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Salem MSH, Sharma R, Suzuki S, Imai Y, Arisawa M, Takizawa S. Impact of helical elongation of symmetric oxa[n]helicenes on their structural, photophysical, and chiroptical characteristics. Chirality 2024; 36:e23673. [PMID: 38698568 DOI: 10.1002/chir.23673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2024] [Revised: 04/08/2024] [Accepted: 04/09/2024] [Indexed: 05/05/2024]
Abstract
The adjustment of the main helical scaffold in helicenes is a fundamental strategy for modulating their optical features, thereby enhancing their potential for diverse applications. This work explores the influence of helical elongation (n = 5-9) on the structural, photophysical, and chiroptical features of symmetric oxa[n]helicenes. Crystal structure analyses revealed structural variations with helical extension, impacting torsion angles, helical pitch, and packing arrangements. Through theoretical investigations using density functional theory (DFT) calculations, the impact of helical extension on aromaticity, planarity distortion, and heightened chiral stability were discussed. Photophysical features were studied through spectrophotometric analysis, with insights gained through time-dependent DFT (TD-DFT) calculations. Following optical resolution via chiral high-performance liquid chromatography (HPLC), the chiroptical properties of both enantiomers of oxa[7]helicene and oxa[9]helicene were investigated. A slight variation in the main helical scaffold of oxa[n]helicenes from [7] to [9] induced an approximately three-fold increase in dissymmetry factors with the biggest values of|glum| of oxa[9]helicene (2.2 × 10-3) compared to|glum|of oxa[7]helicene (0.8 × 10-3), findings discussed and supported by TD-DFT calculations.
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Grants
- 24K17681 Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
- 21A204 Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
- 21H05217 Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
- 22K06502 Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS)
- JPMJCR20R1 Core Research for Evolutionary Science and Technology (JST CREST)
- Hoansha Foundation
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Affiliation(s)
- Mohamed S H Salem
- SANKEN, Osaka University, Osaka, Japan
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt
| | - Rubal Sharma
- SANKEN, Osaka University, Osaka, Japan
- Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan
| | - Seika Suzuki
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Osaka, Higashi-Osaka, Japan
| | - Yoshitane Imai
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Osaka, Higashi-Osaka, Japan
| | - Mitsuhiro Arisawa
- Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan
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Khalid MI, Salem MSH, Takizawa S. Synthesis and Structural and Optical Behavior of Dehydrohelicene-Containing Polycyclic Compounds. Molecules 2024; 29:296. [PMID: 38257209 PMCID: PMC10819569 DOI: 10.3390/molecules29020296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/28/2023] [Accepted: 01/03/2024] [Indexed: 01/24/2024] Open
Abstract
Dehydrohelicene-based molecules stand out as highly promising scaffolds and captivating chiroptical materials, characterized by their unique chirality. Their quasi-helical π-conjugated molecular architecture, featuring successively ortho-annulated aromatic rings, endows them with remarkable thermal stability and optical properties. Over the past decade, diverse approaches have emerged for synthesizing these scaffolds, reinvigorating this field, with anticipated increased attention in the coming years. This review provides a comprehensive overview of the historical evolution of dehydrohelicene chemistry since the pioneering work of Zander and Franke in 1969 and highlights recent advancements in the synthesis of various molecules incorporating dehydrohelicene motifs. We elucidate the intriguing structural features and optical merits of these molecules, occasionally drawing comparisons with their helicene or circulene analogs to underscore the significance of the bond between the helical termini.
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Affiliation(s)
- Md. Imrul Khalid
- SANKEN, Osaka University, Mihogaoka, Ibaraki-shi 567-0047, Osaka, Japan; (M.I.K.); (M.S.H.S.)
- Organic and Carbon Nanomaterials Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Kunigami-gun, Okinawa 904-0495, Japan
| | - Mohamed S. H. Salem
- SANKEN, Osaka University, Mihogaoka, Ibaraki-shi 567-0047, Osaka, Japan; (M.I.K.); (M.S.H.S.)
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Suez Canal University, Ismailia 41522, Egypt
| | - Shinobu Takizawa
- SANKEN, Osaka University, Mihogaoka, Ibaraki-shi 567-0047, Osaka, Japan; (M.I.K.); (M.S.H.S.)
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Salem MSH, Khalid MI, SAKO M, Higashida K, Lacroix C, Kondo M, Takishima R, Taniguchi T, Miura M, Vo-Thanh G, Sasai H, Takizawa S. Synthesis of Hetero[7]helicenes Containing Pyrrole and Furan Rings <i>via</i> an Oxidative Heterocoupling and Dehydrative Cyclization Sequence. Adv Synth Catal 2023. [DOI: 10.1002/adsc.202201262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
| | | | | | | | | | - Masaru Kondo
- Osaka University Institute of Science and Industrial Research JAPAN
| | | | | | | | - Giang Vo-Thanh
- Universite Paris-Saclay Faculte des Sciences d'Orsay FRANCE
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Salem MSH, Sabri A, Khalid MI, Sasai H, Takizawa S. Two-Step Synthesis, Structure, and Optical Features of a Double Hetero[7]helicene. Molecules 2022; 27:molecules27249068. [PMID: 36558201 PMCID: PMC9785389 DOI: 10.3390/molecules27249068] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/14/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022]
Abstract
A novel double aza-oxa[7]helicene was synthesized from the commercially available N1,N4-di(naphthalen-2-yl)benzene-1,4-diamine and p-benzoquinone in two steps. Combining the acid-mediated annulation with the electrochemical sequential reaction (oxidative coupling and dehydrative cyclization) afforded this double hetero[7]helicene. Moreover, the structural and optical features of this molecule have been studied using X-ray crystallographic analysis, and the absorption and emission behaviors were rationalized based on DFT calculations.
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Affiliation(s)
- Mohamed S. H. Salem
- SANKEN, Osaka University, Ibaraki-shi, Osaka 567-0047, Japan
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Suez Canal University, Ismailia 41522, Egypt
| | - Ahmed Sabri
- SANKEN, Osaka University, Ibaraki-shi, Osaka 567-0047, Japan
| | | | - Hiroaki Sasai
- SANKEN, Osaka University, Ibaraki-shi, Osaka 567-0047, Japan
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita-shi, Osaka 565-0871, Japan
| | - Shinobu Takizawa
- SANKEN, Osaka University, Ibaraki-shi, Osaka 567-0047, Japan
- Correspondence: ; Tel.: +81-6-6879-8467
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Khalid MI, Salem MSH, Sako M, Kondo M, Sasai H, Takizawa S. Electrochemical synthesis of heterodehydro[7]helicenes. Commun Chem 2022; 5:166. [PMID: 36697698 PMCID: PMC9814689 DOI: 10.1038/s42004-022-00780-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 11/15/2022] [Indexed: 12/07/2022] Open
Abstract
Dehydrohelicenes are some of the most attractive chiroptical materials with unique helical chirality. However, to our knowledge, there are no prior reports on their direct construction by asymmetric methods. In this work, sequential synthesis of aza-oxa-dehydro[7]helicenes via the electrochemical oxidative hetero-coupling of 3-hydoxycarbazoles and 2-naphthols followed by dehydrative cyclization and intramolecular C-C bond formation has been realized. In addition, an efficient enantioselective synthesis through chiral vanadium-catalyzed hetero-coupling and electrochemical oxidative transformations afforded heterodehydro[7]helicene without any racemization. The obtained dehydro[7]helicenes showed intense blue-colored circularly polarized luminescence (|glum| ≈ 2.5 × 10-3 at 433 nm). Thermodynamic and kinetic studies of the racemization barrier of heterodehydro[7]helicenes indicated significant chiral stability with ΔG‡> 140 kJ mol-1.
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Affiliation(s)
- Md. Imrul Khalid
- grid.136593.b0000 0004 0373 3971SANKEN, Osaka University, Mihogaoka, Ibaraki-shi, Osaka, 567-0047 Japan
| | - Mohamed S. H. Salem
- grid.136593.b0000 0004 0373 3971SANKEN, Osaka University, Mihogaoka, Ibaraki-shi, Osaka, 567-0047 Japan ,grid.33003.330000 0000 9889 5690Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Suez Canal University, Ismailia, 41522 Egypt
| | - Makoto Sako
- grid.136593.b0000 0004 0373 3971Graduate School of Pharmaceutical Sciences, Osaka University, Yamada-oka, Suita-shi, Osaka, 565-0871 Japan
| | - Masaru Kondo
- grid.410773.60000 0000 9949 0476Department of Materials Science and Engineering, Graduate School of Science and Engineering, Ibaraki University, Naka-narusawa, Hitachi, Ibaraki, 316-8511 Japan
| | - Hiroaki Sasai
- grid.136593.b0000 0004 0373 3971SANKEN, Osaka University, Mihogaoka, Ibaraki-shi, Osaka, 567-0047 Japan ,grid.136593.b0000 0004 0373 3971Graduate School of Pharmaceutical Sciences, Osaka University, Yamada-oka, Suita-shi, Osaka, 565-0871 Japan
| | - Shinobu Takizawa
- grid.136593.b0000 0004 0373 3971SANKEN, Osaka University, Mihogaoka, Ibaraki-shi, Osaka, 567-0047 Japan
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Salem MSH, Takizawa S. New anionic cobalt(III) complexes enable enantioselective synthesis of spiro-fused oxazoline and iodoacetal derivatives. Front Chem 2022; 10:1034291. [PMID: 36311431 PMCID: PMC9606352 DOI: 10.3389/fchem.2022.1034291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 09/20/2022] [Indexed: 11/30/2022] Open
Abstract
Anionic salicylimine-based cobalt (III) complexes featuring chiral ligands derived from isoleucine amino acids were used as efficient bifunctional phase-transfer catalysts for electrophilic iodination of enol ethers. The Brønsted acids of these complexes enabled the enantioselective asymmetric iodocyclization of enol ethers, furnishing spiro-fused oxazoline derivatives in high yields with up to 90:10 er. In addition, chiral cobalt (III) complexes catalyze the asymmetric intermolecular iodoacetalization of enol ethers with various alcohols to afford 3-iodoacetal derivatives in high yields with up to 92:8 er.
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Affiliation(s)
- Mohamed S. H. Salem
- SANKEN, Osaka University, Ibaraki, Japan
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt
- *Correspondence: Mohamed S. H. Salem, ; Shinobu Takizawa,
| | - Shinobu Takizawa
- SANKEN, Osaka University, Ibaraki, Japan
- *Correspondence: Mohamed S. H. Salem, ; Shinobu Takizawa,
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Kirihara M, Nakamura R, Nakakura K, Tujimoto K, Salem MSH, Suzuki T, Takizawa S. DAST-mediated ring-opening of cyclopropyl silyl ethers in nitriles: facile synthesis of allylic amides via a Ritter-type process. Org Biomol Chem 2022; 20:6558-6561. [PMID: 35900043 DOI: 10.1039/d2ob00940d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A diethylaminosulfur trifluoride (DAST)-mediated ring-opening reaction of cyclopropyl silyl ethers in nitriles produced allylic amides in moderate to good yields (up to 87%). Time course studies using ReactIR and O-isotopic labeling mechanistic studies suggested that the present reaction occurs via a Ritter-type process, leading to the formation of allylic amides.
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Affiliation(s)
- Masayuki Kirihara
- Department of Materials and Life Science, Shizuoka Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, Shizuoka 437-8555, Japan.
| | - Riho Nakamura
- Department of Materials and Life Science, Shizuoka Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, Shizuoka 437-8555, Japan.
| | - Kana Nakakura
- Department of Materials and Life Science, Shizuoka Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, Shizuoka 437-8555, Japan.
| | - Kazuki Tujimoto
- Department of Materials and Life Science, Shizuoka Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, Shizuoka 437-8555, Japan.
| | - Mohamed S H Salem
- SANKEN, Osaka University, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan.,Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Suez Canal University, Ismailia 41522, Egypt
| | - Takeyuki Suzuki
- SANKEN, Osaka University, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Shinobu Takizawa
- SANKEN, Osaka University, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
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Sako M, Kanomata K, Salem MSH, Furukawa T, Sasai H, Takizawa S. Metal-free C(aryl)–P bond cleavage: Experimental and computational studies of the Michael addition/aryl migration of triarylphosphines to alkenyl esters. Org Chem Front 2022. [DOI: 10.1039/d2qo00028h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The nucleophilic addition and aryl migration of triarylphosphines to alkynyl esters in the presence of water results in the formation of 3-(diarylphosphoryl)-3-aryl propanoic acid derivatives through a metal-free C(aryl)–P bond...
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Kamble GT, Salem MSH, Abe T, Park H, Sako M, Takizawa S, Sasai H. Chiral Vanadium(V)-catalyzed Oxidative Coupling of 4-Hydroxycarbazoles. CHEM LETT 2021. [DOI: 10.1246/cl.210367] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Ganesh T. Kamble
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Mohamed S. H. Salem
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Suez Canal University, Ismailia 41522, Egypt
| | - Tsukasa Abe
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Hanseok Park
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Makoto Sako
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Shinobu Takizawa
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Hiroaki Sasai
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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Gardouh AR, Srag El-Din ASG, Salem MSH, Moustafa Y, Gad S. Starch Nanoparticles for Enhancement of Oral Bioavailability of a Newly Synthesized Thienopyrimidine Derivative with Anti-Proliferative Activity Against Pancreatic Cancer. Drug Des Devel Ther 2021; 15:3071-3093. [PMID: 34305395 PMCID: PMC8292977 DOI: 10.2147/dddt.s321962] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 07/08/2021] [Indexed: 01/02/2023]
Abstract
Purpose This research aimed to improve water solubility and oral bioavailability of a newly synthesized thienopyrimidine derivative (TPD) with anti-pancreatic cancer activity by loading on starch nanoparticles (SNPs). Methods TPD was synthesized, purified and its ADME behavior was predicted using Swiss ADME software. A UV spectroscopy method was developed and validated to measure TPD concentration at various dosage forms. SNPs loaded with TPD (SNPs-TPD) were prepared, characterized for particle size, polydispersity index, zeta potential, transmission electron microscopy, Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), entrapment efficiency, in-vitro release, and in-vivo animal study. Results The Swiss ADME results showed that TPD can be administered orally; however, it has low oral bioavailability (0.55) and poor water solubility. The significant regression coefficient of the calibration curve (r2 = 0.9995), the precision (%RSD < 0.5%) and the accuracy (99.46−101.72%) confirmed the efficacy of the developed UV method. SNPs-TPD had a spherical monodispersed (PDI= 0.12) shape, nanoparticle size (22.98 ± 4.23) and good stability (−21 ± 4.72 mV). Moreover, FT-IR and DSC revealed changes in the physicochemical structure of starch resulting in SNPs formation. The entrapment efficiency was 97% ± 0.45%, and the in-vitro release showed that the SNPs enhanced the solubility of the TPD. The in-vivo animal study and histopathology showed that SNPs enhanced the oral bioavailability of TPD against solid Ehrlich carcinoma. Conclusion SNPs-TPD were superior in drug solubility and oral bioavailability than those obtained from TPD suspension.
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Affiliation(s)
- Ahmed R Gardouh
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt.,Department of Pharmaceutical Sciences, Faculty of Pharmacy, Jadara University, Irbid, 21110, Jordan
| | - Ahmed S G Srag El-Din
- Department of Pharmaceutics, Faculty of Pharmacy, Delta University for Science & Technology, Gamasa City, Egypt
| | - Mohamed S H Salem
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Suez Canal University, Ismailia, 41522, Egypt.,The Institute of Scientific and Industrial Research (ISIR), Osaka University, Ibaraki-shi, Osaka, 567-0047, Japan
| | - Yasser Moustafa
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt.,Department of Pharmacology and Toxicology, Faculty of Pharmacy, Badr University in Cairo, Badr City, Cairo, Egypt
| | - Shadeed Gad
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt
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Takizawa S, Sasai H, S. H. Salem M, Kumar A, Sako M, Abe T. Preparation of Optically Pure Dinuclear Cobalt(III) Complex with Λ-Configuration as a Dianionic Chiral Catalyst. HETEROCYCLES 2021. [DOI: 10.3987/com-20-s(k)41] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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