1
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Wang L, Zhang Y, Miao AQ, Zhang TS, Wang X, Hao WJ, Tu SJ, Jiang B. Nitrative bicyclization of 1,7-diynes for accessing skeletally diverse tricyclic pyrroles. Chem Commun (Camb) 2022; 58:4376-4379. [PMID: 35297437 DOI: 10.1039/d2cc00206j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel metal-free nitrative bicyclization of 1,7-diynes with tBuONO in the presence of H2O is reported, producing three types of skeletally diverse tricyclic pyrroles, namely pyrrolo[3,4-c]quinolines, chromeno[3,4-c]pyrroles and benzo[e]isoindoles, with moderate to good yields by simply tuning the linkers of the 1,7-diynes. This domino protocol demonstrates remarkable compatibility regarding 1,7-diynes with different linkers, such as nitrogen and oxygen atoms and a hydroxymethyl group, and tBuONO plays dual roles as a nitro precursor as well as a nitrogen atom source.
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Affiliation(s)
- Lu Wang
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
| | - Yin Zhang
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
| | - An-Qi Miao
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
| | - Tian-Shu Zhang
- School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, P. R. China.
| | - Xiang Wang
- School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huaian 223300, People's Republic of China
| | - Wen-Juan Hao
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
| | - Shu-Jiang Tu
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
| | - Bo Jiang
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
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2
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Khomenko DM, Doroshchuk RO, Ohorodnik YM, Ivanova HV, Zakharchenko BV, Raspertova IV, Vaschenko OV, Dobrydnev AV, Grygorenko OO, Lampeka RD. Expanding the chemical space of 3(5)-functionalized 1,2,4-triazoles. Chem Heterocycl Compd (N Y) 2022; 58:116-128. [PMID: 35340781 PMCID: PMC8940976 DOI: 10.1007/s10593-022-03064-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 01/30/2022] [Indexed: 01/30/2023]
Abstract
An efficient approach to the gram-scale synthesis of 3(5)-substituted, 1,3- and 1,5-disubstituted 1,2,4-triazole-derived building blocks is described. The key synthetic precursors - 1,2,4-triazole-3(5)-carboxylates (20 examples, 35-89% yield) were prepared from readily available acyl hydrazides and ethyl 2-ethoxy-2-iminoacetate hydrochloride. Further transformations were performed following the convergent synthetic strategy and allowed the preparation of 1,3- and 1,5-disubstituted 1,2,4-triazole-derived esters (16 examples, 25-75% yield), 3(5)-substituted, 1,3- and 1,5-disubstituted carboxylate salts (18 examples, 78-93% yield), amides (5 examples, 82-93% yield), nitriles (5 examples, 30-85% yield), hydrazides (6 examples, 84-89% yield), and hydroxamic acids (3 examples, 73-78% yield). Considering wide applications of the 1,2,4-triazole motif in medicinal chemistry, these compounds are valuable building blocks for lead-oriented synthesis; they have also great potential for coordination chemistry. Supplementary Information The online version contains supplementary material available at 10.1007/s10593-022-03064-z.
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Affiliation(s)
- Dmytro M. Khomenko
- Enamine Ltd., 78 Chervonotkatska St., Kyiv, 02094 Ukraine
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska St., Kyiv, 01601 Ukraine
| | - Roman O. Doroshchuk
- Enamine Ltd., 78 Chervonotkatska St., Kyiv, 02094 Ukraine
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska St., Kyiv, 01601 Ukraine
| | - Yulia M. Ohorodnik
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska St., Kyiv, 01601 Ukraine
| | - Hanna V. Ivanova
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska St., Kyiv, 01601 Ukraine
| | - Borys V. Zakharchenko
- Enamine Ltd., 78 Chervonotkatska St., Kyiv, 02094 Ukraine
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska St., Kyiv, 01601 Ukraine
| | - Ilona V. Raspertova
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska St., Kyiv, 01601 Ukraine
| | | | - Alexey V. Dobrydnev
- Enamine Ltd., 78 Chervonotkatska St., Kyiv, 02094 Ukraine
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska St., Kyiv, 01601 Ukraine
| | - Oleksandr O. Grygorenko
- Enamine Ltd., 78 Chervonotkatska St., Kyiv, 02094 Ukraine
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska St., Kyiv, 01601 Ukraine
| | - Rostyslav D. Lampeka
- Taras Shevchenko National University of Kyiv, 60 Volodymyrska St., Kyiv, 01601 Ukraine
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3
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Zhu JN, Wang WK, Zhu Y, Hu YQ, Zhao SY. Cascade Functionalization of C(sp3)–Br/C(sp2)–H Bonds: Access to Fused Benzo[e]isoindole-1,3,5-trione via Visible-Light-Induced Reductive Radical Relay Strategy. Org Lett 2019; 21:6270-6274. [DOI: 10.1021/acs.orglett.9b02153] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jia-Nan Zhu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People’s Republic of China
| | - Wen-Kang Wang
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People’s Republic of China
| | - Yuan Zhu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People’s Republic of China
| | - Yin-Qiu Hu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People’s Republic of China
| | - Sheng-Yin Zhao
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People’s Republic of China
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4
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Chang L, Thorimbert S, Dechoux L. The bio-based methyl coumalate involved Morita–Baylis–Hillman reaction. Org Biomol Chem 2019; 17:2784-2791. [DOI: 10.1039/c9ob00328b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient and sustainable method to prepare pharmaceutically important pyrone derivatives under very mild conditions, from bio-based methyl coumalate, is reported.
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Affiliation(s)
- Liang Chang
- Sorbonne Université
- CNRS
- Institut Parisien de Chimie Moléculaire
- IPCM
- F-75005 Paris
| | - Serge Thorimbert
- Sorbonne Université
- CNRS
- Institut Parisien de Chimie Moléculaire
- IPCM
- F-75005 Paris
| | - Luc Dechoux
- Sorbonne Université
- CNRS
- Institut Parisien de Chimie Moléculaire
- IPCM
- F-75005 Paris
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5
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Xing S, Gu N, Wang X, Liu J, Xing C, Wang K, Zhu B. Substitution-Controlled Selective Formation of Hexahydrobenz[ e]isoindoles and 3-Benzazepines via In(OTf) 3-Catalyzed Tandem Annulations. Org Lett 2018; 20:5680-5683. [PMID: 30188133 DOI: 10.1021/acs.orglett.8b02406] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A dramatic N-substituent controlled tandem annulation of 2-(2-(2-bromoethyl)phenyl)-1-sulfonylaziridines with 1,3-dicarbonyl compounds has been developed. When the N-substituent was a 4-methylbenzenesulfonyl group (Ts), sequential ring opening of aziridines, nucleophilic substitution, and lactamization took place to provide a series of hexahydrobenz[ e]isoindole compounds in good yields with good diastereoselectivities. By contrast, 3-benzazepine compounds were afforded in good yields via ring opening of aziridines and nucleophilic substitution when the N-substituent was the 4-nitrobenzenesulfonyl group (Ns).
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Affiliation(s)
- Siyang Xing
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry , Tianjin Normal University , Tianjin 300387 , People's Republic of China
| | - Nan Gu
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry , Tianjin Normal University , Tianjin 300387 , People's Republic of China
| | - Xin Wang
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry , Tianjin Normal University , Tianjin 300387 , People's Republic of China
| | - Jingyi Liu
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry , Tianjin Normal University , Tianjin 300387 , People's Republic of China
| | - Chunyan Xing
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry , Tianjin Normal University , Tianjin 300387 , People's Republic of China
| | - Kui Wang
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry , Tianjin Normal University , Tianjin 300387 , People's Republic of China
| | - Bolin Zhu
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry , Tianjin Normal University , Tianjin 300387 , People's Republic of China
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6
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Xu W, Huang J, Jiang R, Yuan M. Crystal structures, absolute configurations and molecular docking studies of naftopidil enantiomers as α1D-adrenoceptor antagonists. Acta Pharm Sin B 2017; 7:496-501. [PMID: 28752036 PMCID: PMC5518653 DOI: 10.1016/j.apsb.2017.04.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 02/28/2017] [Accepted: 03/16/2017] [Indexed: 12/02/2022] Open
Abstract
Chiral drug naftopidil (NAF), a specific α1D-adrenoceptor (AR) antagonist for the treatment of benign prostatic hyperplasia, was used in racemic form for several decades. Our recent work declared that NAF enantiomers showed the same antagonistic effects on the α1D-AR, but the binding mechanism of these two stereochemical NAF isomers to the α1D receptor remained unclear. Herein, we reported the crystallographic structures of optically pure NAF stereoisomers for the first time and unambiguously determined their absolute configurations. The crystal data of R and S enantiomers matched satisfactorily the pharmacophore model for α1D-selective antagonists. Based on the constructed α1D homology model, molecular docking studies shed light on the molecular mechanism of NAF enantiomers binding to α1D-AR. The results indicated that NAF enantiomers exhibited the very similar binding poses and occupied the same binding pocket.
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7
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Gill RK, Singh H, Raj T, Sharma A, Singh G, Bariwal J. 4-Substituted thieno[2,3-d
]pyrimidines as potent antibacterial agents: Rational design, microwave-assisted synthesis, biological evaluation and molecular docking studies. Chem Biol Drug Des 2017; 90:1115-1121. [DOI: 10.1111/cbdd.13028] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 04/27/2017] [Accepted: 05/01/2017] [Indexed: 01/24/2023]
Affiliation(s)
- Rupinder K. Gill
- Department of Pharmaceutical Chemistry; ISF College of Pharmacy; Moga Punjab India
- I. K. Gujral Punjab Technical University; Kapurthala, Jalandhar Punjab India
| | - Harpreet Singh
- Department of Chemistry; Guru Nanak Dev University; Amritsar India
| | - Tilak Raj
- Toxicology Division; Forensic Science Laboratory, Phase-IV; Mohali Punjab India
| | - Anuradha Sharma
- University Institute of Pharmaceutical Sciences; Panjab University; Chandigarh India
| | - Gagandeep Singh
- Bioorganic and Photochemistry Laboratory; Department of Pharmaceutical Sciences; Guru Nanak Dev University; Amritsar Punjab India
| | - Jitender Bariwal
- Department of Pharmaceutical Chemistry; ISF College of Pharmacy; Moga Punjab India
- Shiva Institute of B. Pharmacy; Chandpur, Bilaspur Himachal Pradesh India
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8
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Yoshida T, Mori K. Hf(OTf)4-Catalyzed highly diastereoselective synthesis of 1,3-disubstituted tetralin derivatives via benzylic C(sp3)–H bond functionalization. Chem Commun (Camb) 2017; 53:4319-4322. [DOI: 10.1039/c7cc01717k] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly diastereoselective synthesis of 1,3-disubstituted tetralin derivatives was achieved via Hf(OTf)4-catalyzed benzylic C(sp3)–H bond functionalization.
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Affiliation(s)
- Taira Yoshida
- Department of Applied Chemistry
- Graduate School of Engineering
- Tokyo University of Agriculture and Technology
- Tokyo 184-8588
- Japan
| | - Keiji Mori
- Department of Applied Chemistry
- Graduate School of Engineering
- Tokyo University of Agriculture and Technology
- Tokyo 184-8588
- Japan
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9
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Xu W, Shao B, Xu X, Jiang R, Yuan M. Structural analysis of (S)-1-((1H-benzo[d][1,2,3]triazol-1-yl)oxy)-3-(4-(2-methoxyphenyl)piperazin-1-yl)propan-2-ol and binding mechanism with α1A-adrenoceptor: TDDFT calculations, X-ray crystallography and molecular docking. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.10.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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10
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Xu W, Huang JJ, Shao BH, Xu XJ, Jiang RW, Yuan M. X-ray Crystallography, DFT Calculations and Molecular Docking of Indole-Arylpiperazine Derivatives as α1A-Adrenoceptor Antagonists. Molecules 2015; 20:19674-89. [PMID: 26528963 PMCID: PMC6332402 DOI: 10.3390/molecules201119651] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 10/16/2015] [Indexed: 01/22/2023] Open
Abstract
Indole-arylpiperazine derivatives have exhibited good selectivity for the α1A-adrenoceptor, but the structure-activity-binding mechanism relationship remains unclear. In the current study, three compounds (1, 2 and 3) were investigated through single-crystal X-ray diffraction analysis, density functional theory (DFT) calculations and molecular docking using a homology model of the α1A receptor. Compounds 1 and 3 form H-bonds networks to stabilize their three-dimensional structures, while C–H···π interactions play a significant role in the packing of 2. Based on DFT-optimized conformations, the HOMO-LUMO energy gaps and molecular electrostatic potential (MEP) were theoretically calculated at the B3LYP/6-311G (d, p) level of theory. Chemical reactivity increases in the order of 3 < 2 < 1, and the maximum positive region of the MEP maps is mainly localized over the NH group. The binding mechanisms of ligand-α1A-adrenoceptor complexes were illustrated by molecular docking. Binding to Gln177 of the second extracellular loop region via hydrogen bonds is likely to be essential for α1A-selective antagonists. The present work sheds light on the studies of structure-activity-binding mechanism and aids in the design of α1A antagonists with high selectivity.
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Affiliation(s)
- Wei Xu
- Pharmaceutical Research Center, Guangzhou Medical University, 195# Dongfengxi Road, Guangzhou 510182, China.
| | - Jun-Jun Huang
- Pharmaceutical Research Center, Guangzhou Medical University, 195# Dongfengxi Road, Guangzhou 510182, China.
| | - Bin-Hao Shao
- Pharmaceutical Research Center, Guangzhou Medical University, 195# Dongfengxi Road, Guangzhou 510182, China.
| | - Xing-Jie Xu
- Pharmaceutical Research Center, Guangzhou Medical University, 195# Dongfengxi Road, Guangzhou 510182, China.
| | - Ren-Wang Jiang
- School of Pharmaceutical Sciences, Jinan University, Guangzhou 510632, China.
| | - Mu Yuan
- Pharmaceutical Research Center, Guangzhou Medical University, 195# Dongfengxi Road, Guangzhou 510182, China.
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11
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Elkanzi NAA, Morsy NM, Aly AA, Brown AB, Ramadan M. New Pyrimidine-2-thiones from Reactions of Amidrazonethiols with 2-Amino-1,1,2-ethenetricarbonitrile and Investigation of Their Antitumor Activity. J Heterocycl Chem 2015. [DOI: 10.1002/jhet.2495] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- N. A. A. Elkanzi
- Chemistry Department, College of Science; Al Jouf University; Sakaka Al Jouf Kingdom of Saudi Arabia
| | - Nesrin M. Morsy
- Chemistry Department, College of Science; Al Jouf University; Sakaka Al Jouf Kingdom of Saudi Arabia
| | - Ashraf A. Aly
- Chemistry Department, Faculty of Science; Minia University; 61519 Minya Egypt
| | - Alan B. Brown
- Chemistry Department; Florida Institute of Technology; Melbourne Florida 32901 USA
| | - Mohamed Ramadan
- Organic Chemistry Department, Faculty of Pharmacy; Al-Azhar University; Asyut Egypt
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12
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Mahmoud MR, El-Azm FSMA, Ali AT, Ali YM. Design, Synthesis, and Antimicrobial Evaluation of Novel Thienopyrimidines and Triazolothienopyrimidines. SYNTHETIC COMMUN 2015. [DOI: 10.1080/00397911.2014.999340] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Mahmoud R. Mahmoud
- Synthetic Laboratory, Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt
| | - Fatma S. M. Abu El-Azm
- Synthetic Laboratory, Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt
| | - Amira T. Ali
- Synthetic Laboratory, Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt
| | - Yasmeen M. Ali
- Synthetic Laboratory, Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt
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13
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Bagley MC, Dwyer JE, Molina MDB, Rand AW, Rand HL, Tomkinson NCO. Microwave-assisted synthesis of 3-aminobenzo[b]thiophene scaffolds for the preparation of kinase inhibitors. Org Biomol Chem 2015; 13:6814-24. [DOI: 10.1039/c5ob00819k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Microwave-assisted synthesis of 3-aminobenzo[b]thiophenes has been applied to 3 kinase inhibitor scaffolds.
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Affiliation(s)
- Mark C. Bagley
- Department of Chemistry
- School of Life Sciences
- University of Sussex
- Brighton, East Sussex
- UK
| | - Jessica E. Dwyer
- Department of Chemistry
- School of Life Sciences
- University of Sussex
- Brighton, East Sussex
- UK
| | | | - Alexander W. Rand
- Department of Chemistry
- School of Life Sciences
- University of Sussex
- Brighton, East Sussex
- UK
| | - Hayley L. Rand
- Department of Chemistry
- School of Life Sciences
- University of Sussex
- Brighton, East Sussex
- UK
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14
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Romeo G, Salerno L, Pittalà V, Modica MN, Siracusa MA, Materia L, Buccioni M, Marucci G, Minneman KP. High affinity ligands and potent antagonists for the α1D-adrenergic receptor. Novel 3,8-disubstituted [1]benzothieno[3,2-d]pyrimidine derivatives. Eur J Med Chem 2014; 83:419-32. [DOI: 10.1016/j.ejmech.2014.06.057] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 06/13/2014] [Accepted: 06/25/2014] [Indexed: 10/25/2022]
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15
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Synthesis and biological activities of novel anthranilic diamides analogues containing benzo[b]thiophene. Chem Res Chin Univ 2013. [DOI: 10.1007/s40242-013-2319-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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16
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POM analyses for antimicrobial evaluation of thienopyrimidinones derivatives: a rapid method for drug design. Med Chem Res 2013. [DOI: 10.1007/s00044-013-0614-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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17
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Synthesis and antimicrobial activity of some new thieno[2,3-b]thiophene derivatives. Molecules 2013; 18:4669-78. [PMID: 23603949 PMCID: PMC6270460 DOI: 10.3390/molecules18044669] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 04/10/2013] [Accepted: 04/16/2013] [Indexed: 11/26/2022] Open
Abstract
A series of thieno[2,3-b]thiophene moiety-containing bis-cyanopyrazoles 5a–c, bis-aminopyrazole 9 and bis-pyridazine derivatives 11 were synthesized and evaluated in vitro for their antimicrobial potential. The antimicrobial activity of some selected products was evaluated and showed good results. 5,5'-(3,4-Dimethylthieno[2,3-b]thiophene-2,5-diyl)bis(3-acetyl-1-(4-chlorophenyl)-1H-pyrazole-4-carbonitrile) (5d) was found to be more potent than the standard drug amphotericin B against Geotricum candidum and equipotent to amphotericin Bagainst Syncephalastrum racemosum. In addition, it was found to be equipotent to the standard drug Penicillin G against Staphylococcus aureus. Moreover, it was more potent than the standard drug streptomycin against Pseudomonas aeruginosa and Escherichia coli.
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18
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Aratani T, Tahara K, Takeuchi S, Kitamura S, Murai M, Fujinami S, Inomata K, Ukaji Y. Asymmetric Bis(alkoxycarbonylation) Reaction of Cyclic Olefins Catalyzed by Palladium in the Presence of Copper(I) Triflate. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2012. [DOI: 10.1246/bcsj.20120125] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takahiro Aratani
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University
| | - Kenji Tahara
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University
| | - Susumu Takeuchi
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University
| | - Satoko Kitamura
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University
| | - Moemi Murai
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University
| | - Shuhei Fujinami
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University
| | - Katsuhiko Inomata
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University
| | - Yutaka Ukaji
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University
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19
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Reshak AH, Kityk IV, Khenata R, Al-Douri Y, Auluck S. An ab initio density functional study of the optical functions of 9-Methyl-3-Thiophen-2-YI-Thieno [3,2e] [1,2,4] Thriazolo [4,3c] Pyrimidine-8-Carboxylic Acid Ethyl Ester crystals. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 95:582-588. [PMID: 22580145 DOI: 10.1016/j.saa.2012.04.055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2012] [Accepted: 04/10/2012] [Indexed: 05/31/2023]
Abstract
An ab initio investigation of the optical constants of 9-Methyl-3-Thiophen-2-YI-Thieno [3,2e] [1,2,4] Thriazolo [4,3c] Pyrimidine-8-Carboxylic Acid Ethyl Ester crystal is performed within a framework of local density approximation (LDA), and the Engel-Vosko generalized gradient approximation (EV-GGA) exchange correlation potentials. It is established that there are two independent molecules (A and B) exhibiting different intra-molecular interactions: C-H⋯O (A) and C-H⋯N (B). These intra-molecular interactions favor stabilization of the crystal structure for molecules A and B. It should be emphasized that there exist remarkable π-π interactions between the pyrimidine rings of the two neighbors B molecules giving extra strengths and stabilizations to the superamolecular structure. These different intra-molecular interactions C-H⋯O (A) and C-H⋯N (B) and the π-π interaction between the pyrimidine rings of the two neighbors B molecules give principal contribution to dispersion of optical properties. With a view to seek deeper insight into the electronic structure, the optical properties were investigated. Our calculations show that the optical constants are very anisotropic. The EVGGA calculation shows a blue spectral shift of around 0.024 eV with significant changes in the spectra compared to the LDA calculation. The observed spectral shifts are in agreement with the calculated band structure and corresponding electron density of states.
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Affiliation(s)
- Ali H Reshak
- School of Complex Systems, FFWP - South Bohemia University, Nove Hrady 37333, Czech Republic.
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20
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Synthesis and α1-adrenoceptor antagonist activity of tamsulosin analogues. Eur J Med Chem 2010; 45:5800-7. [DOI: 10.1016/j.ejmech.2010.09.042] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Revised: 09/16/2010] [Accepted: 09/17/2010] [Indexed: 11/21/2022]
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21
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Cantrell MA, Bream-Rouwenhorst HR, Hemerson P, Magera JS. Silodosin for benign prostatic hyperplasia. Ann Pharmacother 2010; 44:302-10. [PMID: 20071497 DOI: 10.1345/aph.1m320] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
OBJECTIVE To review the pharmacology, pharmacokinetics, clinical trials, and safety of silodosin, a recently approved alpha(1A)-adrenergic receptor (AR) antagonist for benign prostatic hyperplasia (BPH). DATA SOURCES English-only articles obtained from MEDLINE (1966-October 2009) using the search terms silodosin and KMD-3213 were reviewed. In addition, a search of International Pharmaceutical Abstracts (1970-October 2009) was conducted. STUDY SELECTION AND DATA EXTRACTION Available English-language articles were reviewed, as well as abstracts from available non-English articles. DATA SYNTHESIS Silodosin reduces urinary symptoms associated with BPH in as little as 1 day after initiation. The largest clinical trial conducted to date demonstrated a decrease in International Prostate Symptom Score of -6.4 +/- 6.63 points compared to -3.5 +/- 5.84 in patients receiving placebo (p < 0.0001). Silodosin also improved urinary flow rates by approximately 2.8 +/- 3.44 mL/sec, which is comparable to other alpha(1)-AR antagonists. The usual dose of silodosin is 8 mg once daily and should be reduced to 4 mg for patients with moderate renal dysfunction. Use is contraindicated in patients with severe renal and hepatic impairment or taking strong CYP3A4 inhibitors. In clinical trials, the most prevalent adverse effects were ejaculatory disturbances, occurring in approximately 28% of patients, although only 2.8% of patients discontinued treatment due to this adverse effect. Preliminary data suggest that, similar to other third-generation alpha(1A)-AR antagonists, silodosin has little potential to cause significant cardiovascular adverse effects such as orthostatic hypotension or syncope. To confirm these findings, long-term studies are still needed, especially in patients taking antihypertensive agents and in those with a history of intolerance to other alpha(1)-AR antagonists. CONCLUSIONS Silodosin was approved by the Food and Drug Administration in 2008. Long-term studies demonstrating improvement in clinically important outcomes of BPH have yet to be published. In addition, pharmacoeconomic analyses would assist in defining its current place in therapy. Until this information is available, silodosin may be best reserved as an alternative to other second- and third-generation alpha(1)-AR antagonists.
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Affiliation(s)
- Matthew A Cantrell
- College of Pharmacy, University of Iowa; Clinical Pharmacy Specialist, Veterans Affairs Medical Center, Iowa City, IA, USA.
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22
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Synthesis and antimicrobial activity of some novel thienopyrimidines and triazolothienopyrimidines. J CHEM SCI 2009. [DOI: 10.1007/s12039-009-0034-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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23
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Jain KS, Bariwal JB, Kathiravan MK, Phoujdar MS, Sahne RS, Chauhan BS, Shah AK, Yadav MR. Recent advances in selective α1-adrenoreceptor antagonists as antihypertensive agents. Bioorg Med Chem 2008; 16:4759-800. [DOI: 10.1016/j.bmc.2008.02.091] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2008] [Revised: 02/27/2008] [Accepted: 02/27/2008] [Indexed: 11/29/2022]
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24
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Aratani T, Tahara K, Takeuchi S, Ukaji Y, Inomata K. Asymmetric Bis(alkoxycarbonylation) Reaction of Cyclic Olefins Catalyzed by Palladium in the Presence of Copper(I) Triflate. CHEM LETT 2007. [DOI: 10.1246/cl.2007.1328] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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25
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Perez DM. Structure-function of alpha1-adrenergic receptors. Biochem Pharmacol 2006; 73:1051-62. [PMID: 17052695 PMCID: PMC2034198 DOI: 10.1016/j.bcp.2006.09.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2006] [Revised: 09/07/2006] [Accepted: 09/11/2006] [Indexed: 11/17/2022]
Abstract
The Easson-Stedman hypothesis provided the rationale for the first studies of drug design for the alpha(1)-adrenergic receptor. Through chemical modifications of the catecholamine core structure, the need was established for a protonated amine, a beta-hydroxyl on a chiral center, and an aromatic ring with substitutions capable of hydrogen bonding. After the receptors were cloned and three alpha(1)-adrenergic receptor subtypes were discovered, drug design became focused on the analysis of receptor structure and new interactions were uncovered. It became clear that alpha(1)- and beta-adrenergic receptors did not share stringent homology in the ligand-binding pocket but this difference has allowed for more selective drug design. Novel discoveries on allosterism and agonist trafficking may be used in the future design of therapeutics with fewer side effects. This review will explore past and current knowledge of the structure-function of the alpha(1)-adrenergic receptor subtypes.
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Affiliation(s)
- Dianne M Perez
- Department of Molecular Cardiology, NB5, The Cleveland Clinic Foundation, Lerner Research Institute, 9500 Euclid Avenue, Cleveland, OH 44195, USA.
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26
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El-Baih FEM, Al-Blowy HAS, Al-Hazimi HM. Synthesis of some thienopyrimidine derivatives. Molecules 2006; 11:498-513. [PMID: 17971721 DOI: 10.3390/11070498] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2006] [Revised: 06/28/2006] [Accepted: 07/02/2006] [Indexed: 11/16/2022] Open
Abstract
Thioxothienopyrimidinones, alkylthio- and arylalkylthiothienopyrimidinones, thienopyrimidinones, thienopyrimidines a thienopyrimidinedione and a thienotriazolo-pyrimidinone were prepared from 2-amino-3-carboethoxy-4,5-disubstituted thiophenes and 2-amino-3-cyano-4,5-disubstituted thiophenes via reactions with different reagents.
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Affiliation(s)
- Fatma E M El-Baih
- Chemistry Department, College of Science, King Saud University, P.O. Box 22452, Riyadh 11495, Saudi Arabia.
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27
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28
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Kranjc K, Polanc S, Kocevar M. Diels-Alder reactions of fused pyran-2-ones with maleimides: efficient syntheses of benz[e]isoindoles and related systems. Org Lett 2003; 5:2833-6. [PMID: 12889886 DOI: 10.1021/ol034852q] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] The Diels-Alder reaction of some substituted 5,6,7,8-tetrahydro-2H-1-benzopyran-2-ones (1a-f) with N-substituted maleimides (2a-c) leading to fused isoindole derivatives (5a-n, 7) or, in a few cases, to bridged double cycloadducts (fused bicyclo[2.2.2]octene derivatives) (6a-f) is presented. When X = CO, the first efficient, substituent-driven aromatization of an intermediary-formed cycloadduct was observed, resulting in substituted benz[e]isoindoles (5a-k). The same type of aromatization can also be achieved in an unprecedented catalysis with Rh/C.
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Affiliation(s)
- Kristof Kranjc
- University of Ljubljana, Faculty of Chemistry and Chemical Technology, Askerceva 5, SI-1000 Ljubljana, Slovenia
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29
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Thiyagarajan M. alpha-Adrenoceptor antagonists in the treatment of benign prostate hyperplasia. Pharmacology 2002; 65:119-28. [PMID: 12037374 DOI: 10.1159/000058037] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Benign prostate hyperplasia (BPH) is a common malady affecting elderly men throughout the world, and it is the most common cause of voiding dysfunctions in man. The disease becomes prevalent, as the mean age of the population increases. In BPH the glandular cells and myofibroblasts of periurethral and transition zones proliferate excessively. This excessive growth of tissue mass physically compresses the urethra, leading to urinary obstruction and lower urinary tract symptoms (LUTS). Another major factor that contributes to LUTS in BPH is the increase in smooth muscle tone, a dynamic component. Contraction of the prostate gland is mainly under the control of the autonomic system and is mediated through alpha-adrenoceptors. In addition to alpha1-adrenoceptors, there are many other components that influence growth and contraction of the prostate gland, resulting in the development of BPH and LUTS. The prostate gland is contracted on stimulating 5-HT, endothelin, tachykinin, and muscarinic cholinergic receptors. Growth of the prostate gland is under the control of androgens, endothelin growth factor, vasoactive intestinal peptide, nerve growth factor, and growth hormone. The combination of excessive growth and the tone produced by different components results in LUTS and BPH. alpha1-Adrenoceptor antagonists were successfully used in the treatment of BPH to relieve the LUTS. The high selectivity of alpha1A-adrenoceptor antagonists reflects the uroselectivity. The uroselective compounds like terazosin, doxazosin, tamsulosin, and alfuzosin are in clinical use. Other new potent uroselective compounds, which are analogs of nigulidipine, 5-methyl-urapidil, or naftopidil, are in clinical trials. In addition to alpha-antagonists, antiandrogens (5alpha-reductase inhibitors) and polyherbal formulations are used to treat BPH. The success of BPH treatment lies in the development of new chemical entities which are efficacious as well as more uroselective and hence have least side effects.
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Affiliation(s)
- M Thiyagarajan
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research, SAS Nagar (Mohali), India.
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30
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Quaglia W, Pigini M, Piergentili A, Giannella M, Gentili F, Marucci G, Carrieri A, Carotti A, Poggesi E, Leonardi A, Melchiorre C. Structure-activity relationships in 1,4-benzodioxan-related compounds. 7. Selectivity of 4-phenylchroman analogues for alpha(1)-adrenoreceptor subtypes. J Med Chem 2002; 45:1633-43. [PMID: 11931617 DOI: 10.1021/jm011066n] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
WB4101 (1)-related compounds 5-10 were synthesized, and their biological profile at alpha(1)-adrenoreceptor (AR) subtypes and 5-HT(1A) serotoninergic receptors was assessed by binding assays in Chinese hamster ovary and HeLa cell membranes expressing the human cloned receptors. Moreover, their receptor selectivity was further determined in functional experiments in isolated rat prostate (alpha(1A)), vas deferens (alpha(1A)), aorta (alpha(1D)), and spleen (alpha(1B)). In functional assays, compound 5 was the most potent at alpha(1D)-ARs with a reversed selectivity profile (alpha(1D) > alpha(1A) > alpha(1B)) relative to both prototype 1 and phendioxan (2) (alpha(1A) > alpha(1D) > alpha(1B)), whereas compound 8, bearing a carbonyl moiety at position 1, was the most potent at alpha(1A)-ARs with a selectivity profile similar to that of prototypes. The least potent of the series was the trans isomer 6, suggesting that optimum alpha(1)-AR blocking activity in this series is associated with a cis relationship between the 2-side chain and the 4-phenyl ring rather than a trans relationship as previously observed for the 2-side chain and the 3-phenyl ring in 2 and related compounds. Binding affinity results were not in complete agreement with the selectivity profiles deriving from functional experiments. Although a firm explanation was not available, neutral and negative antagonism and receptor dimerization were considered as two possibilities to account for the difference between binding and functional affinities. Finally, compound 5 was selected for a modeling study in comparison with 1, mephendioxan (3), and open phendioxan (4) to achieve information on the physicochemical interactions that account for its high affinity toward alpha(1d/D)-ARs.
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MESH Headings
- Adrenergic alpha-Antagonists/chemical synthesis
- Adrenergic alpha-Antagonists/chemistry
- Adrenergic alpha-Antagonists/pharmacology
- Animals
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/physiology
- CHO Cells
- Chromans/chemical synthesis
- Chromans/chemistry
- Chromans/pharmacology
- Cricetinae
- Dioxanes/chemical synthesis
- Dioxanes/chemistry
- Dioxanes/pharmacology
- HeLa Cells
- Humans
- In Vitro Techniques
- Male
- Models, Molecular
- Muscle Contraction/drug effects
- Muscle, Smooth/drug effects
- Muscle, Smooth/physiology
- Prostate/drug effects
- Prostate/physiology
- Radioligand Assay
- Rats
- Rats, Wistar
- Receptors, Adrenergic, alpha-1/drug effects
- Receptors, Adrenergic, alpha-1/metabolism
- Receptors, Serotonin/metabolism
- Receptors, Serotonin, 5-HT1
- Spleen/drug effects
- Spleen/physiology
- Structure-Activity Relationship
- Vas Deferens/drug effects
- Vas Deferens/physiology
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Affiliation(s)
- Wilma Quaglia
- Department of Chemical Sciences, University of Camerino, Via S. Agostino 1, 62032 Camerino (MC), Italy
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31
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Meyer MD, Altenbach RJ, Bai H, Basha FZ, Carroll WA, Kerwin JF, Lebold SA, Lee E, Pratt JK, Sippy KB, Tietje K, Wendt MD, Brune ME, Buckner SA, Hancock AA, Drizin I. Structure-activity studies for a novel series of bicyclic substituted hexahydrobenz[e]isoindole alpha1A adrenoceptor antagonists as potential agents for the symptomatic treatment of benign prostatic hyperplasia. J Med Chem 2001; 44:1971-85. [PMID: 11384242 DOI: 10.1021/jm000541z] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In search of a uroselective alpha1A subtype selective antagonist, a novel series of 6-OMe hexahydrobenz[e]isoindoles attached to a bicyclic heterocyclic moiety via a two-carbon linker was synthesized. It was found that in contrast to the previously described series of tricyclic heterocycles,(1) this bicyclic series has very specific requirements for the heterocyclic attachments. The most important structural features contributing to the alpha1A/alpha1B selectivity of these compounds were identified. In vitro functional assays for the alpha1 adrenoceptor subtypes were used to further characterize the most selective compounds, and in vivo models of vascular vs prostatic tone were used to assess uroselectivity. Compound 48 showed the highest degree of selectivity in the radioligand binding assays (56-fold), in the in vitro functional tests (80-fold), and for in vivo prostate selectivity (960-fold).
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Affiliation(s)
- M D Meyer
- Neurological and Urological Diseases Research, Pharmaceutical Products Division, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, Illinois 60064, USA
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32
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Bolognesi ML, Marucci G, Angeli P, Buccioni M, Minarini A, Rosini M, Tumiatti V, Melchiorre C. Analogues of prazosin that bear a benextramine-related polyamine backbone exhibit different antagonism toward alpha1-adrenoreceptor subtypes. J Med Chem 2001; 44:362-71. [PMID: 11462977 DOI: 10.1021/jm000995w] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hybrid tetraaamine disulfides 4-9 were synthesized by combining the structural features of prazosin (1), a competitive alpha1-adrenoreceptor antagonist, and benextramine (2), an irreversible alpha1/alpha2-adrenoreceptor antagonist, and their biological profiles at alpha1-adrenoreceptor subtypes were assessed by functional experiments in isolated rat vas deferens (alpha1A), spleen (alpha1B), and aorta (alpha1D). To verify the role of the disulfide moiety on the interaction with alpha1-adrenoreceptor subtypes, carbon analogues 10-15 were included in this study. All quinazolines lacking the disulfide bridge behaved, like 1, as competitive antagonists, whereas all polyamine disulfides displayed a nonhomogeneous mechanism of inhibition at the three subtypes since they were, like 2, noncompetitive antagonists at the alpha1A and alpha1B subtypes while being, unlike 2, competitive antagonists at the alpha1D. In particular, the blocking effects were characterized by a decrease of the maximal response to noradrenaline that was affected only slightly by washings. Probably the alpha1A and alpha1B subtypes bear in the binding pocket a suitable thiol function that would suffer an interchange reaction with the disulfide moiety of the antagonist and which is missing, or not accessible, in the alpha1D subtype. Polyamines 8, 9, and 14, among others, emerged as promising tools for the characterization of alpha1-adrenoreceptors, owing to their receptor subtype selectivity. Finally, the effect of nonbasic substituents on the phenyl ring of prazosin analogues 16-28 on potency and selectivity for the different subtypes can hardly be rationalized.
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Affiliation(s)
- M L Bolognesi
- Department of Pharmaceutical Sciences, University of Bologna, Italy
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33
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Andalò C, Bocchini P, Pozzi R, Galletti GC. Accurate mass measurement of synthetic analogues of prazosine by matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2001; 15:665-669. [PMID: 11319786 DOI: 10.1002/rcm.272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOFMS) has been investigated as a tool for accurate determination of the molecular mass of synthetic analogues of prazosine, a molecule used for the treatment of hypertension. Samples were dissolved in methanol, mixed with mass calibration standards, and crystallised on the target with alpha-cyano-4-hydroxycinnamic acid as matrix. Acquisition of spectra was rapidly completed in reflectron mode, allowing high resolution (6000-10000) and sensitive (about 1-10 pmol of sample on target) determination of the synthetic products. The results show the effectiveness of MALDI-TOFMS for accurate mass determination of these fairly large molecules, which are otherwise difficult to analyse by other high-resolution mass spectrometric techniques.
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Affiliation(s)
- C Andalò
- Department of Chemistry 'G. Ciamician', University of Bologna, Italy.
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