1
|
Ribeiro JLS, Soares JCAV, Portapilla GB, Providello MV, Lima CHS, Muri EMF, de Albuquerque S, Dias LRS. Trypanocidal activity of new 1,6-diphenyl-1H-pyrazolo[3,4-b]pyridine derivatives: Synthesis, in vitro and in vivo studies. Bioorg Med Chem 2020; 29:115855. [PMID: 33199200 DOI: 10.1016/j.bmc.2020.115855] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 10/15/2020] [Accepted: 11/01/2020] [Indexed: 11/16/2022]
Abstract
Despite the serious public health problems caused by Chagas disease in several countries, the available therapy remains with only two drugs that are poorly active during the chronic phase of the disease in addition to having severe side effects. In search of new trypanocidal agents, herein we describe the synthesis and biological evaluation of eleven new 1,6-diphenyl-1H-pyrazolo[3,4-b]pyridine compounds containing the carbohydrazide or the 2,3-dihydro-1,3,4-oxadiazole moieties. Two of them showed promising in vitro activity against amastigote forms of T. cruzi and were evaluated in vivo in male BALB/c mice infected with T. cruzi Y strain. Our results suggest that the substitution at the C-2 position of the phenyl group connected to the carbohydrazide or to the 2,3-dihydro-1,3,4-oxadiazole moieties plays an important role in the trypanocidal activity of this class of compounds. Moreover, the compound containing the 2,3-dihydro-1,3,4-oxadiazole moiety has demonstrated more favorable structural requirements for in vivo activity than its carbohydrazide analog.
Collapse
Affiliation(s)
- Joana L S Ribeiro
- Universidade Federal Fluminense, Faculdade de Farmácia, Laboratório de Química Medicinal, RJ, Brazil
| | - Júlio C A V Soares
- Universidade Federal Fluminense, Faculdade de Farmácia, Laboratório de Química Medicinal, RJ, Brazil
| | - Gisele B Portapilla
- Universidade de São Paulo, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, SP, Brazil
| | - Maiara V Providello
- Universidade de São Paulo, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, SP, Brazil
| | - Camilo H S Lima
- Universidade Federal do Rio de Janeiro, Instituto de Química, RJ, Brazil
| | - Estela M F Muri
- Universidade Federal Fluminense, Faculdade de Farmácia, Laboratório de Química Medicinal, RJ, Brazil
| | - Sérgio de Albuquerque
- Universidade de São Paulo, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, SP, Brazil.
| | - Luiza R S Dias
- Universidade Federal Fluminense, Faculdade de Farmácia, Laboratório de Química Medicinal, RJ, Brazil.
| |
Collapse
|
2
|
Adib M, Peytam F. An efficient synthesis of fully substituted pyrazolo[3,4-b]pyridin-5-amines from α-azidochalcones. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.03.036] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
3
|
Chao WC, Shen JY, Yang CH, Lan YK, Yuan JH, Lin LJ, Yang HC, Lu JF, Wang JS, Wee K, Chen YH, Chou PT. The In Situ Tryptophan Analogue Probes the Conformational Dynamics in Asparaginase Isozymes. Biophys J 2017; 110:1732-1743. [PMID: 27119634 DOI: 10.1016/j.bpj.2016.03.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 03/10/2016] [Accepted: 03/21/2016] [Indexed: 11/19/2022] Open
Abstract
Dynamic water solvation is crucial to protein conformational reorganization and hence to protein structure and functionality. We report here the characterization of water dynamics on the L-asparaginase structural homology isozymes L-asparaginases I (AnsA) and II (AnsB), which are shown via fluorescence spectroscopy and dynamics in combination with molecular dynamics simulation to have distinct catalytic activity. By use of the tryptophan (Trp) analog probe 2,7-diaza-tryptophan ((2,7-aza)Trp), which exhibits unique water-catalyzed proton-transfer properties, AnsA and AnsB are shown to have drastically different local water environments surrounding the single Trp. In AnsA, (2,7-aza)Trp exhibits prominent green N(7)-H emission resulting from water-catalyzed excited-state proton transfer. In stark contrast, the N(7)-H emission is virtually absent in AnsB, which supports a water-accessible and a water-scant environment in the proximity of Trp for AnsA and AnsB, respectively. In addition, careful analysis of the emission spectra and corresponding relaxation dynamics, together with the results of molecular dynamics simulations, led us to propose two structural states associated with the rearrangement of the hydrogen-bond network in the vicinity of Trp for the two Ans. The water molecules revealed in the proximity of the Trp residue have semiquantitative correlation with the observed emission spectral variations of (2,7-aza)Trp between AnsA and AnsB. Titration of aspartate, a competitive inhibitor of Ans, revealed an increase in N(7)-H emission intensity in AnsA but no obvious spectral changes in AnsB. The changes in the emission profiles reflect the modulation of structural states by locally confined environment and trapped-water collective motions.
Collapse
Affiliation(s)
- Wei-Chih Chao
- Department of Chemistry, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Jiun-Yi Shen
- Department of Chemistry and Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei, Taiwan
| | - Cheng-Han Yang
- Department of Chemistry, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Yi-Kang Lan
- Department of Chemistry, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Jui-Hung Yuan
- Department of Chemistry and Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei, Taiwan
| | - Li-Ju Lin
- School of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Hsiao-Ching Yang
- Department of Chemistry, Fu Jen Catholic University, New Taipei City, Taiwan.
| | - Jyh-Feng Lu
- School of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Jinn-Shyan Wang
- School of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Kevin Wee
- Department of Chemistry and Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei, Taiwan
| | - You-Hua Chen
- Department of Chemistry and Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei, Taiwan
| | - Pi-Tai Chou
- Department of Chemistry and Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei, Taiwan.
| |
Collapse
|
4
|
ElMarrouni A, Campbell M, Perkins JJ, Converso A. Development of a sp2–sp3 Stille Cross-Coupling for Rapid Synthesis of HIV NNRTI Doravirine Analogues. Org Lett 2017; 19:3071-3074. [PMID: 28589720 DOI: 10.1021/acs.orglett.7b01142] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Abdellatif ElMarrouni
- Department of Discovery Chemistry, MRL, Merck & Co., Inc., 770 Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Mark Campbell
- Department of Discovery Chemistry, MRL, Merck & Co., Inc., 770 Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - James J. Perkins
- Department of Discovery Chemistry, MRL, Merck & Co., Inc., 770 Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Antonella Converso
- Department of Discovery Chemistry, MRL, Merck & Co., Inc., 770 Sumneytown Pike, West Point, Pennsylvania 19486, United States
| |
Collapse
|
5
|
Algera RF, Gupta L, Hoepker AC, Liang J, Ma Y, Singh KJ, Collum DB. Lithium Diisopropylamide: Nonequilibrium Kinetics and Lessons Learned about Rate Limitation. J Org Chem 2017; 82:4513-4532. [PMID: 28368117 PMCID: PMC6059656 DOI: 10.1021/acs.joc.6b03083] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The kinetics of lithium diisopropylamide (LDA) in tetrahydrofuran under nonequilibrium conditions are reviewed. These conditions correspond to a class of substrates in which the rates of LDA aggregation and solvation events are comparable to the rates at which various fleeting intermediates react with substrate. Substrates displaying these reactivities, by coincidence, happen to be those that react at tractable rates on laboratory time scales at -78 °C. In this strange region of nonlimiting behavior, rate-limiting steps are often poorly defined, sometimes involve deaggregation, and at other times include reaction with substrate. Changes in conditions routinely cause shifts in the rate-limiting steps, and autocatalysis is prevalent and can be acute. The studies are described in three distinct portions: (1) methods and strategies used to deconvolute complex reaction pathways, (2) the resulting conclusions about organolithium reaction mechanisms, and (3) perspectives on the concept of rate limitation reinforced by studies of LDA in tetrahydrofuran at -78 °C under nonequilibrium conditions.
Collapse
Affiliation(s)
- Russell F. Algera
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853–1301
| | - Lekha Gupta
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853–1301
| | - Alexander C. Hoepker
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853–1301
| | - Jun Liang
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853–1301
| | - Yun Ma
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853–1301
| | - Kanwal J. Singh
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853–1301
| | - David B. Collum
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853–1301
| |
Collapse
|
6
|
|
7
|
Gupta L, Hoepker AC, Ma Y, Viciu MS, Faggin MF, Collum DB. Lithium diisopropylamide-mediated ortholithiation of 2-fluoropyridines: rates, mechanisms, and the role of autocatalysis. J Org Chem 2013; 78:4214-30. [PMID: 23270408 DOI: 10.1021/jo302408r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Lithium diisopropylamide (LDA)-mediated ortholithiations of 2-fluoropyridine and 2,6-difluoropyridine in tetrahydrofuran at -78 °C were studied using a combination of IR and NMR spectroscopic and computational methods. Rate studies show that a substrate-assisted deaggregation of LDA dimer occurs parallel to an unprecedented tetramer-based pathway. Standard and competitive isotope effects confirm post-rate-limiting proton transfer. Autocatalysis stems from ArLi-catalyzed deaggregation of LDA proceeding via 2:2 LDA-ArLi mixed tetramers. A hypersensitivity of the ortholithiation rates to traces of LiCl derives from LiCl-catalyzed LDA dimer-monomer exchange and a subsequent monomer-based ortholithiation. Fleeting 2:2 LDA-LiCl mixed tetramers are suggested to be key intermediates. The mechanisms of both the uncatalyzed and catalyzed deaggregations are discussed. A general mechanistic paradigm is delineated to explain a number of seemingly disparate LDA-mediated reactions, all of which occur in tetrahydrofuran at -78 °C.
Collapse
Affiliation(s)
- Lekha Gupta
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
| | | | | | | | | | | |
Collapse
|
8
|
Goodyear A, Linghu X, Bishop B, Chen C, Cleator E, McLaughlin M, Sheen FJ, Stewart GW, Xu Y, Yin. J. Process Development and Large-Scale Synthesis of MK-6186, a Non-Nucleoside Reverse Transcriptase Inhibitor for the Treatment of HIV. Org Process Res Dev 2012. [DOI: 10.1021/op200334x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adrian Goodyear
- Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire,
EN11 9BU, U.K
| | - Xin Linghu
- Global Process
Chemistry, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065, United States
| | - Brian Bishop
- Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire,
EN11 9BU, U.K
| | - Cheng Chen
- Global Process
Chemistry, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065, United States
| | - Ed Cleator
- Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire,
EN11 9BU, U.K
| | - Mark McLaughlin
- Global Process
Chemistry, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065, United States
| | - Faye J. Sheen
- Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire,
EN11 9BU, U.K
| | - Gavin W. Stewart
- Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire,
EN11 9BU, U.K
| | - Yingju Xu
- Global Process
Chemistry, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065, United States
| | - Jingjun Yin.
- Global Process
Chemistry, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065, United States
| |
Collapse
|
9
|
Lominac WJ, D’Angelo ML, Smith MD, Ollison DA, Hanna JM. Construction of pyrazolo[3,4-b]pyridines and pyrazolo[4,3-c]pyridines by ring closure of 3-acylpyridine N-oxide tosylhydrazones. Tetrahedron Lett 2012; 53:906-909. [PMID: 22345825 PMCID: PMC3278155 DOI: 10.1016/j.tetlet.2011.12.055] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
3-Acylpyridine N-oxide tosylhydrazones give good overall yields of a mixture of pyrazolo[3,4-b]pyridines and pyrazolo[4,3-c]pyridines when treated with an electrophilic additive and an amine base. (Z)-Hydrazones cyclize readily, while (E)-hydrazones fail to react under the reported conditions. The reaction takes place at room temperature, and moderate regiocontrol over the cyclization can be achieved by varying the electrophile/solvent combination.
Collapse
Affiliation(s)
- William J. Lominac
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733 USA
| | - Megan L. D’Angelo
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733 USA
| | - Mark D. Smith
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208 USA
| | - Darius A. Ollison
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733 USA
| | - James M. Hanna
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733 USA
| |
Collapse
|
10
|
Bull JA, Mousseau JJ, Pelletier G, Charette AB. Synthesis of pyridine and dihydropyridine derivatives by regio- and stereoselective addition to N-activated pyridines. Chem Rev 2012; 112:2642-713. [PMID: 22352938 DOI: 10.1021/cr200251d] [Citation(s) in RCA: 676] [Impact Index Per Article: 56.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- James A Bull
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
| | | | | | | |
Collapse
|
11
|
Alam M, Goodyear A, Scott JP, Vickery TP. Development of a Safe and Practical N-Oxidation Procedure Using m-CPBA in Acetic Acid. Org Process Res Dev 2011. [DOI: 10.1021/op100280c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mahbub Alam
- Global Process Chemistry, Merck Sharp & Dohme Research Laboratories, Hertford Road, Hoddesdon EN11 9BU, Hertfordshire, U.K
| | - Adrian Goodyear
- Global Process Chemistry, Merck Sharp & Dohme Research Laboratories, Hertford Road, Hoddesdon EN11 9BU, Hertfordshire, U.K
| | - Jeremy P. Scott
- Global Process Chemistry, Merck Sharp & Dohme Research Laboratories, Hertford Road, Hoddesdon EN11 9BU, Hertfordshire, U.K
| | - Thomas P. Vickery
- Chemical and Engineering Research and Development, Merck Sharp & Dohme Corporation, Rahway, New Jersey 07065, United States
| |
Collapse
|
12
|
Viciu MS, Gupta L, Collum DB. Mechanism of lithium diisopropylamide-mediated substitution of 2,6-difluoropyridine. J Am Chem Soc 2010; 132:6361-5. [PMID: 20397635 PMCID: PMC2872121 DOI: 10.1021/ja910834b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Treatment of 2,6-difluoropyridine with lithium diisopropylamide in THF solution at -78 degrees C effects ortholithiation quantitatively. Warming the solution to 0 degrees C converts the aryllithium to 2-fluoro-6-(diisopropylamino)pyridine. Rate studies reveal evidence of a reversal of the ortholithiation and a subsequent 1,2-addition via two monomer-based pathways of stoichiometries [ArH*i-Pr(2)NLi(THF)](double dagger) and [ArH*i-Pr(2)NLi(THF)(3)](double dagger). Computational studies fill in the structural details and provide evidence of a direct substitution without the intermediacy of a Meisenheimer complex.
Collapse
Affiliation(s)
- Mihai S. Viciu
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Lekha Gupta
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - David B. Collum
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| |
Collapse
|