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Farghaly TA, Alosaimy AM, Al-Qurashi NT, Masaret GS, Abdulwahab HG. The most Recent Compilation of Reactions of Enaminone Derivatives with various Amine Derivatives to Generate Biologically Active Compounds. Mini Rev Med Chem 2024; 24:793-843. [PMID: 37711104 DOI: 10.2174/1389557523666230913164038] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/23/2023] [Accepted: 07/24/2023] [Indexed: 09/16/2023]
Abstract
Heterocyclic derivatives serve as the fundamental components of both natural and synthetic drugs. Enaminones play a crucial role as foundational units in the synthesis of numerous bioactive heterocyclic compounds, including pyrazoles, pyridines, oxazoles, isoxazoles, as well as fused heterocyclic structures like indoles, carbazoles, quinolines, acridines, and phenanthridines. These diverse heterocyclic rings are well-known for their various therapeutic activities, encompassing anticancer, anti-inflammatory, antimicrobial, antidepressant, and antiviral properties. By reacting with nitrogenbased nucleophiles, enaminones can generate bioactive azoles, azines, and their fused systems. This study focuses on the recent advancements in enaminone reactions with (a) nitrogen-based nucleophiles, such as aliphatic amines, derivatives of aniline, heterocyclic amines, hydroxylamine, hydrazine derivatives, guanidine derivatives, urea, and thiourea derivatives, and (b) nitrogen-based electrophiles, such as diazonium salts. These reactions have led to the synthesis of a wide range of bioactive fused heterocyclic compounds from 2010 to the end of 2022.
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Affiliation(s)
- Thoraya A Farghaly
- Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University, Makkah Almukaramah, Saudi Arabia
| | - Amal M Alosaimy
- Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University, Makkah Almukaramah, Saudi Arabia
| | - Nadia T Al-Qurashi
- Department of Basic Science, University College in Adam, Umm Al-Qura University, Makkah Almukkarramah, Saudi Arabia
| | - Ghada S Masaret
- Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University, Makkah Almukaramah, Saudi Arabia
| | - Hanan Gaber Abdulwahab
- Department of Pharmaceutical Medicinal Chemistry and Drug Design, Faculty of Pharmacy (Girls), Al-Azhar University, Cairo, Egypt
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2
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Tang BD, Zhang JY, Ma HX, Wang N, An X, Li GM, Zhou Z. SYNTHESIS, CRYSTAL STRUCTURE, AND DFT STUDY OF 1-(PYRROLIDIN-1- YL-METHYL)-4-(THIOPHEN-2-YL-METHYL)- [1,2,4]TRIAZOLO[4,3-a]QUINAZOLIN-5(4H)-ONE. J STRUCT CHEM+ 2022. [DOI: 10.1134/s0022476622010036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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Zhukovskaya ON, Morkovnik AS, Borodkin GS. 1-Allyl- and 1-(2-Bromopropyl)-2-amino-3-carboxy(carbalkoxy)methylbenzimidazolium Quaternary Salts in the Synthesis of Imidazo[1,2-a]benzimidazole Derivatives. RUSS J GEN CHEM+ 2021. [DOI: 10.1134/s1070363221070033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Abu-Hashem AA, El-Shazly M. Synthesis and Antimicrobial Evaluation of Novel Triazole, Tetrazole, and Spiropyrimidine-Thiadiazole Derivatives. Polycycl Aromat Compd 2021. [DOI: 10.1080/10406638.2019.1598448] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Ameen A. Abu-Hashem
- Photochemistry Department (Heterocyclic Unit), National Research Centre, Dokki, Giza, Egypt
- Chemistry Department, Faculty of Science, Jazan University, Jazan, Saudi Arabia
| | - Mohamed El-Shazly
- Department of Pharmacognosy and Natural Products Chemistry Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
- Department of Pharmaceutical Biology Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo, Egypt
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5
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Deepthi A, Thomas NV, Sruthi SL. An overview of the reactions involving azomethine imines over half a decade. NEW J CHEM 2021. [DOI: 10.1039/d1nj01090e] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Azomethine imines constitute a versatile class of 1,3-dipoles which was used extensively for biologically relevant N-heterocycle synthesis – a five-year recap.
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Affiliation(s)
- Ani Deepthi
- Department of Chemistry
- University of Kerala
- Thiruvananthapuram 695581
- India
| | - Noble V. Thomas
- Department of Chemistry
- University of Kerala
- Thiruvananthapuram 695581
- India
| | - S. L. Sruthi
- Department of Chemistry
- University of Kerala
- Thiruvananthapuram 695581
- India
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6
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El‐Mekabaty A, Etman HA, Mosbah A, Fadda AA. Synthesis, In Vitro Cytotoxicity and Bleomycin‐Dependent DNA Damage Evaluation of Some Heterocyclic‐Fused Pyrimidinone Derivatives. ChemistrySelect 2020. [DOI: 10.1002/slct.202001006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ahmed El‐Mekabaty
- Department: ChemistryInstitution: Faculty of ScienceMansoura UniversityMansoura (Egypt)Address 1: Chemistry DepartmentFaculty of ScienceMansoura University El-Gomhoria Street ET 35516 Mansoura Egypt
| | - Hassan A. Etman
- Department: ChemistryInstitution: Faculty of ScienceMansoura UniversityMansoura (Egypt)Address 1: Chemistry DepartmentFaculty of ScienceMansoura University El-Gomhoria Street ET 35516 Mansoura Egypt
| | - Ahmed Mosbah
- Department: ChemistryInstitution: Faculty of ScienceMansoura UniversityMansoura (Egypt)Address 1: Chemistry DepartmentFaculty of ScienceMansoura University El-Gomhoria Street ET 35516 Mansoura Egypt
| | - Ahmed A. Fadda
- Department: ChemistryInstitution: Faculty of ScienceMansoura UniversityMansoura (Egypt)Address 1: Chemistry DepartmentFaculty of ScienceMansoura University El-Gomhoria Street ET 35516 Mansoura Egypt
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7
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El-Deeb MA, El-Zoghbi MS. Synthesis and Anticancer Activity Study of Some Novel Substituted and Fused Pyridotriazepine Derivatives. J Heterocycl Chem 2018. [DOI: 10.1002/jhet.3447] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Moshira A. El-Deeb
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy (Girls); Al-Azhar University; Cairo Egypt
| | - Mona S. El-Zoghbi
- Pharmaceutical Chemistry Department, Faculty of Pharmacy; Menoufia University; Menoufia Egypt
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8
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Afsah EM, El‐Desoky EI, Etman HA, Youssef I, Soliman AM. Mannich Reaction with Enaminones: Convenient Synthesis of Functionalized Tetrahydro‐pyrimidines, Dihydro‐1,3‐oxazines, and Dihydro‐1,2,4‐triazepines. J Heterocycl Chem 2018. [DOI: 10.1002/jhet.3377] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Elsayed M. Afsah
- Chemistry Department, Faculty of ScienceMansoura University Mansoura ET‐35516 Egypt
| | | | - Hassan A. Etman
- Chemistry Department, Faculty of ScienceMansoura University Mansoura ET‐35516 Egypt
| | - Ibrahim Youssef
- Chemistry Department, Faculty of ScienceMansoura University Mansoura ET‐35516 Egypt
| | - Ahbarah M. Soliman
- Chemistry Department, Faculty of ScienceMansoura University Mansoura ET‐35516 Egypt
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Abu-Hashem AA. Synthesis of New Furothiazolo Pyrimido Quinazolinones from Visnagenone or Khellinone and Antimicrobial Activity. Molecules 2018; 23:molecules23112793. [PMID: 30373270 PMCID: PMC6278323 DOI: 10.3390/molecules23112793] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 10/23/2018] [Accepted: 10/24/2018] [Indexed: 11/16/2022] Open
Abstract
Substituted-6-methyl-1-thioxo-1,2-dihydro-3H-furo[3,2-g]pyrimido[1,6-a]quinazolin-3-ones (5a,b) were synthesized from condensation of visnagenone (2a) or khellinone (2b) with 6-amino-thiouracil (3) in dimethylformamide or refluxing of (4a) or (4b) in dimethylformamide. Hence, compounds (5a,b) were used as the starting materials for preparing many new heterocyclic compounds such as; furo[3,2-g]pyrimido[1,6-a]quinazoline (6a,b), furo[3,2-g]thiazolo[2',3':2,3]pyrimido[1,6-a]quinazolinone (7a,b), substituted-benzylidene-furo[3,2-g]thiazolo[2',3':2,3]pyrimido[1,6-a]quinazoline-3,5-dione (8a⁻f), 3-oxo-furo[3,2-g]pyrimido[1,6-a]quinazoline-pentane-2,4-dione (9a,b), 1-(pyrazole)-furo[3,2-g]pyrimido[1,6-a]quinazolinone (10a,b), 2-(oxo or thioxo)-pyrimidine-furo[3,2-g]pyrimido[1,6-a]quinazolinone (11a⁻d), 1-(methylthio)-furo[3,2-g]pyrimido[1,6-a]quinazolinone (12a,b), 1-(methyl-sulfonyl)-furo[3,2-g]pyrimido[1,6-a]quinazolinone (13a,b) and 6-methyl-1-((piperazine) or morpholino)-3H-furo[3,2-g]pyrimido[1,6-a]quinazolin-3-one (14a⁻d). The structures of the prepared compounds were elucidated on the basis of spectral data (IR, ¹H-NMR, 13C-NMR, MS) and elemental analysis. Antimicrobial activity was evaluated for the synthesized compounds against Gram-positive, Gram-negative bacteria and fungi. The new compounds, furothiazolo pyrimido quinazolines 8a⁻f and 11a⁻d displayed results excellent for growth inhibition of bacteria and fungi.
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Affiliation(s)
- Ameen Ali Abu-Hashem
- Photochemistry Department (Heterocyclic Unit), National Research Centre, Dokki, Giza1 2622, Egypt.
- Chemistry Department, Faculty of Science, Jazan University, 2097 Jazan, Saudi Arabia.
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Mohammadi Zeydi M, Mahmoodi NO. Overview on Developed Synthesis Methods of Triazepane Heterocycles. J CHIN CHEM SOC-TAIP 2017. [DOI: 10.1002/jccs.201700069] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - Nosrat O. Mahmoodi
- Department of Organic Chemistry, Faculty of Sciences; University of Guilan; Rasht Iran
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Synthesis and antitumor activity of benzo[6″,7″]cyclohepta[1″,2″:4′,5′]pyrido[2′,3′-d][1,2,4]triazolo[4,3-a]pyrimidin-5-ones. ARAB J CHEM 2017. [DOI: 10.1016/j.arabjc.2013.06.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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12
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Gomha SM, Abbas EMH, Farghaly TA. Antimicrobial Activity of Novel Tetra- and Penta-azaheterocyclic Ring Systems. J Heterocycl Chem 2016. [DOI: 10.1002/jhet.2632] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sobhi M. Gomha
- Department of Chemistry, Faculty of Science; Cairo University; Giza Egypt
| | - Eman M. H. Abbas
- Department of Chemistry, Natural, and Microbial Products; National Research Center; Dokki Cairo Egypt
| | - Thoraya A. Farghaly
- Department of Chemistry, Faculty of Science; Cairo University; Giza Egypt
- Department of Chemistry, Faculty of Applied Science; Umm Al-Qura University, Makkah Almukkarramah; Mecca Saudi Arabia
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13
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Abstract
This review reports the chemistry of 1,2,4-triazepines. Heterocyclic 1,2,4-triazepines are mono and fused cycles.
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Affiliation(s)
- Khaled M. Elattar
- Chemistry Department
- Faculty of Science
- Mansoura University
- Mansoura
- Egypt
| | | | - Ibrahim A. Mousa
- Chemistry Department
- Faculty of Science
- South Valley University
- Egypt
| | - Ahmed El-Mekabaty
- Chemistry Department
- Faculty of Science
- Mansoura University
- Mansoura
- Egypt
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14
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Synthesis, characterization, and pharmacological evaluation of some novel thiadiazoles and thiazoles incorporating pyrazole moiety as anticancer agents. MONATSHEFTE FUR CHEMIE 2014. [DOI: 10.1007/s00706-014-1303-9] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Farghaly TA, Hassaneen HME, Elzahabi HSA. Eco-friendly synthesis and 2D-QSAR study of novel pyrazolines as potential anticolon cancer agents. Med Chem Res 2014. [DOI: 10.1007/s00044-014-1175-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Synthesis of a new series of angiotensin II receptor antagonists and antibacterial agents. Arch Pharm Res 2013; 37:306-14. [PMID: 23709129 DOI: 10.1007/s12272-013-0159-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Accepted: 05/15/2013] [Indexed: 10/26/2022]
Abstract
2-(Arylmethylenehydrazono)-4,4-diphenyl-1H-imidazol-5(4H)-one 3 underwent regioselective cyclization upon treatment with bromine in acetic acid containing sodium acetate to give the respective 3-substituted-6,6-diphenyl-6,7-dihydro-imidazo[2,1-c][1,2,4]triazole-5-one 4 in overall good yields and not the isomeric structure 5. In addition, compound 4 was synthesized by alternative method via reaction of compound 1 with different acids in acetic acid. The synthesized hydrazone derivatives were screened for their angiotensin II receptor antagonists activity and the results showed promising activity. Also, imidazo[2,1-c][1,2,4]triazole-5-ones 4 were screened for the antibacterial activity and the result revealed that two derivatives have excellent activity.
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Gomha SM, Badrey MG. A Convenient Synthesis of Some New Thiazole and Pyrimidine Derivatives Incorporating a Naphthalene Moiety. JOURNAL OF CHEMICAL RESEARCH 2013. [DOI: 10.3184/174751912x13567137687630] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The reaction of 2-[1-(naphthalen-2-yl)ethylidene]hydrazinecarbothioamide with hydrazonoyl halides afforded new thiazole derivatives, whilst reaction with compounds containing an activated double bond such as ethoxymethylene-malononitrile and benzylidenemalononitrile yielded the respective pyrimidine derivatives. A 4-thiazolidin-4-one was obtained by reaction of the hydrazinecarbothioamide with ethyl bromoacetate. Subsequent condensation of the thia-zolidinone with aromatic aldehydes afforded the corresponding arylidene derivatives. Treatment of the hydrazinecarbothioamide with dimethyl acetylenedicarboxylate resulted in the formation of a (methoxycarbonylmethylidene) thiazolinone. Reaction of the hydrazinecarbothioamide with 2-chloro-1,3-dicarbonyl compounds gave the respective thiazole derivatives. The structures of the newly synthesised compounds were confirmed by their elemental analysis and spectral data.
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Affiliation(s)
- Sobhi M. Gomha
- Department of Chemistry, Faculty of Science, University of Cairo, Giza 12613, Egypt
| | - Mohamed G. Badrey
- Chemistry Department, Faculty of Science, Fayoum University, El-Fayoum, Egypt
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Gomha SM, Abdel-Aziz HA. Synthesis of New Heterocycles Derived from 3-(3-Methyl-1H-indol-2-yl)-3-oxopropanenitrile as Potent Antifungal Agents. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.9.2985] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Gomha SM, Khalil KD. A convenient ultrasound-promoted synthesis of some new thiazole derivatives bearing a coumarin nucleus and their cytotoxic activity. Molecules 2012; 17:9335-47. [PMID: 22864241 PMCID: PMC6268604 DOI: 10.3390/molecules17089335] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Revised: 07/18/2012] [Accepted: 07/24/2012] [Indexed: 11/23/2022] Open
Abstract
Successful implementation of ultrasound irradiation for the rapid synthesis of a novel series of 3-[1-(4-substituted-5-(aryldiazenyl)thiazol-2-yl)hydrazono)ethyl]-2H-chromen-2-ones 5a–h, via reactions of 2-(1-(2-oxo-2H-chromen-3-yl)ethylidene) thiosemicarbazide (2) and the hydrazonoyl halides 3(4), was demonstrated. Also, a new series of 5-arylidene-2-(2-(1-(2-oxo-2H-chromen-3-yl)ethylidene)hydrazinyl)thiazol-4(5H)-ones 10a–d were synthesized from reaction of 2 with chloroacetic acid and different aldehydes. Moreover, reaction of 2-cyano-N'-(1-(2-oxo-2H-chromen-3-yl)ethylidene)-acetohydrazide (12) with substituted benzaldehydes gave the respective arylidene derivatives 13a–c under the conditions employed. The structures of the synthesized compounds were assigned based on elemental analyses and spectral data. Also, the cytototoxic activities of the thiazole derivative 5a was evaluated against HaCaT cells (human keratinocytes). It was found that compound 5a possess potent cytotoxic activity.
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Affiliation(s)
- Sobhi M. Gomha
- Department of Chemistry, Faculty of Science, University of Cairo, Giza 12613, Egypt
- Author to whom correspondenceshould be addressed; ; Tel.: +20-237-400-304; Fax: +20-225-685-799
| | - Khaled D. Khalil
- Department of Chemistry, Faculty of Science, University of Cairo, Giza 12613, Egypt
- Chemistry Department, Faculty of Science, University of Kuwait, P.O. Box 5969, Safat 13060, Kuwait;
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M. Gomha S, A. Abdel-Aziz H. Enaminones as Building Blocks in Heterocyclic Preparations: Synthesis of Novel Pyrazoles, Pyrazolo[3,4-d]pyridazines, Pyrazolo[1,5-a]pyrimidines, Pyrido[2,3-d]pyrimidines Linked to Imidazo[2,1-b]thiazole System. HETEROCYCLES 2012. [DOI: 10.3987/com-12-12531] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Farghaly TA, Abdallah MA, Muhammad ZA. Synthesis and evaluation of the anti-microbial activity of new heterocycles containing the 1,3,4-thiadiazole moiety. Molecules 2011; 16:10420-32. [PMID: 22173335 PMCID: PMC6264377 DOI: 10.3390/molecules161210420] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Revised: 12/01/2011] [Accepted: 12/05/2011] [Indexed: 11/16/2022] Open
Abstract
A new series of thiadiazole-enaminones 4 were synthesized via reactions of 5-acetyl-1,3,4-thiadiazoles 3 with dimethylformamide-dimethylacetal (DMF-DMA). The simple phenyl substituted thiadiazole-enaminone 4f was used as a synthetic precursor for the preparation of a wide variety of new heterocyclic compounds, including the 5-substituted-1,3,4-thiadiazole derivatives 5, 6, 11, 12 and 13, which were obtained via reactions of 4f with nitrogen nucleophiles. Also, reactions of enaminone 4f with carbon nucleophiles afforded the respective 1,3,4-thiadiazoles 8a–d. In addition, the results of the antimicrobial activities of thiadiazole-enaminones 4 and their precursors 2 and 3 indicate that some members of this series display promising activities against all tested microorganisms.
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Affiliation(s)
- Thoraya A Farghaly
- Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt.
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Farghaly TA, Gomha SM, Abbas EMH, Abdalla MM. Hydrazonoyl halides as precursors for new fused heterocycles of 5α-reductase inhibitors. Arch Pharm (Weinheim) 2011; 345:117-22. [PMID: 21997851 DOI: 10.1002/ardp.201100212] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Revised: 08/26/2011] [Accepted: 09/01/2011] [Indexed: 11/08/2022]
Abstract
A new series of benzo[6,7]cyclohepta[1,2-d]triazolo[4,3-a]pyrimidines 8a-l was synthesized via reaction of heterocyclic thione 4 or its methyl derivatives 10 with hydrazonoyl halides 5a-l. Also, reaction of compound 4 with a mixture of chloroacetic acid and aromatic aldehyde derivatives gave benzo[6,7]cyclohepta[1,2-d]thiazolo[3,2-a]pyrimidin-3-ones 12-14. The microanalyses and spectral data of the synthesized compounds are in full agreement with their molecular structure. All the newly synthesized products were screened against 5α-reductase and showed activities with good ED(50) for all compounds.
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