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Design, synthesis, and structure – Activity relationship studies of novel tryptamine derivatives as 5‑HT1B receptor agonists. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Meanwell NA, Loiseleur O. Applications of Isosteres of Piperazine in the Design of Biologically Active Compounds: Part 2. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:10972-11004. [PMID: 35675052 DOI: 10.1021/acs.jafc.2c00729] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Applications of piperazine and homopiperazine in drug design are well-established, and these heterocycles have found use as both scaffolding and terminal elements and also as a means of introducing a water-solubilizing element into a molecule. In the accompanying review (10.1021/acs.jafc.2c00726), we summarized applications of piperazine and homopiperazine and their fused ring homologues in bioactive compound design along with illustrations of the use of 4-substituted piperidines and a sulfoximine-based mimetic. In this review, we discuss applications of pyrrolidine- and fused-pyrrolidine-based mimetics of piperazine and homopiperazine and illustrate derivatives of azetidine that include stretched and spirocyclic motifs, along with applications of a series of diaminocycloalkanes.
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Affiliation(s)
- Nicholas A Meanwell
- Small Molecule Drug Discovery, Bristol Myers Squibb Research and Early Development, Post Office Box 4000, Princeton, New Jersey 08543, United States
| | - Olivier Loiseleur
- Syngenta Crop Protection Research, Schaffhauserstrasse, CH-4332 Stein, Switzerland
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Zaręba P, Śliwa P, Satała G, Zajdel P, Latacz G, Jaśkowska J. New N-aryl-N′-aryl-/(thio)ureido-/sulfamoylamino-derivatives of alkyl/alkylcarbamoyl piperazines: Effect of structural modifications on selectivity over 5-HT1A receptor. Eur J Med Chem 2022; 235:114319. [DOI: 10.1016/j.ejmech.2022.114319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 03/12/2022] [Accepted: 03/23/2022] [Indexed: 11/30/2022]
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Staroń J, Bugno R, Pietruś W, Satała G, Mordalski S, Warszycki D, Hogendorf A, Hogendorf AS, Kalinowska-Tłuścik J, Lenda T, Pilarski B, Bojarski AJ. Rationally designed N-phenylsulfonylindoles as a tool for the analysis of the non-basic 5-HT 6R ligands binding mode. Eur J Med Chem 2020; 209:112916. [PMID: 33328102 DOI: 10.1016/j.ejmech.2020.112916] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 09/17/2020] [Accepted: 10/05/2020] [Indexed: 10/23/2022]
Abstract
Among all of the monoaminergic receptors, the 5-HT6R has the highest number of non-basic ligands (approximately 5% of compounds stored in 25th version of ChEMBL database have the strongest basic pKa below 5, calculated using the Instant JChem calculator plugin). These compounds, when devoid of a basic nitrogen, exhibit high affinity and remarkable selectivity. Despite a decade of research, no clues have been given for explanation of such an intriguing phenomenon. Here, a series of analogs of four known 5-HT6R ligands, has been rationally designed to approach this issue. For each of the synthesized 42 compounds, a binding affinity for 5-HT6R has been measured, together with a selectivity profile against 5-HT1AR, 5-HT2AR, 5-HT7R and D2R. Performed induced fit docking and molecular dynamics experiments revealed that no particular interaction was responsible for the activity of non-basic compounds. In fact, a plain N-phenylsulfonylindole (1e) was found to possess a moderate (5-HT6R, Ki = 159 nM) affinity. No other monoaminergic receptor has as simple and selective ligand as this one. Thus, it is stated that it binds to the receptor solely based on its conformation and as such, possesses a minimum amount of features, required for binding. Also, any functional group able to form an additional interaction with the receptor increase the binding affinity, like in the case of two highly active non-basic compounds 3e and 5g (5-HT6R, Ki = 65 nM and 38 nM, respectively).
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Affiliation(s)
- Jakub Staroń
- Maj Institute of Pharmacology, Polish Academy of Sciences, 31-343, Kraków, 12 Smętna Street, Poland.
| | - Ryszard Bugno
- Maj Institute of Pharmacology, Polish Academy of Sciences, 31-343, Kraków, 12 Smętna Street, Poland
| | - Wojciech Pietruś
- Maj Institute of Pharmacology, Polish Academy of Sciences, 31-343, Kraków, 12 Smętna Street, Poland
| | - Grzegorz Satała
- Maj Institute of Pharmacology, Polish Academy of Sciences, 31-343, Kraków, 12 Smętna Street, Poland
| | - Stefan Mordalski
- Maj Institute of Pharmacology, Polish Academy of Sciences, 31-343, Kraków, 12 Smętna Street, Poland
| | - Dawid Warszycki
- Maj Institute of Pharmacology, Polish Academy of Sciences, 31-343, Kraków, 12 Smętna Street, Poland
| | - Agata Hogendorf
- Maj Institute of Pharmacology, Polish Academy of Sciences, 31-343, Kraków, 12 Smętna Street, Poland
| | - Adam S Hogendorf
- Maj Institute of Pharmacology, Polish Academy of Sciences, 31-343, Kraków, 12 Smętna Street, Poland
| | - Justyna Kalinowska-Tłuścik
- Department of Crystal Chemistry and Crystal Physic Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland
| | - Tomasz Lenda
- Maj Institute of Pharmacology, Polish Academy of Sciences, 31-343, Kraków, 12 Smętna Street, Poland
| | | | - Andrzej J Bojarski
- Maj Institute of Pharmacology, Polish Academy of Sciences, 31-343, Kraków, 12 Smętna Street, Poland
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Modica MN, Lacivita E, Intagliata S, Salerno L, Romeo G, Pittalà V, Leopoldo M. Structure-Activity Relationships and Therapeutic Potentials of 5-HT 7 Receptor Ligands: An Update. J Med Chem 2018; 61:8475-8503. [PMID: 29767995 DOI: 10.1021/acs.jmedchem.7b01898] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Serotonin 5-HT7 receptor (5-HT7R) has been the subject of intense research efforts because of its presence in brain areas such as the hippocampus, hypothalamus, and cortex. Preclinical data link the 5-HT7R to a variety of central nervous system processes including the regulation of circadian rhythms, mood, cognition, pain processing, and mechanisms of addiction. 5-HT7R blockade has antidepressant effects and may ameliorate cognitive deficits associated with schizophrenia. 5-HT7R has been recently shown to modulate neuronal morphology, excitability, and plasticity, thus contributing to shape brain networks during development and to remodel neuronal wiring in the mature brain. Therefore, the activation of 5-HT7R has been proposed as a therapeutic approach for neurodevelopmental and neuropsychiatric disorders associated with abnormal neuronal connectivity. This Perspective celebrates the silver jubilee of the discovery of 5-HT7R by providing a survey of recent studies on the medicinal chemistry of 5-HT7R ligands and on the neuropharmacology of 5-HT7R.
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Affiliation(s)
- Maria N Modica
- Dipartimento di Scienze del Farmaco , Università di Catania , Viale Andrea Doria 6 , 95125 Catania , Italy
| | - Enza Lacivita
- Dipartimento di Farmacia-Scienze del Farmaco , Università degli Studi di Bari Aldo Moro , Via Orabona 4 , 70125 Bari , Italy
| | - Sebastiano Intagliata
- Department of Medicinal Chemistry, College of Pharmacy , University of Florida , Medical Science Building, 1345 Center Drive , Gainesville , Florida 32610 , United States
| | - Loredana Salerno
- Dipartimento di Scienze del Farmaco , Università di Catania , Viale Andrea Doria 6 , 95125 Catania , Italy
| | - Giuseppe Romeo
- Dipartimento di Scienze del Farmaco , Università di Catania , Viale Andrea Doria 6 , 95125 Catania , Italy
| | - Valeria Pittalà
- Dipartimento di Scienze del Farmaco , Università di Catania , Viale Andrea Doria 6 , 95125 Catania , Italy
| | - Marcello Leopoldo
- Dipartimento di Farmacia-Scienze del Farmaco , Università degli Studi di Bari Aldo Moro , Via Orabona 4 , 70125 Bari , Italy
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Ling T, Lang W, Feng X, Das S, Maier J, Jeffries C, Shelat A, Rivas F. Novel vitexin-inspired scaffold against leukemia. Eur J Med Chem 2018; 146:501-510. [PMID: 29407975 DOI: 10.1016/j.ejmech.2018.01.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 12/04/2017] [Accepted: 01/01/2018] [Indexed: 10/18/2022]
Abstract
Acute lymphoblastic leukemia (ALL) is the most common type of leukemia in children. Up to a quarter of ALL patients relapse and face poor prognosis. To identify new compound leads, we conducted a phenotypic screen using terrestrial natural product (NP) fractions against immortalized ALL cellular models. We identified vitexin, a flavonoid, as a promising hit with biological activity (EC50 = 30 μM) in pre-B cell ALL models with no toxicity against normal human tissue (BJ cells) at the tested concentrations. To develop more potent compounds against ALL and elucidate its potential mode of action, a vitexin-inspired compound library was synthesized. Thus, we developed an improved and scalable protocol for the direct synthesis of 4-quinolone core heterocycles containing an N-sulfonamide using a one-pot condensation reaction protocol. The newly generated compounds represent a novel molecular scaffold against ALL as exemplified by compounds 13 and 15, which demonstrated EC50 values in the low micromolar range (0.3-10 μM) with little to no toxicity in normal cellular models. Computational studies support the hypothesis that these compounds are potential CDK inhibitors. The compounds induced apoptosis, caused cell arrest at G0/G1 and G2/M, and induced ROS in cancer cells.
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Affiliation(s)
- Taotao Ling
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Walter Lang
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Xiang Feng
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Sourav Das
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Julie Maier
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Cynthia Jeffries
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Anang Shelat
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Fatima Rivas
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA.
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Low-basicity 5-HT 7 Receptor Agonists Synthesized Using the van Leusen Multicomponent Protocol. Sci Rep 2017; 7:1444. [PMID: 28473721 PMCID: PMC5431432 DOI: 10.1038/s41598-017-00822-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 03/14/2017] [Indexed: 12/12/2022] Open
Abstract
A series of 5-aryl-1-alkylimidazole derivatives was synthesized using the van Leusen multicomponent reaction. The chemotype is the first example of low-basicity scaffolds exhibiting high affinity for 5-HT7 receptor together with agonist function. The chosen lead compounds 3-(1-ethyl-1H-imidazol-5-yl)-5-iodo-1H-indole (AGH-107, 1o, Ki 5-HT7 = 6 nM, EC50 = 19 nM, 176-fold selectivity over 5-HT1AR) and 1e (5-methoxy analogue, Ki 5-HT7 = 30 nM, EC50 = 60 nM) exhibited high selectivity over related CNS targets, high metabolic stability and low toxicity in HEK-293 and HepG2 cell cultures. A rapid absorption to the blood, high blood-brain barrier permeation and a very high peak concentration in the brain (Cmax = 2723 ng/g) were found for 1o after i.p. (5 mg/kg) administration in mice. The compound was found active in novel object recognition test in mice, at 0.5, 1 and 5 mg/kg. Docking to 5-HT7R homology models indicated a plausible binding mode which explain the unusually high selectivity over the related CNS targets. Halogen bond formation between the most potent derivatives and the receptor is consistent with both the docking results and SAR. 5-Chlorine, bromine and iodine substitution resulted in a 13, 27 and 89-fold increase in binding affinities, respectively, and in enhanced 5-HT1AR selectivity.
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Abstract
INTRODUCTION A high-quality drug must achieve a balance of physicochemical and absorption, distribution, metabolism and elimination properties, safety and potency against its therapeutic target(s). Multiparameter optimization (MPO) methods guide the simultaneous optimization of multiple factors to quickly target compounds with the highest chance of downstream success. MPO can be combined with 'de novo design' methods to automatically generate and assess a large number of diverse structures and identify strategies to optimize a compound's overall balance of properties. AREAS COVERED The article provides a review of MPO methods and recent developments in the methods and opinions in the field. It also provides a description of advances in de novo design that improve the relevance of automatically generated compound structures and integrate MPO. Finally, the article provides discussion of a recent case study of the automatic design of ligands to polypharmacological profiles. EXPERT OPINION Recent developments have reduced the generation of chemically infeasible structures and improved the quality of compounds generated by de novo design methods. There are concerns about the ability of simple drug-like properties and ligand efficiency indices to effectively guide the detailed optimization of compounds. De novo design methods cannot identify a perfect compound for synthesis, but it can identify high-quality ideas for detailed consideration by an expert scientist.
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Affiliation(s)
- Matthew Segall
- Optibrium Ltd , 7221 Cambridge Research Park, Beach Drive, Cambridge, CB25 9TL , UK +44 1223 815902 ; +44 1223 815907 ;
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9
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Drug-Induced Phospholipidosis: Prediction, Detection, and Mitigation Strategies. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/7355_2013_34] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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Zheng J, Deng L, Chen M, Xiao X, Xiao S, Guo C, Xiao G, Bai L, Ye W, Zhang D, Chen H. Elaboration of thorough simplified vinca alkaloids as antimitotic agents based on pharmacophore similarity. Eur J Med Chem 2013; 65:158-67. [PMID: 23708010 DOI: 10.1016/j.ejmech.2013.04.057] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2013] [Revised: 04/24/2013] [Accepted: 04/25/2013] [Indexed: 10/26/2022]
Abstract
Thorough simplification of vinca alkaloids based on pharmacophore similarity has been conducted. A concise process for the syntheses of target compounds was successfully developed with yields from poor to excellent (19-98%). Cell growth inhibitory activities of these synthesized compounds were evaluated in five cancer cell lines including MCF-7, MDA-MB-231, HepG2, HepG2/ADM and K562. Almost all compounds exhibited moderate antitumor activity with optimal IC50 value of 0.89 ± 0.07 μM in MCF-7 cells. Investigation of structure-activity relationship (SAR) indicates that electron-withdraw substituents on the ring contribute to the enhancement of the antitumor activities. The simplified vinca alkaloids are confirmed as antimitotic agents, which inhibit the polymerization of tubulin just like vinblastine.
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Affiliation(s)
- Jing Zheng
- Institute of Traditional Chinese Medicine and Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632, PR China
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Neo AG, Díaz J, Marcaccini S, Marcos CF. Conjugate addition of isocyanides to chromone 3-carboxylic acid: an efficient one-pot synthesis of chroman-4-one 2-carboxamides. Org Biomol Chem 2012; 10:3406-16. [PMID: 22434156 DOI: 10.1039/c2ob07011a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We report a novel Lewis acid catalysed tandem reaction of isocyanides, chromone 3-carboxylic acid and nucleophiles. An experimentally very simple procedure, involving the use of microwave irradiation in the presence of a Lewis acid catalyst, affords a representative collection of chromone-2-carboxamides and chromone-2-carboxamido-3-esters in high yields, in just a few minutes. Such an unprecedented strategy is formally equivalent to a conjugate addition of isocyanides to Michael acceptors.
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Affiliation(s)
- Ana G Neo
- Laboratorio de Química Orgánica y Bioorgánica, Dept Química Orgánica e Inorgánica, Facultad de Veterinaria, Universidad de Extremadura, 10071 Cáceres, Spain
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12
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Sheng C, Zhang W. Fragment Informatics and Computational Fragment-Based Drug Design: An Overview and Update. Med Res Rev 2012; 33:554-98. [DOI: 10.1002/med.21255] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Chunquan Sheng
- Department of Medicinal Chemistry; School of Pharmacy; Second Military Medical University; 325 Guohe Road Shanghai 200433 People's Republic of China
| | - Wannian Zhang
- Department of Medicinal Chemistry; School of Pharmacy; Second Military Medical University; 325 Guohe Road Shanghai 200433 People's Republic of China
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14
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Irfan M, Glasnov TN, Kappe CO. Heterogeneous catalytic hydrogenation reactions in continuous-flow reactors. CHEMSUSCHEM 2011; 4:300-16. [PMID: 21337528 DOI: 10.1002/cssc.201000354] [Citation(s) in RCA: 205] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Indexed: 05/15/2023]
Abstract
Microreactor technology and continuous flow processing in general are key features in making organic synthesis both more economical and environmentally friendly. Heterogeneous catalytic hydrogenation reactions under continuous flow conditions offer significant benefits compared to batch processes which are related to the unique gas-liquid-solid triphasic reaction conditions present in these transformations. In this review article recent developments in continuous flow heterogeneous catalytic hydrogenation reactions using molecular hydrogen are summarized. Available flow hydrogenation techniques, reactors, commonly used catalysts and examples of synthetic applications with an emphasis on laboratory-scale flow hydrogenation reactions are presented.
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Affiliation(s)
- Muhammad Irfan
- Christian Doppler Laboratory for Microwave Chemistry and Institute of Chemistry, Karl Franzens University Graz, Heinrichstrasse 28, 8010 Graz, Austria
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Luo X, Krumrine JR, Shenvi AB, Pierson ME, Bernstein PR. Calculation and application of activity discriminants in lead optimization. J Mol Graph Model 2010; 29:372-81. [PMID: 20800520 DOI: 10.1016/j.jmgm.2010.07.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2010] [Revised: 07/10/2010] [Accepted: 07/14/2010] [Indexed: 11/18/2022]
Abstract
We present a technique for computing activity discriminants of in vitro (pharmacological, DMPK, and safety) assays and the application to the prediction of in vitro activities of proposed synthetic targets during the lead optimization phase of drug discovery projects. This technique emulates how medicinal chemists perform SAR analysis and activity prediction. The activity discriminants that are functions of 6 commonly used medicinal chemistry descriptors can be interpreted easily by medicinal chemists. Further, visualization with Spotfire allows medicinal chemists to analyze how the query molecule is related to compounds tested previously, and to evaluate easily the relevance of the activity discriminants to the activities of the query molecule. Validation with all compounds synthesized and tested in AstraZeneca Wilmington since 2006 demonstrates that this approach is useful for prioritizing new synthetic targets for synthesis.
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Affiliation(s)
- Xincai Luo
- Department of Chemistry, AstraZeneca Pharmaceuticals, 1800 Concord Pike, Wilmington, DE 19850, USA.
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Kutchukian PS, Shakhnovich EI. De novo design: balancing novelty and confined chemical space. Expert Opin Drug Discov 2010; 5:789-812. [PMID: 22827800 DOI: 10.1517/17460441.2010.497534] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
IMPORTANCE OF THE FIELD De novo drug design serves as a tool for the discovery of new ligands for macromolecular targets as well as optimization of known ligands. Recently developed tools aim to address the multi-objective nature of drug design in an unprecedented manner. AREAS COVERED IN THIS REVIEW This article discusses recent advances in de novo drug design programs and accessory programs used to evaluate compounds post-generation. WHAT THE READER WILL GAIN The reader is introduced to the challenges inherent in de novo drug design and will become familiar with current trends in de novo design. Furthermore, the reader will be better prepared to assess the value of a tool, and be equipped to design more elegant tools in the future. TAKE HOME MESSAGE De novo drug design can assist in the efficient discovery of new compounds with a high affinity for a given target. The inclusion of existing chemoinformatic methods with current structure-based de novo design tools provides a means of enhancing the therapeutic value of these generated compounds.
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Affiliation(s)
- Peter S Kutchukian
- Harvard University, Chemistry and Chemical Biology Department, 12 Oxford Street, Cambridge, MA 02138, USA
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Damewood JR, Lerman CL, Masek BB. NovoFLAP: A Ligand-Based De Novo Design Approach for the Generation of Medicinally Relevant Ideas. J Chem Inf Model 2010; 50:1296-303. [DOI: 10.1021/ci100080r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James R. Damewood
- Department of Chemistry, AstraZeneca Pharmaceuticals, 1800 Concord Pike, Wilmington, Delaware 19850 and Tripos, Inc., 1699 South Hanley Road, St. Louis, Missouri 63144
| | - Charles L. Lerman
- Department of Chemistry, AstraZeneca Pharmaceuticals, 1800 Concord Pike, Wilmington, Delaware 19850 and Tripos, Inc., 1699 South Hanley Road, St. Louis, Missouri 63144
| | - Brian B. Masek
- Department of Chemistry, AstraZeneca Pharmaceuticals, 1800 Concord Pike, Wilmington, Delaware 19850 and Tripos, Inc., 1699 South Hanley Road, St. Louis, Missouri 63144
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