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Article ; Online: Photoinduced Synthesis of Bisphosphinated Quinoxalines via Radical Cyclization of o-Diisocyanoarenes with Diphosphines.

Yamamoto, Yuki / Ogawa, Akiya

2023 Volume 18, Issue 8, Page(s) e202201269

Abstract: The cycloaddition reaction of o-diisocyanoarenes with interelement compounds under light is a very important reaction system to clarify whether this reaction proceeds by radical cyclization or by aza-Bergman cyclization. In this study, a series of ... ...

Abstract	The cycloaddition reaction of o-diisocyanoarenes with interelement compounds under light is a very important reaction system to clarify whether this reaction proceeds by radical cyclization or by aza-Bergman cyclization. In this study, a series of diphosphines with phosphorus-phosphorus single bonds were selected as interelement compounds, and their cycloaddition reactions with o-diisocyanoarenes under light were investigated in detail to achieve a novel photoinduced synthesis of bisphosphinated quinoxalines via the radical cyclization pathway. In addition, the photoinduced reaction of diphosphines with isocyanides having o-functional groups such as cyano and ethenyl groups allowed us to elucidate the reaction pathway and product selectivity of this bisphosphination. Furthermore, the one-pot synthesis of Pd
Language	English
Publishing date	2023-02-03
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2233006-9
ISSN	1861-471X ; 1861-4728
ISSN (online)	1861-471X
ISSN	1861-4728
DOI	10.1002/asia.202201269
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Article ; Online: Metal-Free One-Pot Multi-Functionalization of Unsaturated Compounds with Interelement Compounds by Radical Process.

Yamamoto, Yuki / Ogawa, Akiya

Molecules (Basel, Switzerland)

2023 Volume 28, Issue 2

Abstract: In recent years, the importance of "environmentally friendly manufacturing" has been increasing toward the establishment of a resource-recycling society. In organic synthesis, as well, it is becoming increasingly important to develop new synthetic ... ...

Abstract	In recent years, the importance of "environmentally friendly manufacturing" has been increasing toward the establishment of a resource-recycling society. In organic synthesis, as well, it is becoming increasingly important to develop new synthetic strategies with resource conservation and the recycling of elemental resources in mind, rather than just only synthesis. Many studies on the construction of frameworks of functional molecules using ionic reactions and transition-metal-catalyzed reactions have been reported, but most of them have focused on the formation of carbon-carbon bonds. However, it is essential to introduce appropriate functional groups at appropriate positions in molecules in order for the molecules to express their functions, and furthermore, the highly selective preparation of multiple functional groups is considered important for the creation of new functional molecules. In this review, we focus on radical reactions with high functional group selectivity and overview the recent progress in practical methods for the simultaneous introduction of multiple functional groups and propose future synthetic strategies that emphasize the recycling of elemental resources and environmental friendliness.
MeSH term(s)	Transition Elements/chemistry ; Metals ; Carbon/chemistry ; Chemistry Techniques, Synthetic
Chemical Substances	Transition Elements ; Metals ; Carbon (7440-44-0)
Language	English
Publishing date	2023-01-12
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	1413402-0
ISSN	1420-3049 ; 1431-5165 ; 1420-3049
ISSN (online)	1420-3049
ISSN	1431-5165 ; 1420-3049
DOI	10.3390/molecules28020787
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Article ; Online: Transition-Metal-Catalyzed Addition of Organosulfur Compounds to Alkynes and Alkenes: Catalysis and Catalyst Poisons.

Yamamoto, Yuki / Ogawa, Akiya

Chemistry (Weinheim an der Bergstrasse, Germany)

2023 Volume 29, Issue 64, Page(s) e202302432

Abstract: The addition of heteroatom compounds to alkynes and alkenes is an atom-efficient method of carbon-heteroatom bond formation and is widely used as a fundamental synthetic method for the construction of functional molecules. Nevertheless, examples of ... ...

Abstract	The addition of heteroatom compounds to alkynes and alkenes is an atom-efficient method of carbon-heteroatom bond formation and is widely used as a fundamental synthetic method for the construction of functional molecules. Nevertheless, examples of transition-metal-catalyzed addition reactions of group 16 heteroatom compounds to carbon-carbon unsaturated bonds have been limited due to the widespread belief that organic sulfur and selenium compounds are representative catalyst poisons. In recent decades, however, several seminal catalytic reactions of sulfur compounds have been developed, providing important insights into catalysis and poisons. Therefore, this paper focuses on the transition-metal-catalyzed addition of organosulfur compounds to alkynes and alkenes, gains comprehensive insights into the catalysis and catalyst poisons, and proposes concepts for the development of transition-metal-catalyzed reactions of group 16 heteroatom compounds.
Language	English
Publishing date	2023-10-17
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1478547-X
ISSN	1521-3765 ; 0947-6539
ISSN (online)	1521-3765
ISSN	0947-6539
DOI	10.1002/chem.202302432
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Article ; Online: Multicomponent Reactions between Heteroatom Compounds and Unsaturated Compounds in Radical Reactions.

Ogawa, Akiya / Yamamoto, Yuki

Molecules (Basel, Switzerland)

2023 Volume 28, Issue 17

Abstract: In this mini-review, we present our concepts for designing multicomponent reactions with reference to a series of sequential radical reactions that we have developed. Radical reactions are well suited for the design of multicomponent reactions due to ... ...

Abstract	In this mini-review, we present our concepts for designing multicomponent reactions with reference to a series of sequential radical reactions that we have developed. Radical reactions are well suited for the design of multicomponent reactions due to their high functional group tolerance and low solvent sensitivity. We have focused on the photolysis of interelement compounds with a heteroatom-heteroatom single bond, which readily generates heteroatom-centered radicals, and have studied the photoinduced radical addition of interelement compounds to unsaturated compounds. First, the background of multicomponent radical reactions is described, and basic concepts and methodology for the construction of multicomponent reactions are explained. Next, examples of multicomponent reactions involving two interelement compounds and one unsaturated compound are presented, as well as examples of multicomponent reactions involving one interelement compound and two unsaturated compounds. Furthermore, multicomponent reactions involving intramolecular cyclization processes are described.
Language	English
Publishing date	2023-08-30
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	1413402-0
ISSN	1420-3049 ; 1431-5165 ; 1420-3049
ISSN (online)	1420-3049
ISSN	1431-5165 ; 1420-3049
DOI	10.3390/molecules28176356
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Article: Moyamoya Syndrome: Differential Diagnosis in Patients With Central Nervous System Symptoms and Hyperthyroidism.

Maezawa, Yosuke / Nagasaki, Kazuya / Aiyama, Hitoshi / Yamamoto, Yuki / Shibata, Yasushi

Cureus

2024 Volume 16, Issue 2, Page(s) e53519

Abstract: Moyamoya syndrome, known as secondary moyamoya disease, is associated with various primary illnesses, such as brain tumor, meningitis, autoimmune disease, and thyrotoxicosis, and their relations are not clear. We report a rare case of moyamoya syndrome ... ...

Abstract	Moyamoya syndrome, known as secondary moyamoya disease, is associated with various primary illnesses, such as brain tumor, meningitis, autoimmune disease, and thyrotoxicosis, and their relations are not clear. We report a rare case of moyamoya syndrome in a patient with Graves' disease. An 18-year-old woman was admitted to our hospital due to convulsions. She had symptoms of palpitations and fatiguability for half a year and transient numbness in her left upper extremity and dysarthria for a month. In physical findings, tachycardia and diffuse thyroid swelling were noted. A blood test revealed thyrotoxicosis and antithyroid antibody, and a diagnosis of Graves' disease was obtained. Brain magnetic resonance imaging (MRI) showed bilateral internal carotid artery occlusion. We finally diagnosed the patient with moyamoya syndrome caused by Graves' disease. Moyamoya disease or syndrome can cause symptoms like a stroke, sometimes requiring neurosurgical treatment. In our case, the therapy for Graves' disease resolved the symptoms. When diagnosing moyamoya disease, it is necessary to confirm whether there are any background diseases, such as Graves' disease.
Language	English
Publishing date	2024-02-03
Publishing country	United States
Document type	Case Reports
ZDB-ID	2747273-5
ISSN	2168-8184
ISSN	2168-8184
DOI	10.7759/cureus.53519
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Article: The effect of forest certification on conservation and sustainable forest management

Yamamoto, Yuki / Matsumoto, Ken’ichi

Journal of cleaner production. 2022 May 21,

2022

Abstract: This study examined the effect of sustainable forest management schemes on forest conservation using remote sensing data on forest change. We applied fixed effect models focusing on two major sustainable forest management schemes: the Forest Stewardship ... ...

Abstract	This study examined the effect of sustainable forest management schemes on forest conservation using remote sensing data on forest change. We applied fixed effect models focusing on two major sustainable forest management schemes: the Forest Stewardship Council and the Programme for the Endorsement of Forest Certification. Contrary to the findings from previous research, the regression results showed that expansion of the sustainable forest management area was uncorrelated with forest loss when controlling for the fixed effects of country and time. These findings were robust to the different definitions of a forest and country groups’ OECD membership. Our estimations suggested that sustainable forest management increased forest loss in non-certified forest areas, indicating the leakage of forest loss from certified to non-certified forest areas. This implies that leakage effects should be considered when implementing forest management or protected forest schemes.
Keywords	forest certification ; forest conservation ; forest reserves ; forests ; sustainable forestry
Language	English
Dates of publication	2022-0521
Publishing place	Elsevier Ltd
Document type	Article
Note	Pre-press version
ISSN	0959-6526
DOI	10.1016/j.jclepro.2022.132374
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Diphenyl Diselenide-Assisted Radical Addition Reaction of Diphenyl Disulfide to Unsaturated Bonds upon Photoirradiation.

Yamamoto, Yuki / Chen, Qiqi / Ogawa, Akiya

Molecules (Basel, Switzerland)

2023 Volume 28, Issue 6

Abstract: The addition reaction of interelement compounds with heteroatom-heteroatom single bonds to unsaturated bonds under photoirradiation is an important method for the efficient and atom-economical construction of carbon-heteroatom bonds. However, in practice, ...

Abstract	The addition reaction of interelement compounds with heteroatom-heteroatom single bonds to unsaturated bonds under photoirradiation is an important method for the efficient and atom-economical construction of carbon-heteroatom bonds. However, in practice, the desired addition reaction is sometimes unable to proceed as expected due to the low efficiency of the desired addition reactions or the preferential polymerization of unsaturated compounds. In this study, by combining an interelement compound with homologous heteroatom compounds as a catalyst, we succeeded in suppressing the polymerization of the unsaturated compounds and in attaining a highly selective carbon-heteroatom bond formation through the desired addition reaction. In this paper, we have examined in detail whether such a "catalytic radical reaction" proceeds for unsaturated compounds and found that the dithiolation of some unsaturated compounds (i.e., vinylic ethers, styrenes, and isocyanides) could proceed with the assistance of (PhSe)
Language	English
Publishing date	2023-03-07
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1413402-0
ISSN	1420-3049 ; 1431-5165 ; 1420-3049
ISSN (online)	1420-3049
ISSN	1431-5165 ; 1420-3049
DOI	10.3390/molecules28062450
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Article ; Online: Liquid Structures and Diffusion Dynamics of Alkyl-Pyrene Liquids Studied by Molecular Dynamics Simulations.

Yamamoto, Yuki / Lu, Fengniu / Nakanishi, Takashi / Hayashi, Shigehiko

The journal of physical chemistry. B

2023 Volume 127, Issue 21, Page(s) 4870–4885

Abstract: Functional molecular liquids (FMLs) based on alkylated π-conjugated molecules have attracted attention as solvent-free and nonvolatile liquid materials with prominent optoelectronic features. Recently, novel FML compounds containing pyrene as the ... ...

Abstract	Functional molecular liquids (FMLs) based on alkylated π-conjugated molecules have attracted attention as solvent-free and nonvolatile liquid materials with prominent optoelectronic features. Recently, novel FML compounds containing pyrene as the functional core were synthesized, and their rheological and photochemical properties were investigated. Although the molecules differ only in the number of alkyl chain substituents and their substitution positions, their viscosity coefficients are largely different beyond the Stokes-Einstein relation on the assumption of identical microscopic friction, indicating that local microscopic molecular interactions are crucial for the macroscopic rheological properties. Here, we report a theoretical study on the rheological properties of the alkyl-pyrene liquids by means of atomistic molecular dynamics (MD) simulations. We performed long-time MD simulations for tens of microseconds to obtain ample statistical samples of the alkyl-pyrene liquids and analyzed their liquid structures and diffusion dynamics based on spatiotemporal correlation functions. We found the formation of characteristic local liquid structures of π-π stacking of the pyrene moieties and locally anisotropic and anomalous diffusion dynamics, which remarkably vary depending on the alkyl substituent patterns. The present results provide an atomistic insight into the macroscopic rheological properties of alkyl-π FMLs and molecular design strategy for them.
Language	English
Publishing date	2023-04-24
Publishing country	United States
Document type	Journal Article
ISSN	1520-5207
ISSN (online)	1520-5207
DOI	10.1021/acs.jpcb.2c08385
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Article ; Online: Patients with central serous chorioretinopathy have high circulating alpha-klotho concentrations.

Tahara, Eri / Yamamoto, Yuki / Sugisawa, Takaaki / Gomi, Fumi

PloS one

2023 Volume 18, Issue 12, Page(s) e0295795

Abstract: Stress is a risk factor for central serous chorioretinopathy (CSC), but a suitable biomarker of this stress has not been identified. We aimed to evaluate alpha-klotho (αKl) as a potential biomarker of CSC. The circulating concentrations of αKl in ... ...

Abstract	Stress is a risk factor for central serous chorioretinopathy (CSC), but a suitable biomarker of this stress has not been identified. We aimed to evaluate alpha-klotho (αKl) as a potential biomarker of CSC. The circulating concentrations of αKl in patients diagnosed with acute or chronic CSC and treated at Hyogo College of Medicine between December 2019 and July 2021 were retrospectively compared with those of healthy individuals. We also compared the αKl concentrations of patients with acute or chronic CSC. Furthermore, we evaluated the relationships of age, sex, smoking status, and subfoveal choroidal thickness (SFCT) with αKl concentration. Patients in whom subretinal fluid reaccumulated in the same eye after its resolution were defined as having recurrent CSC. We studied 56 patients (46 men and 10 women) and 27 healthy controls (19 men and 8 women); and 38 and 18 eyes with acute and chronic CSC, respectively. The mean circulating concentration of αKl was higher in patients with CSC than in controls (827±232 and 724±183 pg/mL, respectively; p = 0.035). The mean SFCT was greater in patients with CSC than in controls (416±91.0 and 278±96.3 μm, respectively; p<0.0001). The mean αKl concentration was significantly higher in the patients with acute CSC than in those with chronic CSC (898±221 and 740±224 pg/mL, respectively; p = 0.038). Recurrence of CSC occurred in 10 of 56 (17.9%) eyes, of which five eyes were in the acute CSC group and five were in the chronic CSC group. Patients who experienced recurrence had significantly higher αKI concentrations than those who did not (p = 0.0219). There were no significant relationships of αKl concentration with age, sex, smoking history, or SFCT. In summary, the circulating αKI concentrations of patients with CSC are high, which suggests that αKI may be an indicator of stress in such patients.
MeSH term(s)	Male ; Humans ; Female ; Central Serous Chorioretinopathy/diagnosis ; Retrospective Studies ; Choroid ; Tomography, Optical Coherence ; Biomarkers ; Fluorescein Angiography
Chemical Substances	Biomarkers
Language	English
Publishing date	2023-12-21
Publishing country	United States
Document type	Journal Article
ZDB-ID	2267670-3
ISSN	1932-6203 ; 1932-6203
ISSN (online)	1932-6203
ISSN	1932-6203
DOI	10.1371/journal.pone.0295795
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Article ; Online: The final 28 Days:Prenatal exposure to air pollution and child anthropometric outcomes.

Yang, Jie / Chen, Xintong / Yamamoto, Yuki

Journal of environmental management

2023 Volume 342, Page(s) 118289

Abstract: This study examines the health consequences of prenatal exposure to air pollution by combining child health data from an original survey with the Air Pollution Index (API) from official Chinese statistics. Our results show that exposure to air pollution ... ...

Abstract	This study examines the health consequences of prenatal exposure to air pollution by combining child health data from an original survey with the Air Pollution Index (API) from official Chinese statistics. Our results show that exposure to air pollution in late trimester (four-week windows before delivery) is negatively associated with health outcomes in children in the short and long terms. One standard deviation increase in the API in the final 28 days before delivery decreased birth weight and length by 0.388 and 0.458, respectively, in z-scores and lowered the weight-for-age and height-for-age by 0.370 and 0.441, respectively, in z-scores at 13-15 years post-exposure. Although the timing of exposure and its consequences have been the subject of debate in existing literature, our results focus on four-week windows and demonstrate that exposure during the late pregnancy period may have adverse health effects on children. We conducted analyses that accounted for potential covariates and omitted variables, and our results remain robust and statistically significant. We also found gender heterogeneous effects that girls are more vulnerable to fetal air pollution exposure than boys. Our findings uncover fetal and child health risks regarding air pollution and reinforce the importance of policies for mitigating air pollution in developing countries.
MeSH term(s)	Male ; Female ; Humans ; Child ; Pregnancy ; Adolescent ; Air Pollutants/analysis ; Prenatal Exposure Delayed Effects/chemically induced ; Air Pollution/analysis ; Particulate Matter/analysis
Chemical Substances	Air Pollutants ; Particulate Matter
Language	English
Publishing date	2023-06-04
Publishing country	England
Document type	Journal Article
ZDB-ID	184882-3
ISSN	1095-8630 ; 0301-4797
ISSN (online)	1095-8630
ISSN	0301-4797
DOI	10.1016/j.jenvman.2023.118289
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