1
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Ghanbari MM, Jamali M, Batta G, Bényei AC. Synthesis and dynamic NMR studies of novel hydantoin and thiohydantoin derivatives. Crystal structure of diethyl 2-(4,4-diaryl-2,5-dioxoimidazolidin-1-yl) fumarate and diethyl 2-(4,4-diaryl-2-mercapto-5-oxo-4,5-dihydro-1 H-imidazol-1-yl)fumarate. JOURNAL OF CHEMICAL RESEARCH 2017. [DOI: 10.3184/174751917x14932244903881] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The reaction of stoichiometric amounts of dialkyl acetylenedicarboxylates with triphenylphosphine in the presence of hydantoins or thiohydantoins afforded stable crystalline phosphorus ylides. These compounds undergo smooth elimination of PPh3 to produce dialkyl 2-(4,4-diaryl-2,5-dioxoimidazolidin-1-yl)fumarate, 4 or dialkyl 2-(4,4-diaryl-2-mercapto-5-oxo-4,5-dihydro-1 H-imidazol-1-yl)fumarate, 7. Single crystal X-ray diffraction study on 4b and 7b proved the structures unambiguously with C=O and SH functionality at the 2-position of the imidazole ring, respectively. Dynamic effects were observed in the NMR spectra of these compounds and were attributed to restricted rotation around the carbon-nitrogen single bonds. Rotational energy barrier (Δ G#) for their interconversion process of rotational isomers equals to (53.6 and 17.2) ± 2 kcal mol−1.
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Affiliation(s)
- Mohammad M. Ghanbari
- Young Researchers and Elite Club, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
| | - Marzieh Jamali
- Young Researchers and Elite Club, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
| | - Gyula Batta
- Department of Organic Chemistry, University of Debrecen, Hungary
| | - Attila C. Bényei
- Department of Physical Chemistry, University of Debrecen, Hungary
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Ghanbari MM, Jamali M, Batta G. Solvent-free, mild, facile, and rapid one-pot three-component synthesis of some novel imidazo[2,1-b]naphtho[1,2-e][1,3] thiazin-10-ones usingp-TSA. J Sulphur Chem 2014. [DOI: 10.1080/17415993.2014.885031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ghanbari MM, Yavari I, Batta G. Reaction of alkyl isocyanides and dialkyl acetylenedicarboxylates in the presence of 5,5-diaryl thiohydantoins. Synthesis of functionalized imidazo[2,1-b][1,3]thiazines. J Sulphur Chem 2014. [DOI: 10.1080/17415993.2013.879308] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ghanbari MM, Yavari I, Emadi A. Et 3N-Mediated Synthesis of N-Vinylthiohydantoins from 5,5-Diarylthiohydantoins and Acetylenic Esters. JOURNAL OF CHEMICAL RESEARCH 2013. [DOI: 10.3184/174751913x13700860964396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The reactive 1:1 intermediates produced in the addition reactions between triethylamine and acetylenic esters were trapped by thiohydantoins to produce N-vinylthiohydantoins.
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Affiliation(s)
| | - Issa Yavari
- Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Abedin Emadi
- Chemistry Department, Marvdasht Payam Noor University, Marvdasht, Iran
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