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Michalik D, Jiao H, Langer P. NMR spectroscopic and theoretical study on the isomerism of dimethyl benzodiazepine(diylidene)diacetates. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2022; 60:845-856. [PMID: 35373394 DOI: 10.1002/mrc.5272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/15/2022] [Accepted: 03/29/2022] [Indexed: 06/14/2023]
Abstract
The isomerism of dimethyl 2,2'-(7,8-dichloro-1H-benzo[b][1,4]diazepine-2,4-(3H,5H)diylidene)diacetate (1a) and dimethyl 2,2'-(7,8-dichloro-3-methyl-1H-benzo[b][1,4]diazepine-2,4-(3H,5H)diylidene)diacetate (1b) was investigated by 1 H, 13 C and 15 N nuclear magnetic resonance (NMR) spectroscopy. In CDCl3 solution, inversion of the diazepine ring was observed, whereas in (D6 )DMSO and (D7 )DMF solution, besides the ring inversion, a partial cleavage of one chelate ring appeared connected with (E/Z) isomerization about one of the exocyclic C=C bonds. Gibbs free energies (ΔG) and free activation energies (ΔG≠ ) were calculated based on B3PW91-SCRF/ZVP DFT computations. Agreement between NMR data and density functional theory (DFT) computations was found.
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Affiliation(s)
- Dirk Michalik
- Leibniz-Institut für Katalyse (LIKAT), Rostock, Germany
- Institut für Chemie, Universität Rostock, Rostock, Germany
| | - Haijun Jiao
- Leibniz-Institut für Katalyse (LIKAT), Rostock, Germany
| | - Peter Langer
- Leibniz-Institut für Katalyse (LIKAT), Rostock, Germany
- Institut für Chemie, Universität Rostock, Rostock, Germany
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Devi M, Singh R, Sindhu J, Kumar A, Lal S, Kumar R, Hussain K, Sachdeva M, Singh D, Kumar P. Sonochemical Protocols for Heterocyclic Synthesis: A Representative Review. Top Curr Chem (Cham) 2022; 380:14. [PMID: 35149908 DOI: 10.1007/s41061-022-00369-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Accepted: 01/23/2022] [Indexed: 11/30/2022]
Abstract
In the present era of the industrial revolution, we all are familiar with ever-increasing environmental pollution released from various chemical processes. Chemical production has had a severe impact on the environment and human health. For the betterment of our environment, the chemical community has turned their interest to developing green, harmless and sustainable synthetic processes. To accomplish these goals of green chemistry, the extraordinary properties of sonication play an important role. It is well known that sonochemistry can make decisive contributions to creating high pressures of almost 1000 atm and very high temperatures in the range of 4500-5000 °C. The implementation of ultrasound in chemical transformations somehow fulfils the measures of green chemistry, as it reduces energy consumption, enhances product selectivity, and uses lesser amounts of hazardous chemicals and solvents. Furthermore, heterocyclic synthesis under ultrasonication offers several environmental and process-related advantages compared with conventional methods. The remarkable contribution of ultrasonics to the development of green and sustainable synthetic routes inspired us to write this article. Herein, we have discussed only some of the various synthetic methodologies developed for the construction of heterocyclic cores under ultrasonic irradiation, accompanied by mechanistic insights. In some cases, a comparison between sonochemical conditions and conventional conditions has also been investigated. We emphasized principally 'up to date' developments on various sono-accelerated chemical transformations comprising aza-Michael, aldol reactions, C-C couplings, oxidation, cycloadditions, multi-component reactions, etc. for the synthesis of heterocycles.
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Affiliation(s)
- Meena Devi
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136119, India
| | - Rahul Singh
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136119, India
| | - Jayant Sindhu
- Department of Chemistry, COBS & H, CCS Haryana Agricultural University, Hisar, 125004, India
| | - Ashwani Kumar
- Guru Jambheshwar University of Science and Technology, Department of Pharmaceutical Sciences, Hisar, 125001, India
| | - Sohan Lal
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136119, India
| | - Ramesh Kumar
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136119, India
| | - Khalid Hussain
- Department of Applied Sciences and Humanities, Mewat Engineering College, Nuh, 122107, India
| | - Megha Sachdeva
- Department of Chemistry, Center of Advanced Study in Chemistry, Panjab University, Chandigarh, 160014, India
| | - Devender Singh
- Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India
| | - Parvin Kumar
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136119, India.
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Zhou J, Yu T, Li K, Zeng K, Yang GP, Hu CW. Two U(VI)-Containing Silicotungstates with Sandwich Structures: Lewis Acid–Base Synergistic Catalyzed Synthesis of Benzodiazepines and Pyrazoles. Inorg Chem 2022; 61:3050-3057. [DOI: 10.1021/acs.inorgchem.1c03160] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jie Zhou
- Jiangxi Province Key Laboratory of Synthetic Chemistry, Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang 330013, China
| | - Tao Yu
- Jiangxi Province Key Laboratory of Synthetic Chemistry, Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang 330013, China
| | - Ke Li
- Jiangxi Province Key Laboratory of Synthetic Chemistry, Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang 330013, China
| | - Kai Zeng
- Jiangxi Province Key Laboratory of Synthetic Chemistry, Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang 330013, China
| | - Guo-Ping Yang
- Jiangxi Province Key Laboratory of Synthetic Chemistry, Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang 330013, China
| | - Chang-Wen Hu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China
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Singh RK, Sharda S, Sharma S, Kumar S, Prasad DN. Multicomponent Catalytic Synthesis of 1,5-Benzodiazepines: An Update. MINI-REV ORG CHEM 2020. [DOI: 10.2174/1570193x16666190509074109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
1,5-Benzodiazepines are considered some of the most vital classes of heterocyclic compounds due to their amazing biological and varied pharmacological activities. They are regarded as privileged structures and therefore have been striking synthetic targets for organic and medicinal chemists over the last decade. This results in the exploration of various silica supported catalysts, Lewis acids, organoacids, magnetic nanoparticles and other miscellaneous catalysts that have been investigated till date for an efficient and green synthesis of 1,5-benzodiazepine and its derivatives. The current review article primarily covers the one-pot green chemical synthesis of 1,5- benzodiazepines using various novel catalysts. The main motive of this review is the assessment of the literature on various catalysts along with their yield, reaction condition, and mechanism of action. In the end, the entire catalysts are structured systematically into various Lewis acids, Bronsted organoacids, supported catalysts, nanocatalysts, and miscellaneous catalysts and are presented in the form of tables for quick ‘at a glance’ study of catalysts, their reaction condition, time taken, etc.
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Affiliation(s)
- Rajesh K. Singh
- Department of Pharmaceutical Chemistry, Shivalik College of Pharmacy, Nangal, Dist. Rupnagar, 140126, Punjab, India
| | - Sadhna Sharda
- Department of Pharmaceutical Chemistry, Lovely Professional University, Phagwara, 144411, Punjab, India
| | - Shikha Sharma
- Department of Pharmaceutical Chemistry, Global College of Pharmacy, Kahnpur-Khui, Dist. Ropar, Punjab, India
| | - Sahil Kumar
- Department of Pharmacy, School of Medical and Allied Sciences, GD Goenka University, Sohna, Dist. Gurugram- 122103, Haryana, India
| | - Deo Nandan Prasad
- Department of Pharmaceutical Chemistry, Shivalik College of Pharmacy, Nangal, Dist. Rupnagar, 140126, Punjab, India
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Desens W, Jiao H, Langer P, Michalik D. NMR Spectroscopic and Theoretical Studies on Tautomerism and Isomerism of Perfluoroalkyl‐Substituted 1,5‐Benzodiazepines. ChemistrySelect 2020. [DOI: 10.1002/slct.201904639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Willi Desens
- Institut für ChemieUniversität Rostock Albert-Einstein-Str. 3a Rostock 18059 Germany
| | - Haijun Jiao
- Leibniz-Institut für Katalyse (LIKAT) Albert-Einstein-Str. 29a Rostock 18059 Germany
| | - Peter Langer
- Institut für ChemieUniversität Rostock Albert-Einstein-Str. 3a Rostock 18059 Germany
- Leibniz-Institut für Katalyse (LIKAT) Albert-Einstein-Str. 29a Rostock 18059 Germany
| | - Dirk Michalik
- Institut für ChemieUniversität Rostock Albert-Einstein-Str. 3a Rostock 18059 Germany
- Leibniz-Institut für Katalyse (LIKAT) Albert-Einstein-Str. 29a Rostock 18059 Germany
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Janciene R, Mikulskiene G. The complete 1 H and 13 C NMR spectra assignments of N-(2-nitrobenzoyl)-1,5-benzodiazepin-2-one and dihydroquinazolino[3,2-α]benzodiazepine derivatives. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2019; 57:968-974. [PMID: 31325185 DOI: 10.1002/mrc.4924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 05/24/2019] [Accepted: 07/11/2019] [Indexed: 06/10/2023]
Affiliation(s)
- Regina Janciene
- Vilnius University Life Sciences Center, Institute of Biochemistry, Vilnius, Lithuania
| | - Gema Mikulskiene
- Vilnius University Life Sciences Center, Institute of Biochemistry, Vilnius, Lithuania
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7
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Desens W, Jiao H, Langer P, Michalik D. NMR spectroscopic and theoretical studies on the isomerism of 1,5-benzodiazepin-2-one derivatives containing a perfluorinated side chain. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.06.044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sharghi H, Aboonajmi J, Mozaffari M, Doroodmand MM, Aberi M. Application and developing of iron‐doped multi‐walled carbon nanotubes (Fe/MWCNTs) as an efficient and reusable heterogeneous nanocatalyst in the synthesis of heterocyclic compounds. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.4124] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Hashem Sharghi
- Department of Chemistry, College of SciencesShiraz University Shiraz 71454 Iran
| | - Jasem Aboonajmi
- Department of Chemistry, College of SciencesShiraz University Shiraz 71454 Iran
| | - Mozhdeh Mozaffari
- Department of Chemistry, College of SciencesShiraz University Shiraz 71454 Iran
| | | | - Mahdi Aberi
- Department of Chemistry, College of SciencesShiraz University Shiraz 71454 Iran
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Chemo-/regio-selective synthesis of 2-aryl-3-acetyl-2,4-dihydro-1H-5H-1,5-benzodiazepines using Lewis acid, CeCl3·7H2O. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.11.089] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Ponra S, Majumdar KC. Brønsted acid-promoted synthesis of common heterocycles and related bio-active and functional molecules. RSC Adv 2016. [DOI: 10.1039/c5ra27069c] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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11
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Semenov VA, Samultsev DO, Rulev AY, Krivdin LB. Theoretical and experimental (15)N NMR study of enamine-imine tautomerism of 4-trifluoromethyl[b]benzo-1,4-diazepine system. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2015; 53:1031-1034. [PMID: 26290420 DOI: 10.1002/mrc.4296] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 06/16/2015] [Accepted: 06/17/2015] [Indexed: 06/04/2023]
Abstract
The tautomeric structure of 4-trifluoromethyl[b]benzo-1,4-diazepine system in solution has been evaluated by means of the calculation of (15)N NMR chemical shifts of individual tautomers in comparison with the averaged experimental shifts to show that the enamine-imine equilibrium is entirely shifted toward the imine form. The adequacy of the theoretical level used for the computation of (15)N NMR chemical shifts in this case has been verified based on the benchmark calculations in the series of the push-pull and captodative enamines together with related azomethynes, which demonstrated a good to excellent agreement with experiment.
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Affiliation(s)
- Valentin A Semenov
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky St. 1, 664033, Irkutsk, Russia
| | - Dmitry O Samultsev
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky St. 1, 664033, Irkutsk, Russia
| | - Alexander Yu Rulev
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky St. 1, 664033, Irkutsk, Russia
| | - Leonid B Krivdin
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky St. 1, 664033, Irkutsk, Russia
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12
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Romanov AR, Rulev AY, Ushakov IA, Muzalevskiy VM, Nenajdenko VG. Synthesis of trifluoromethylated [1,4]diazepines from 1,1,1-trifluoroalk-3-yn-2-ones. MENDELEEV COMMUNICATIONS 2014. [DOI: 10.1016/j.mencom.2014.09.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Patil R, Bhoir P, Deshpande P, Wattamwar T, Shirude M, Chaskar P. Relevance of sonochemistry or ultrasound (US) as a proficient means for the synthesis of fused heterocycles. ULTRASONICS SONOCHEMISTRY 2013; 20:1327-1336. [PMID: 23669313 DOI: 10.1016/j.ultsonch.2013.04.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2012] [Revised: 04/03/2013] [Accepted: 04/04/2013] [Indexed: 06/02/2023]
Abstract
Medicinal chemistry has been benefited by combinatorial chemistry and high throughput parallel synthesis. The use of sonochemistry under controlled conditions has been proved beneficial for medicinal chemistry and drug discovery process since it dramatically reduces reaction times, from days or hours to minutes. In addition, sonochemistry synthesis provides higher yields, lower cost, easy workups and greater purity as compared to lower yields, tedious workups, longer reaction times, lesser purity and termination of many by-products in the conventional thermal methods.
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Affiliation(s)
- Rajashree Patil
- Department of Pharmaceutical Chemistry, Yadavrao Tasgaonkar Institute of Pharmacy, Chandhai, Bhivpuri Road, Karjat, Maharashtra, India
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Babu M, Pitchumani K, Ramesh P. Synthesis of 5-benzyl-4-aryl-octahydro-1H-benzo[b][1,5]diazepin-2-ones as potent antidepressant and antimicrobial agents. Med Chem Res 2013. [DOI: 10.1007/s00044-013-0694-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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16
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Eleftheriadis N, Neochoritis CG, Tsoleridis CA, Stephanidou-Stephanatou J, Iakovidou-Kritsi Z. One-pot microwave assisted synthesis of new 2-alkoxycarbonylmethylene-4-oxo-1,5-benzo-, naphtho-, and pyridodiazepines and assessment of their cytogenetic activity. Eur J Med Chem 2013; 67:302-9. [DOI: 10.1016/j.ejmech.2013.06.028] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 06/06/2013] [Accepted: 06/08/2013] [Indexed: 11/30/2022]
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17
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Prakash GS, Paknia F, Narayan A, Mathew T, Olah GA. Synthesis of perimidine and 1,5-benzodiazepine derivatives using tamed Brønsted acid, BF3–H2O. J Fluor Chem 2013. [DOI: 10.1016/j.jfluchem.2013.03.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Shekouhy M, Hasaninejad A. Ultrasound-promoted catalyst-free one-pot four component synthesis of 2H-indazolo[2,1-b]phthalazine-triones in neutral ionic liquid 1-butyl-3-methylimidazolium bromide. ULTRASONICS SONOCHEMISTRY 2012; 19:307-313. [PMID: 21868275 DOI: 10.1016/j.ultsonch.2011.07.011] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2011] [Revised: 07/14/2011] [Accepted: 07/25/2011] [Indexed: 05/31/2023]
Abstract
A catalyst-free one-pot four component methodology for the synthesis of 2H-indazolo[2,1-b]phthalazine-triones under ultrasonic irradiation at room temperature using 1-butyl-3-methylimidazolium bromide, [Bmim]Br, as a neutral reaction medium is described. A broad range of structurally diverse aldehydes (aromatic aldehydes bearing electron withdrawing and/or electron releasing groups as well as heteroaromatic aldehydes) were applied successfully, and corresponding products were obtained in good to excellent yields without any byproduct.
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Affiliation(s)
- Mohsen Shekouhy
- College of Chemistry, Islamic Azad University, Bandar Abbas Branch, Hormozgan, Iran.
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Shinde PV, Shingate BB, Shingare MS. An Organocatalyzed and Ultrasound Accelerated Expeditious Synthetic Route to 1,5-Benzodiazepines under Solvent-Free Conditions. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.4.1179] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ruiz E, Rodríguez H, Coro J, Salfrán E, Suárez M, Martínez-Alvarez R, Martín N. Ultrasound-assisted one-pot, four component synthesis of 4-aryl 3,4-dihydropyridone derivatives. ULTRASONICS SONOCHEMISTRY 2011; 18:32-36. [PMID: 20510640 DOI: 10.1016/j.ultsonch.2010.04.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 04/21/2010] [Accepted: 04/26/2010] [Indexed: 05/29/2023]
Abstract
The condensation of Meldrum's acid, aromatic aldehydes, alkyl acetoacetates and ammonium acetate in glacial acetic acid under ultrasound irradiation at room temperature results in the formation of 3,4-dihydropyridone derivatives (4a-p) in 85-96% yields. Compared with conventional methods, the main advantages of the present procedure are milder conditions, shorter reaction times and higher yields.
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Affiliation(s)
- Enrique Ruiz
- Laboratorio de Síntesis Orgánica, Facultad de Química, Universidad de La Habana, 10400-Ciudad Habana, Cuba
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Neochoritis CG, Tsoleridis CA, Stephanidou-Stephanatou J, Kontogiorgis CA, Hadjipavlou-Litina DJ. 1,5-Benzoxazepines vs 1,5-Benzodiazepines. One-Pot Microwave-Assisted Synthesis and Evaluation for Antioxidant Activity and Lipid Peroxidation Inhibition. J Med Chem 2010; 53:8409-20. [DOI: 10.1021/jm100739n] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Constantinos G. Neochoritis
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Macedonia, Greece
| | - Constantinos A. Tsoleridis
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Macedonia, Greece
| | - Julia Stephanidou-Stephanatou
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Macedonia, Greece
| | - Christos A. Kontogiorgis
- Department of Pharmaceutical Chemistry, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki 54124, Macedonia, Greece
| | - Dimitra J. Hadjipavlou-Litina
- Department of Pharmaceutical Chemistry, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki 54124, Macedonia, Greece
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Murai K, Nakatani R, Kita Y, Fujioka H. One-pot three-component reaction providing 1,5-benzodiazepine derivatives. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.09.076] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Mahajan D, Naqvi T, Sharma RL, Kapoor KK. Alum-Catalyzed One-Pot Solventless Synthesis of 1,5-Benzodiazepines. Aust J Chem 2008. [DOI: 10.1071/ch07316] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Alum [KAl(SO4)2∙12H2O] was found to be an efficient, non-toxic, cheap, and environmentally benign catalyst for the synthesis of 1,5-benzodiazepines, in good to excellent yields, from the condensation of 1 mole of o-phenylenediamine with 2 moles of ketone under solvent-free conditions.
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