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Nomoto A, Okada T, Yamamoto Y, Kuroda S, Marui K, Yamamoto M, Tsujimoto H, Ueshima M, Nishigahana T, Itoh K, Kobata G, Kodama S, Ogawa A. Oxidative Synthesis of Acid Blue 7 Dye Catalyzed by CuO/Silicotungstic Acid in Water-Phase. MATERIALS 2021; 14:ma14164505. [PMID: 34443027 PMCID: PMC8400946 DOI: 10.3390/ma14164505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/31/2021] [Accepted: 08/06/2021] [Indexed: 12/02/2022]
Abstract
A catalytic oxidation reaction for Acid Blue 7 dye synthesis was evaluated in water. Without lead oxide or manganese oxide derivatives as oxidants, polyoxometalate catalysts were investigated to reduce the usage of harmful heavy metal. A catalyst was prepared by mixing silicotungstic acid with copper oxide, and aqueous hydrogen peroxide (30%) was used as an oxidizing agent. This reaction proceeded to produce Acid Blue 7 from the corresponding leuco acid after 45 min at 95 °C and was viable for a 10 g-scale synthesis.
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Kodama S, Yamamoto Y, Kobiki Y, Matsubara H, Tran CC, Kawaguchi SI, Nomoto A, Ogawa A. Transition-Metal-Catalyzed Diarylation of Isocyanides with Triarylbismuthines for the Selective Synthesis of Imine Derivatives. MATERIALS 2021; 14:ma14154271. [PMID: 34361465 PMCID: PMC8348920 DOI: 10.3390/ma14154271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 07/22/2021] [Accepted: 07/28/2021] [Indexed: 11/16/2022]
Abstract
The transition-metal-catalyzed diarylation of isocyanides with triarylbismuthines was investigated in detail, and rhodium catalysts such as [RhCl(nbd)]2 were found to selectively afford N-alkyl diaryl ketimines. On the other hand, palladium-catalyzed diarylation proceeded with the incorporation of two molecules of isocyanide, preferentially yielding N,N’-dialkyl or N,N’-diaryl α-diimines. In addition, a cascade synthesis of 2,3-diarylquinoxalines starting from the palladium-catalyzed diarylation of isocyanides with triarylbismuthines was successfully achieved.
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Yamamoto Y, Kodama S, Nishimura R, Nomoto A, Ueshima M, Ogawa A. One-Pot Construction of Diverse β-Lactam Scaffolds via the Green Oxidation of Amines and Its Application to the Diastereoselective Synthesis of β-Amino Acids. J Org Chem 2021; 86:11571-11582. [PMID: 34319738 DOI: 10.1021/acs.joc.1c01128] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this study, a simple one-pot construction of β-lactam scaffolds was successfully achieved via 4,6-dihydroxysalicylic acid-catalyzed organocatalytic oxidation of amines to imines using molecular oxygen. Although some imines are highly unstable and difficult to isolate by conventional methods, the organocatalytic oxidation of amines described herein, followed by their direct reaction with acyl chlorides in the presence of a base, afforded a series of new β-lactam derivatives with excellent cis selectivity, which could not be synthesized and isolated by previously reported methods. Thus, this one-pot protocol will be one of the powerful methods applicable to the synthesis of various potential drug candidates and functional molecules. Furthermore, the subsequent hydrolysis of these β-lactams successfully afforded the corresponding β-amino acids as almost single diastereomers in up to 99% yields.
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Tran DP, Sato Y, Yamamoto Y, Kawaguchi SI, Kodama S, Nomoto A, Ogawa A. Photoinduced selective hydrophosphinylation of allylic compounds with diphenylphosphine oxide leading to γ-functionalized P-ligand precursors. RESEARCH ON CHEMICAL INTERMEDIATES 2021. [DOI: 10.1007/s11164-021-04433-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Teramoto M, Mizuno T, Imoto M, Takeda M, Nomoto A, Ogawa A. Sulfur-Promoted Redox Cyclization of 2,2′-Dinitrodiphenyl Disulfides and Benzylamines. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/a-1430-5100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractThis study aims to develop green and sustainable advanced synthetic methods based on redox cyclization. Elemental sulfur is shown to promote the efficient synthesis of 2-substituted benzothiazoles from 2,2′-dinitrodiphenyl disulfides and benzylamines via redox cyclization in the absence of transition-metal catalysts and solvents. The 2-substituted benzothiazoles are obtained in good to excellent yields. This synthetic methodology is highly atom-economical and does not require any external oxidizing and/or reducing agents.
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Tran DP, Sato Y, Yamamoto Y, Kawaguchi SI, Kodama S, Nomoto A, Ogawa A. Highly regio- and stereoselective phosphinylphosphination of terminal alkynes with tetraphenyldiphosphine monoxide under radical conditions. Beilstein J Org Chem 2021; 17:866-872. [PMID: 33968259 PMCID: PMC8077611 DOI: 10.3762/bjoc.17.72] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 04/07/2021] [Indexed: 12/26/2022] Open
Abstract
The homolytic cleavage of the PV(O)–PIII bond in tetraphenyldiphosphine monoxide simultaneously provides both pentavalent and trivalent phosphorus-centered radicals with different reactivities. The method using V-40 as an initiator is successfully investigated for the regio- and stereoselective phosphinylphosphination of terminal alkynes giving the corresponding trans-isomers of 1-diphenylphosphinyl-2-diphenylthiophosphinyl-1-alkenes in good yields. The protocol can be applied to a wide variety of terminal alkynes including both alkyl- and arylalkynes.
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Narumi A, Rachi R, Yamazaki H, Kawaguchi S, Kikuchi M, Konno H, Osaki T, Okamoto Y, Shen X, Kakuchi T, Kataoka H, Nomoto A, Yoshimura T, Yano S. Maltotriose-Chlorin e6 Conjugate Linked via Tetraethyleneglycol as an Advanced Photosensitizer for Photodynamic Therapy. Synthesis and Antitumor Activities against Canine and Mouse Mammary Carcinoma Cells. ACS OMEGA 2021; 6:7023-7033. [PMID: 33748616 PMCID: PMC7970547 DOI: 10.1021/acsomega.0c06316] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 02/24/2021] [Indexed: 05/20/2023]
Abstract
Glycoconjugated chlorins represent a promising class of compounds that meet the requirements for the third-generation photosensitizer (PS) for photodynamic therapy (PDT). We have focused on the use of glucose (Glc) to improve the performance of the PS based on the Warburg effect-a phenomenon where tumors consume higher Glc levels than normal cells. However, as a matter of fact, Glc-conjugation has a poor efficacy in hydrophilic modification; thus, the resultant PS is not suitable for intravenous injection. In this study, a Glc-based oligosaccharide, such as maltotriose (Mal3), is conjugated to chlorin e6 (Ce6). The conjugation is assisted by two additional molecular tools, such as propargyl amine and a tetraethylene glycol (TEG) derivative. This route produced the target Mal3-Ce6 conjugate linked via the TEG spacer (Mal3-TEG-Ce6), which shows the required photoabsorption properties in the physiological media. The PDT test using canine mammary carcinoma (SNP) cells suggested that the antitumor activity of Mal3-TEG-Ce6 is extremely high. Furthermore, in vitro tests against mouse mammary carcinoma (EMT6) cells have been demonstrated, providing insights into the photocytotoxicity, subcellular localization, and analysis of cell death and reactive oxygen species (ROS) generation for the PDT system with Mal3-TEG-Ce6. Both apoptosis and necrosis of the EMT6 cells occur by ROS that is generated via the photochemical reaction between Mal3-TEG-Ce6 and molecular oxygen. Consequently, Mal3-TEG-Ce6 is shown to be a PS showing the currently desired properties.
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Ono T, Yamamoto N, Nomoto A, Nakajima M, Yamada S, Tsuji H. P05.07 Single-Fraction Carbon ion Radiotherapy for Patients with Early-Stage Lung Cancer with or without Interstitial Pneumonitis. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.01.398] [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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Hayashi K, Yamamoto N, Nakajima M, Nomoto A, Ishikawa H, Ogawa K, Tsuji H. Carbon-ion radiotherapy for octogenarians with locally advanced non-small-cell lung cancer. Jpn J Radiol 2021; 39:703-709. [PMID: 33608792 PMCID: PMC8255258 DOI: 10.1007/s11604-021-01101-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 02/03/2021] [Indexed: 01/14/2023]
Abstract
PURPOSE The clinical significance of carbon-ion radiotherapy (CIRT) for octogenarians with locally advanced non-small-cell lung cancer (LA-NSCLC) remains unclear. We aimed to evaluate the clinical outcomes of CIRT alone for octogenarians with LA-NSCLC. MATERIALS AND METHODS We evaluated 32 patients who underwent CIRT alone between 1997 and 2015. The median age was 82.0 years (range, 80-88 years). In terms of clinical stage (UICC 7th edition), 7 (21.9%), 10 (31.3%), 11 (34.4%), and 4 (12.5%) patients had stage IIA, IIB, IIIA, and ΙΙΙB disease, respectively. The median CIRT dose was 72.0 Gy (relative biological effectiveness), and the median follow-up period was 33.1 months. RESULTS All patients successfully completed CIRT. Regarding grade ≥ 2 toxicities, 1 (3.1%), 3 (9.4%), and 4 (0.7%) patients developed grade 3 radiation pneumonitis, grade 2 radiation pneumonitis, and grade 2 dermatitis, respectively. No grade ≥ 4 toxicities were observed. The 2 year LC, PFS, and OS rates were 83.5%, 46.7%, and 68.0%, respectively. CONCLUSION CIRT alone is safe and effective for octogenarians with LA-NSCLC.
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Kataoka H, Nishie H, Tanaka M, Sasaki M, Nomoto A, Osaki T, Okamoto Y, Yano S. Potential of Photodynamic Therapy Based on Sugar-Conjugated Photosensitizers. J Clin Med 2021; 10:jcm10040841. [PMID: 33670714 PMCID: PMC7922816 DOI: 10.3390/jcm10040841] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/08/2021] [Accepted: 02/12/2021] [Indexed: 02/06/2023] Open
Abstract
In 2015, the Japanese health insurance approved the use of a second-generation photodynamic therapy (PDT) using talaporfin sodium (TS); however, its cancer cell selectivity and antitumor effects of TS PDT are not comprehensive. The Warburg effect describes the elevated rate of glycolysis in cancer cells, despite the presence of sufficient oxygen. Because cancer cells absorb considerable amounts of glucose, they are visible using positron emission tomography (PET). We developed a third-generation PDT based on the Warburg effect by synthesizing novel photosensitizers (PSs) in the form of sugar-conjugated chlorins. Glucose-conjugated (tetrafluorophenyl) chlorin (G-chlorin) PDT revealed significantly stronger antitumor effects than TS PDT and induced immunogenic cell death (ICD). ICD induced by PDT enhances cancer immunity, and a combination therapy of PDT and immune checkpoint blockers is expected to synergize antitumor effects. Mannose-conjugated (tetrafluorophenyl) chlorin (M-chlorin) PDT, which targets cancer cells and tumor-associated macrophages (TAMs), also shows strong antitumor effects. Finally, we synthesized a glucose-conjugated chlorin e6 (SC-N003HP) that showed 10,000-50,000 times stronger antitumor effects than TS (IC50) in vitro, and it was rapidly metabolized and excreted. In this review, we discuss the potential and the future of next-generation cancer cell-selective PDT and describe three types of sugar-conjugated PSs expected to be clinically developed in the future.
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Yamamoto Y, Ota M, Kodama S, Michimoto K, Nomoto A, Ogawa A, Furuya M, Kawakami K. Au/Ag/Cu-Mixed Catalysts for the Eco-Friendly Oxidation of 5-Hydroxymethylfurfural and Related Compounds to Carboxylic Acids under Atmospheric Oxygen in Water. ACS OMEGA 2021; 6:2239-2247. [PMID: 33521463 PMCID: PMC7841932 DOI: 10.1021/acsomega.0c05526] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 11/23/2020] [Indexed: 06/12/2023]
Abstract
A green method for the oxidation of alcohols to carboxylic acids was developed using a novel co-catalytic system based on gold, silver, and copper catalysts. This reaction system was conducted under atmospheric oxygen in water and mild conditions to selectively oxidize 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid, as a building block for polyethylene furanoate, which is a 100% bio-based, future alternative to the petroleum-based polyethylene terephthalate. Furthermore, various primary alcohols were conveniently oxidized to their corresponding carboxylic acids in up to quantitative yields.
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Soyama T, Sakuragi A, Oishi D, Kimura Y, Aoki H, Nomoto A, Yano S, Nishie H, Kataoka H, Aoyama M. Photodynamic therapy exploiting the anti-tumor activity of mannose-conjugated chlorin e6 reduced M2-like tumor-associated macrophages. Transl Oncol 2021; 14:101005. [PMID: 33401079 PMCID: PMC7785959 DOI: 10.1016/j.tranon.2020.101005] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 12/26/2020] [Indexed: 02/06/2023] Open
Abstract
M2-like tumor-associated macrophages (M2-TAMs) in cancer tissues are intimately involved in cancer immunosuppression in addition to growth, invasion, angiogenesis, and metastasis. Hence, considerable attention has been focused on cancer immunotherapies targeting M2-TAMs. However, systemic therapies inhibit TAMs as well as other macrophages important for normal immune responses throughout the body. To stimulate tumor immunity with fewer side effects, we targeted M2-TAMs using photodynamic therapy (PDT), which damages cells via a nontoxic photosensitizer with harmless laser irradiation. We synthesized a light-sensitive compound, mannose-conjugated chlorin e6 (M-chlorin e6), which targets mannose receptors highly expressed on M2-TAMs. M-chlorin e6 accumulated more in tumor tissue than normal skin tissue of syngeneic model mice and was more rapidly excreted than the second-generation photosensitizer talaporfin sodium. Furthermore, M-chlorin e6 PDT significantly reduced the volume and weight of tumor tissue. Flow cytometric analysis revealed that M-chlorin e6 PDT decreased the proportion of M2-TAMs and increased that of anti-tumor macrophages, M1-like TAMs. M-chlorin e6 PDT also directly damaged and killed cancer cells in vitro. Our data indicate that M-chlorin e6 is a promising new therapeutic agent for cancer PDT.
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Nomoto A, Yamaguchi H, Masuda M, Hyakumura K, Kodama S, Osaki T, Okamoto Y, Tanaka M, Kataoka H, Narumi A, Yoshimura T, Yano S, Ogawa A. Large-Scale Synthesis of Thio-glucose-Conjugated Chlorin e6 for Photodynamic Therapy. HETEROCYCLES 2021. [DOI: 10.3987/com-20-s(k)73] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Shimizu A, Maeda K, Wakabayashi H, Nishioka S, Ohno T, Nomoto A, Kayashita J, Fujishima I. Sarcopenic Dysphagia with Low Tongue Pressure Is Associated with Worsening of Swallowing, Nutritional Status, and Activities of Daily Living. J Nutr Health Aging 2021; 25:883-888. [PMID: 34409966 DOI: 10.1007/s12603-021-1641-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVES According to the recently proposed diagnostic criteria for sarcopenic dysphagia, sarcopenic dysphagia can be classified as probable or possible based on tongue pressure. However, it is unclear whether patients with probable and possible sarcopenic dysphagia have different characteristics. Therefore, this study aimed to investigate whether patients with possible and probable sarcopenic dysphagia have different clinical characteristics. DESIGN A cross-sectional study. SETTING A rehabilitation hospital. PARTICIPANTS In total, 129 patients aged ≥65 years with sarcopenic dysphagia were included. METHODS A tongue pressure of <20 kPa was indicative of probable sarcopenic dysphagia, and a tongue pressure of ≥20 kPa was indicative of possible sarcopenic dysphagia. Kuchi-Kara Taberu (KT) index scores were compared between the probable or possible sarcopenic dysphagia groups. RESULTS According to the tongue pressure, 76 and 53 patients were classified into the probable and possible sarcopenic dysphagia groups, respectively. In multiple linear regression analysis, the presence of probable sarcopenic dysphagia was independently associated with the total KT index score (standardized coefficient: -0.313, regression coefficient: -4.500, 95% confidence interval [CI], -6.920 to -2.080, P < 0.001). The presence of probable sarcopenic dysphagia was independently associated with some subitems of the KT index (willingness to eat, cognitive function while eating, oral preparatory and propulsive phase, severity of pharyngeal dysphagia, eating behavior, and daily living activities). CONCLUSIONS Patients with probable sarcopenic dysphagia were characterized by poor overall eating-related conditions, especially poor swallowing ability, ability to perform activities of daily living, and nutritional status.
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Ono T, Yamamoto N, Nomoto A, Nakajima M, Isozaki Y, Kasuya G, Ishikawa H, Nemoto K, Tsuji H. Long Term Results of Single-Fraction Carbon-Ion Radiotherapy for Non-small Cell Lung Cancer. Cancers (Basel) 2020; 13:cancers13010112. [PMID: 33396455 PMCID: PMC7795673 DOI: 10.3390/cancers13010112] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 12/24/2020] [Accepted: 12/28/2020] [Indexed: 12/25/2022] Open
Abstract
Simple Summary There were no reports on long-term results of single-fraction passive carbon-ion radiotherapy in patients with early-stage non-small cell lung cancer. We showed that this treatment was not inferior compared to stereotactic body radiotherapy or proton beam therapy with no ≥grade 2 pneumonitis. This study suggests that single-fraction passive carbon-ion radiotherapy can serve as an alternate treatment for patients with early-stage non-small cell lung cancer, especially in medically inoperable patients. Abstract Background: The purpose of the present study was to evaluate the efficacy and safety of single-fraction carbon-ion radiotherapy (CIRT) in patients with non-small cell lung cancer. Methods: Patients with histologically confirmed non-small cell lung cancer, stage T1-2N0M0, and treated with single-fraction CIRT (50Gy (relative biological effectiveness)) between June 2011 and April 2016 were identified in our database and retrospectively analyzed. Toxicity was evaluated using the Common Terminology Criteria for Adverse Events version 4.0. Results: The study included 57 patients, 22 (38.6%) of whom had inoperable cancer. The median age was 75 years (range: 42–94 years), and the median follow-up time was 61 months (range: 6–97 months). The 3- and 5-year overall survival rates were 91.2% and 81.7%, respectively. All survivors were followed up for more than three years. The 3- and 5-year local control rates were 96.4% and 91.8%, respectively. No case of ≥ grade 2 pneumonitis was recorded. Conclusions: This study suggests that single-fraction CIRT for T1-2N0M0 non-small cell lung cancer patients is feasible and can be considered as one of the treatment choices, especially in medically inoperable patients.
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Teramoto M, Imoto M, Takeda M, Mizuno T, Nomoto A, Ogawa A. Transition-Metal-Free Synthesis of 2-Substituted Benzothiazoles from Nitrobenzenes, Methylheteroaryl Compounds, and Elemental Sulfur, Based on Nitro-Methyl Redox-Neutral Cyclization. J Org Chem 2020; 85:15213-15220. [PMID: 33147021 DOI: 10.1021/acs.joc.0c02072] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Greener and more sustainable chemical processes are required to address increasing environmental pollution and depletion of natural resources. This paper aims to develop greener and more sustainable modern synthetic chemical processes using redox-neutral cyclization. Redox-neutral cyclization has been shown to promote the efficient synthesis of 2-substituted benzothiazoles from easily available nitrobenzenes, methyl-heteroaryl compounds, and elemental sulfur in the absence of transition-metal catalysts. The 2-substituted benzothiazoles were obtained in reasonable yields through the sulfuration of electron-deficient C-H bonds with elemental sulfur. This synthetic methodology also affords a high atom economy without the use of any external oxidizing and/or reducing reagents.
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Yamamoto Y, Tanaka R, Ota M, Nishimura M, Tran CC, Kawaguchi SI, Kodama S, Nomoto A, Ogawa A. Photoinduced Syntheses and Reactivities of Phosphorus-Containing Interelement Compounds. J Org Chem 2020; 85:14708-14719. [PMID: 33112141 DOI: 10.1021/acs.joc.0c02014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The photoinduced reactions of tetraphenyldiphosphine disulfide with a range of organic dichalcogenides successfully afforded a series of phosphorus(V)-chalcogen interelement compounds via a radical process. The relative reactivities of the organic dichalcogenides (i.e., (PhS)2, (PhSe)2, and (PhTe)2) toward the PIII or PV groups in the diphosphine analogues under light were investigated in detail, and a convenient method was developed to form P-S or P-Se interelement compounds from tetraphenyldiphosphine disulfide and (PhS)2 or (PhSe)2 upon photoirradiation. Furthermore, the relative photochemical properties and reactivities of tetraphenyldiphophine (P-P interelement compound) and its analogues toward photoinduced radical addition reactions were also discussed. The formed P-E (E = S, Se) interelement compounds could be utilized for ionic reactions, and they could be transformed into various phosphine reagents via one-pot processes.
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Yamamoto Y, Kawaguchi SI, Nishimura M, Sato Y, Shimada Y, Tabuchi A, Nomoto A, Ogawa A. Phosphorus-Recycling Wittig Reaction: Design and Facile Synthesis of a Fluorous Phosphine and Its Reusable Process in the Wittig Reaction. J Org Chem 2020; 85:14684-14696. [PMID: 33166463 DOI: 10.1021/acs.joc.0c01926] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This study shows that phosphorus sources can be recycled using the appropriate fluorous phosphine in the Wittig reaction. The designed fluorous phosphine, which has an ethylene spacer between its phosphorus atom and the perfluoroalkyl group, was synthesized from air-stable phosphine reagents. The synthesized phosphine can be used for the Wittig reaction process to obtain various alkenes in adequate yields and stereoselectivity. The concomitantly formed fluorous phosphine oxide was extracted from the reaction mixture using a fluorous biphasic system. The fluorous phosphine was regenerated by reducing the fluorous phosphine oxide with diisobutylaluminum hydride. Finally, a series of gram scale phosphorus recycling processes were performed, which included the Wittig reaction, separation, reduction, and reuse.
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Yamamoto Y, Kawaguchi SI, Kodama S, Nomoto A, Ogawa A. Highly Selective Hydroiodination of Carbon-Carbon Double or Triple Bonds. CURR ORG CHEM 2020. [DOI: 10.2174/1385272824666191227111257] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Iodine is an element that exhibits characteristic features of heavy halogen, and
several compounds containing iodine constitute important synthetic intermediates due to
synthetically easy manipulation. To utilize iodine units for organic synthesis, a highly regio-
and stereoselective introduction of iodine to versatile building blocks is significant,
and a lot of research works for the selective introduction of iodine to alkynes or alkenes
have been conducted. In this review article, we describe regio- and stereoselective hydroiodination
to multiple bonds of building blocks, and its synthetic applications as key
intermediates to construct several important compounds in organic chemistry.
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Tran CC, Kawaguchi SI, Sato F, Nomoto A, Ogawa A. Photoinduced Cyclizations of o-Diisocyanoarenes with Organic Diselenides and Thiols that Afford Chalcogenated Quinoxalines. J Org Chem 2020; 85:7258-7266. [DOI: 10.1021/acs.joc.0c00647] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Kodama S, Kondo S, Nomoto A, Ogawa A. Tris(4,4′-di- tert-butyl-2,2′-bipyridine)( trans-4- tert-butylcyclohexanolato)deca-μ-oxido-heptaoxidoheptavanadium acetonitrile monosolvate including another unknown solvent molecule. IUCRDATA 2020; 5:x200449. [PMID: 36338301 PMCID: PMC9462217 DOI: 10.1107/s2414314620004496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 04/01/2020] [Indexed: 11/17/2022] Open
Abstract
The title heptanuclear alkoxido(oxido)vanadium(V) oxide cluster complex, [V7(C10H19O)O17(C18H24N2)3]·CH3CN, has a V7O18N6 core with approximately Cs symmetry, which is composed of two VO4 tetrahedra, two VO6 octahedra and three VO4N2 octahedra. The title heptanuclear alkoxido(oxido)vanadium(V) oxide cluster complex, [V7(C10H19O)O17(C18H24N2)3]·CH3CN, was obtained by the reaction of [V8O20(C18H24N2)4] with 4-tert-butylcyclohexanol (mixture of cis and trans) in a mixed CHCl3/CH3CN solvent. The complex has a V7O18N6 core with approximately Cs symmetry, which is composed of two VO4 tetrahedra, two VO6 octahedra and three VO4N2 octahedra. In the crystal, these complexes are linked together by weak intermolecular C—H⋯O hydrogen bonds between the 4,4′-di-tert-butyl-2,2′-bipyridine ligand and the V7O18N6 core, forming a one-dimensional network along the c-axis direction. Besides the complex, the asymmetric unit contains one CH3CN solvent molecule. The contribution of other disordered solvent molecules to the scattering was removed using the SQUEEZE option in PLATON [Spek (2015 ▸). Acta Cryst. C71, 9–18]. The unknown solvent molecules are not considered in the chemical formula and other crystal data.![]()
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Anzai M, Yamamoto N, Hayashi K, Nakajima M, Nomoto A, Ogawa K, Tsuji H. Safety and Efficacy of Carbon-ion Radiotherapy Alone for Stage III Non-small Cell Lung Cancer. Anticancer Res 2020; 40:379-386. [PMID: 31892590 DOI: 10.21873/anticanres.13963] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 11/26/2019] [Accepted: 11/29/2019] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM We evaluated the efficacy and safety of carbon-ion radiotherapy (CIRT) alone for Stage III non-small-cell lung cancer (NSCLC). PATIENTS AND METHODS Data of 65 patients (median age=73 years) with Stage III NSCLC who underwent CIRT alone in the QST Hospital, Chiba, Japan, between 1997 and 2015 were retrospectively analysed. The median dose was 72.0 Gy (relative biological effectiveness). RESULTS The median follow-up was 27.6 months (range=1.6-207.7 months). Two-year local control, progression-free survival (PFS), and overall survival (OS) rates were 73.9%, 38.6%, and 54.9%, respectively. Overall, 1 (2%), 4 (6%), and 1 (2%) patient developed Grade 4 (mediastinal haemorrhage), Grade 3 (radiation pneumonitis), and Grade 3 (bronchial fistula) toxicities, respectively. On univariate analysis, clinical T and N stage and CIRT timing were significant predictors of PFS and OS; clinical target volume was a significant predictor of PFS. CONCLUSION CIRT alone is effective with acceptable toxicity for Stage III NSCLC.
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Narumi A, Nakazawa T, Shinohara K, Kato H, Iwaki Y, Okimoto H, Kikuchi M, Kawaguchi S, Hino S, Ikeda A, Shaykoon MSA, Shen X, Duan Q, Kakuchi T, Yasuhara K, Nomoto A, Mikata Y, Yano S. C 60 Fullerene with Tetraethylene Glycols as a Well-defined Soluble Building Block and Saccharide-conjugation Producing PDT Photosensitizer. CHEM LETT 2019. [DOI: 10.1246/cl.190492] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Tran CC, Kawaguchi SI, Kobiki Y, Matsubara H, Tran DP, Kodama S, Nomoto A, Ogawa A. Palladium-Catalyzed Diarylation of Isocyanides with Tetraarylleads for the Selective Synthesis of Imines and α-Diimines. J Org Chem 2019; 84:11741-11751. [PMID: 31432680 DOI: 10.1021/acs.joc.9b01639] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Using tetraaryllead compounds (PbAr4) as arylating reagents, isocyanides undergo selective diarylation in the presence of palladium catalysts such as Pd(OAc)2 or Pd(PPh3)4 to afford imines and/or α-diimines based on the isocyanide employed. With aliphatic isocyanides, imines are obtained preferentially, whereas α-diimines are formed in the case of electron-rich aromatic isocyanides. The differences in imine/α-diimine selectivity can be attributed to the stability of imidoylpalladium intermediates formed in this catalytic reaction. Compared with other arylating reagents, tetraaryllead compounds are excellent candidates for use in the selective transformations to imines and/or α-diimines, especially in terms of inhibiting the oligomerization of isocyanides, which results in a lower product selectivity in many transition-metal-catalyzed reactions of isocyanides.
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Dong CP, Uematsu A, Kumazawa S, Yamamoto Y, Kodama S, Nomoto A, Ueshima M, Ogawa A. 2,4,6-Trihydroxybenzoic Acid-Catalyzed Oxidative Ugi Reactions with Molecular Oxygen via Homo- and Cross-Coupling of Amines. J Org Chem 2019; 84:11562-11571. [DOI: 10.1021/acs.joc.9b01422] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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