochemistry, University of Otago, 710 Cumberland Street, Dunedin 9016, New Zealand
| | - Gary B Evans
- Ferrier Research Institute, Victoria University of Wellington, 69 Gracefield Rd, Lower Hutt 5040, New Zealand
| |
Collapse
|
6
|
Vishe M, Johnston JN. The inverted ketene synthon: a double umpolung approach to enantioselective β 2,3-amino amide synthesis. Chem Sci 2019; 10:1138-1143. [PMID: 30774911 PMCID: PMC6349014 DOI: 10.1039/c8sc04330b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Accepted: 11/11/2018] [Indexed: 12/29/2022] Open
Abstract
A stereocontrolled synthesis of β2,3-amino amides is reported. Innovation is encapsulated by the first use of nitroalkenes to achieve double umpolung in enantioselective β-amino amide synthesis. Step economy is also fulfilled by the use of Umpolung Amide Synthesis (UmAS) in the second step, delivering the amide product without intermediacy of a carboxylic acid or activated derivative. Molybdenum oxide-mediated hydride reduction provides the anti-β2,3-amino amide with high selectivity.
Collapse
Affiliation(s)
- Mahesh Vishe
- Department of Chemistry , Vanderbilt Institute of Chemical Biology Vanderbilt University , Nashville , Tennessee 37235 , USA .
| | - Jeffrey N Johnston
- Department of Chemistry , Vanderbilt Institute of Chemical Biology Vanderbilt University , Nashville , Tennessee 37235 , USA .
| |
Collapse
|
7
|
Sprague DJ, Singh A, Johnston JN. Diastereo- and enantioselective additions of α-nitro esters to imines for anti-α,β-diamino acid synthesis with α-alkyl-substitution. Chem Sci 2018; 9:2336-2339. [PMID: 29719706 PMCID: PMC5903423 DOI: 10.1039/c7sc05176j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 01/23/2018] [Indexed: 11/30/2022] Open
Abstract
The discovery that a C2-symmetric bis(AMidine) [BAM] catalyst promotes an anti-selective addition of α-substituted α-nitro esters to imines is described, providing α-substituted α,β-diamino ester products with high diastereo- and enantioselectivity. When compared to the function of a BAM catalyst reported previously, the pair offer a rare example of diastereodivergence using a bifunctional Brønsted acid-base organocatalyst.
Collapse
Affiliation(s)
- Daniel J Sprague
- Department of Chemistry , Vanderbilt Institute of Chemical Biology , Vanderbilt University , Nashville , Tennessee 37235 , USA .
| | - Anand Singh
- Department of Chemistry , Vanderbilt Institute of Chemical Biology , Vanderbilt University , Nashville , Tennessee 37235 , USA .
| | - Jeffrey N Johnston
- Department of Chemistry , Vanderbilt Institute of Chemical Biology , Vanderbilt University , Nashville , Tennessee 37235 , USA .
| |
Collapse
|
8
|
Tsukanov SV, Johnson MD, May SA, Rosemeyer M, Watkins MA, Kolis SP, Yates MH, Johnston JN. Development of an Intermittent-Flow Enantioselective Aza-Henry Reaction Using an Arylnitromethane and Homogeneous Brønsted Acid-Base Catalyst with Recycle. Org Process Res Dev 2016; 20:215-226. [PMID: 27065720 PMCID: PMC4821467 DOI: 10.1021/acs.oprd.5b00245] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A stereoselective aza-Henry reaction between an arylnitromethane and Boc-protected aryl aldimine using a homogeneous Brønsted acid-base catalyst was translated from batch format to an automated intermittent-flow process. This work demonstrates the advantages of a novel intermittent-flow setup with product crystallization and slow reagent addition which is not amenable to the standard continuous equipment: plug flow tube reactor (PFR) or continuous stirred tank reactor (CSTR). A significant benefit of this strategy was the integration of an organocatalytic enantioselective reaction with straightforward product separation, including recycle of the catalyst, resulting in increased intensity of the process by maintaining high catalyst concentration in the reactor. A continuous campaign confirmed that these conditions could effectively provide high throughput of material using an automated system while maintaining high selectivity, thereby addressing nitroalkane safety and minimizing catalyst usage.
Collapse
Affiliation(s)
- Sergey V. Tsukanov
- Small Molecule Design and Development, Eli Lilly and Company, Indianapolis, Indiana 46285, Unites States
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Martin D. Johnson
- Small Molecule Design and Development, Eli Lilly and Company, Indianapolis, Indiana 46285, Unites States
| | - Scott A. May
- Small Molecule Design and Development, Eli Lilly and Company, Indianapolis, Indiana 46285, Unites States
| | - Morgan Rosemeyer
- Small Molecule Design and Development, Eli Lilly and Company, Indianapolis, Indiana 46285, Unites States
| | - Michael A. Watkins
- Small Molecule Design and Development, Eli Lilly and Company, Indianapolis, Indiana 46285, Unites States
| | - Stanley P. Kolis
- Small Molecule Design and Development, Eli Lilly and Company, Indianapolis, Indiana 46285, Unites States
| | - Matthew H. Yates
- Small Molecule Design and Development, Eli Lilly and Company, Indianapolis, Indiana 46285, Unites States
| | - Jeffrey N. Johnston
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| |
Collapse
|
9
|
Lim VT, Tsukanov SV, Stephens AB, Johnston JN. Enantioselective Synthesis of α-Bromonitroalkanes for Umpolung Amide Synthesis: Preparation of
tert
-Butyl ((1
R
)-1-(4-(benzyloxy)phenyl)-2-bromo-2-nitroethyl)carbamate. ORGANIC SYNTHESES; AN ANNUAL PUBLICATION OF SATISFACTORY METHODS FOR THE PREPARATION OF ORGANIC CHEMICALS 2016; 93:88-99. [PMID: 28579652 PMCID: PMC5453646 DOI: 10.15227/orgsyn.093.0088] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Victoria T Lim
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235
| | - Sergey V Tsukanov
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235
| | - Amanda B Stephens
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235
| | - Jeffrey N Johnston
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235
| |
Collapse
|
10
|
Podolan G, Jungk P, Lentz D, Zimmer R, Reissig HU. Studies on the Synthesis of Specifically Fluorinated 4-Amino- pyridine Derivatives by Regioselective Nucleophilic Aromatic Substitution and Catalytic Hydrodefluorination. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500393] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
11
|
Sprague D, Nugent BM, Yoder RA, Vara BA, Johnston JN. Adaptation of a small-molecule hydrogen-bond donor catalyst to an enantioselective hetero-Diels-Alder reaction hypothesized for brevianamide biosynthesis. Org Lett 2015; 17:880-3. [PMID: 25697748 PMCID: PMC4339957 DOI: 10.1021/ol503626w] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Indexed: 12/22/2022]
Abstract
Chiral diamine-derived hydrogen-bond donors were evaluated for their ability to effect stereocontrol in an intramolecular hetero-Diels-Alder (HDA) reaction hypothesized in the biosynthesis of brevianamides A and B. Collectively, these results provide proof of principle that small-molecule hydrogen-bond catalysis, if even based on a hypothetical biosynthesis construct, holds significant potential within enantioselective natural product synthesis.
Collapse
Affiliation(s)
- Daniel
J. Sprague
- Department of Chemistry and
Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Benjamin M. Nugent
- Department of Chemistry and
Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Ryan A. Yoder
- Department of Chemistry and
Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Brandon A. Vara
- Department of Chemistry and
Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Jeffrey N. Johnston
- Department of Chemistry and
Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| |
Collapse
|
12
|
Vara BA, Mayasundari A, Tellis JC, Danneman MW, Arredondo V, Davis TA, Min J, Finch K, Guy RK, Johnston JN. Organocatalytic, diastereo- and enantioselective synthesis of nonsymmetric cis-stilbene diamines: a platform for the preparation of single-enantiomer cis-imidazolines for protein-protein inhibition. J Org Chem 2014; 79:6913-38. [PMID: 25017623 PMCID: PMC4120989 DOI: 10.1021/jo501003r] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
![]()
The
finding by scientists at Hoffmann-La Roche that cis-imidazolines could disrupt the protein–protein interaction
between p53 and MDM2, thereby inducing apoptosis in cancer cells,
raised considerable interest in this scaffold over the past decade.
Initial routes to these small molecules (i.e., Nutlin-3) provided
only the racemic form, with enantiomers being enriched by chromatographic
separation using high-pressure liquid chromatography (HPLC) and a
chiral stationary phase. Reported here is the first application of
an enantioselective aza-Henry approach to nonsymmetric cis-stilbene diamines and cis-imidazolines. Two novel
mono(amidine) organocatalysts (MAM) were discovered to provide high
levels of enantioselection (>95% ee) across a broad range of substrate
combinations. Furthermore, the versatility of the aza-Henry strategy
for preparing nonsymmetric cis-imidazolines is illustrated
by a comparison of the roles of aryl nitromethane and aryl aldimine
in the key step, which revealed unique substrate electronic effects
providing direction for aza-Henry substrate–catalyst matching.
This method was used to prepare highly substituted cis-4,5-diaryl imidazolines that project unique aromatic rings, and
these were evaluated for MDM2-p53 inhibition in a fluorescence polarization
assay. The diversification of access to cis-stilbene
diamine-derived imidazolines provided by this platform should streamline
their further development as chemical tools for disrupting protein–protein
interactions.
Collapse
Affiliation(s)
- Brandon A Vara
- Department of Chemistry & Vanderbilt Institute of Chemical Biology, Vanderbilt University , 7330 Stevenson Center, Nashville, Tennessee 37235, United States
| | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Davis TA, Vilgelm AE, Richmond A, Johnston JN. Preparation of (-)-Nutlin-3 using enantioselective organocatalysis at decagram scale. J Org Chem 2013; 78:10605-16. [PMID: 24127627 DOI: 10.1021/jo401321a] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Chiral nonracemic cis-4,5-bis(aryl)imidazolines have emerged as a powerful platform for the development of cancer chemotherapeutics, stimulated by the Hoffmann-La Roche discovery that Nutlin-3 can restore apoptosis in cells with wild-type p53. The lack of efficient methods for the enantioselective synthesis of cis-imidazolines, however, has limited their more general use. Our disclosure of the first enantioselective synthesis of (-)-Nutlin-3 provided a basis to prepare larger amounts of this tool used widely in cancer biology. Key to the decagram-scale synthesis described here was the discovery of a novel bis(amidine) organocatalyst that provides high enantioselectivity at warmer reaction temperature (-20 °C) and low catalyst loadings. Further refinements to the procedure led to the synthesis of (-)-Nutlin-3 in a 17 g batch and elimination of all but three chromatographic purifications.
Collapse
Affiliation(s)
- Tyler A Davis
- Department of Chemistry & Vanderbilt Institute of Chemical Biology, Vanderbilt University , Nashville, Tennessee 37235-1822, United States
| | | | | | | |
Collapse
|
14
|
Isik M, Tanyeli C. Cu-catalyzed selective mono-N-pyridylation: direct access to 2-aminoDMAP/sulfonamides as bifunctional organocatalysts. J Org Chem 2013; 78:1604-11. [PMID: 23331280 DOI: 10.1021/jo302713b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Direct and selective mono-N-pyridylation of trans-(R,R)-cyclohexane-1,2-diamine is described here. Facile preparation of a novel chiral 2-aminoDMAP core catalaphore via Cu catalysis has led to the development of various sulfonamide/2-aminoDMAPs as bifunctional acid/base organocatalysts (most in two steps overall), which have been shown to very effectively promote asymmetric conjugate addition of acetylacetone to trans-β-nitroolefins with good to excellent yields (87-93%) and enantioselectivites (up to 99%).
Collapse
Affiliation(s)
- Murat Isik
- Department of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
| | | |
Collapse
|
15
|
Dobish MC, Villalta F, Waterman MR, Lepesheva GI, Johnston JN. Organocatalytic, enantioselective synthesis of VNI: a robust therapeutic development platform for Chagas, a neglected tropical disease. Org Lett 2012; 14:6322-5. [PMID: 23214987 DOI: 10.1021/ol303092v] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
VNI is a potent inhibitor of CYP51 and was recently shown to achieve a parasitological cure of mice infected with T. cruzi in both acute and chronic stages of infection. T. cruzi is the causative parasite of Chagas disease, a neglected tropical disease. The first enantioselective chemical synthesis of VNI (at a materials cost of less than $0.10/mg) is described. Furthermore, the key enantioselective step is performed at the 10 g scale.
Collapse
Affiliation(s)
- Mark C Dobish
- Department of Chemistry & Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | | | | | | | | |
Collapse
|
16
|
Davis TA, Danneman MW, Johnston JN. Chiral proton catalysis of secondary nitroalkane additions to azomethine: synthesis of a potent GlyT1 inhibitor. Chem Commun (Camb) 2012; 48:5578-80. [PMID: 22543734 DOI: 10.1039/c2cc32225k] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The first enantioselective synthesis of a potent GlyT1 inhibitor is described. A 3-nitroazetidine donor is used in an enantioselective aza-Henry reaction catalyzed by a bis(amidine)-triflic acid salt organocatalyst, delivering the key intermediate with 92% ee. This adduct is reductively denitrated and converted to the target through a short sequence, thereby allowing assignment of the absolute configuration of the more potent enantiomer.
Collapse
Affiliation(s)
- Tyler A Davis
- Department of Chemistry & Vanderbilt Institute of Chemical Biology Vanderbilt University, Nashville, TN 37235-1822, USA
| | | | | |
Collapse
|
17
|
Dobish MC, Johnston JN. Achiral counterion control of enantioselectivity in a Brønsted acid-catalyzed iodolactonization. J Am Chem Soc 2012; 134:6068-71. [PMID: 22463391 DOI: 10.1021/ja301858r] [Citation(s) in RCA: 171] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Highly enantioselective halolactonizations have been developed that employ a chiral proton catalyst-N-iodosuccinimide (NIS) reagent system in which the Brønsted acid is used at catalyst loadings as low as 1 mol %. An approach that modulates the achiral counterion (equimolar to the neutral chiral ligand-proton complex present at low catalyst loadings) to optimize the enantioselection is documented for the first time in this transformation. In this way, unsaturated carboxylic acids are converted to γ-lactones in high yields (up to 98% ee) using commercially available NIS.
Collapse
Affiliation(s)
- Mark C Dobish
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, USA
| | | |
Collapse
|