检索结果-南通市图书馆

Synthesis of arylsulfonyl-substituted indolo[2,1-a]isoquinolin-6(5H)-one derivatives via a TBAI-catalyzed radical cascade cyclization

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第1期33卷 276-279页

作者： Shengxian zhai Shuxian Qiu Shuai Yang Bingyan Hua Yongsheng Niu Chuchu Han Youzhu Yu Yuchao Li hongbin zhai College of Chemistry&Environmental Engineering Anyang Institute of TechnologyAnyang 455000China Department of Chemistry Guangdong University of EducationGuangzhou 510303China State Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical Genomics Shenzhen Engineering Laboratory of Nano Drug Slow-ReleaseShenzhen Graduate School of Peking UniversityShenzhen 518055China

We have developed a metal-free radical cascade reaction of N-substituted 2-aryl indoles with readily available sulfonyl hydrazides for the rapid construction of arylsulfonyl-substituted indolo[2,1-a]isoquinolin-6(5H)-one *** the TBAI–TBHP catalytic system,a broad series of structurally diverse indolo[2,1-a]isoquinolin-6(5H)-one derivatives were obtained in moderate to excellent *** reaction features mild reaction conditions,operationally easiness,scaled-up feasibility,and high functional-group-tolerance.

关键词： TBAI-catalyzed Metal-free Radical cascade Cyclization Nitrogen-containing heterocycles Fused-indole derivatives

Facile access to β-hydroxyl ketones via a cobalt-catalyzed ring-opening/hydroxylation cascade of cyclopropanols

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第3期34卷 322-325页

作者： Shengxian zhai Shuxian Qiu Shuangtao Yang Xingyuan Gao Xinyu Feng Chenzhe Yun Ning Han Yongsheng Niu Jing Wang hongbin zhai College of Chemistry&Environmental Engineering Anyang Institute of TechnologyAnyang 455000China Department of Chemistry and Material Science Engineering Technology Development Center of Advanced Materials&Energy Saving and Emission Reduction in Guangdong Colleges and UniversitiesGuangdong University of EducationGuangzhou 510303China State Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical Genomics Shenzhen Engineering Laboratory of Nano Drug Slow-ReleaseShenzhen Graduate School of Peking UniversityShenzhen 518055China Shenzhen Bay Laboratory Shenzhen 518055China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300071China

A cobalt-catalyzed ring-opening/hydroxylation cascade of highly strained cyclopropanols has been developed for the first time. The reaction was conducted under open-air atmosphere to afford a broad series of structurally diverse β-hydroxy ketones in moderate to good yields with high *** protocol features mild reaction conditions, simple operation, high-functional-group tolerance, facile scalability, and heterocycle compatibility.

关键词： Cobalt catalysis Ring-opening Cyclopropanol β-Hydroxy ketone Cascade reaction

Environmental benefits and farmers' adoption of winter cover crops in the North China Plain

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2024年第1期34卷 159-169页

作者： Shufang GUO Yitao ZHANG Limei zhai Jian LIU Hongyuan WANG hongbin LIU State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China Key Laboratory of Nonpoint Source Pollution ControlMinistry of Agriculture and Rural AffairsInstitute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China Institute of Agricultural Environment and Resources Yunnan Academy of Agricultural SciencesKunming 650205China Shandong Yucheng Agro-ecosystem National Observation Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China The Norwegian Institute of Bioeconomy Research(NIBIO) Akershus 1431Norway

The introduction of cover crops into monoculture systems to improve soil health has been widely adopted worldwide. However, little is known about the environmental risks and application prospects of different cover crops in spring maize(Zea mays L.) monocultures proposed in the North China Plain. A pot experiment was conducted to evaluate the effects of different winter cover crops on subsequent maize yield, soil fertility, and environmental risks of nitrogen(N) loss, and a questionnaire survey was conducted to examine factors influencing farmers' willingness to adopt cover crops in the North China Plain. Based on the same fertilization regime during the maize growing period, four winter cover crop treatments were set up, including bare fallow, hairy vetch(Vicia villosa Roth.), February orchid(Orychophragmus violaceus), and winter oilseed rape(Brassica campestris L.). The results indicated that winter cover crops significantly increased subsequent maize yield and soil organic carbon, total N, and microbial biomass carbon and N compared with the bare fallow *** incorporation of cover crops led to a negligible increase in nitrous oxide(N_(2)O) emissions and had a very limited effect on ammonia(NH_(3)) *** incorporation of February orchid and winter oilseed rape decreased nitrate leaching compared with the hairy vetch treatment in the maize growing *** N losses via N_(2)O and NH_(3) emissions and N leaching accounted for 71%–84% of the N surplus. However, yield increase and environmental benefits were not the main positive factors for farmers to accept cover crops. Financial incentive was rated by 83.9% of farmers as an “extremely important” factor, followed by other costs, when considering winter cover cropping. These results indicate that the environmental benefits depend on the type of cover crop. Maintaining high levels of soil fertility and maize yield, providing sufficient subsidies, and encouraging large-area cultivation of cover crops

关键词： cover crop N leaching NH_(3)emission N_(2)O emission spring maize willingness to accept

Irrigation and nitrogen fertiliser optimisation in protected vegetable fields of northern China:Achieving environmental and agronomic sustainability

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第3期23卷 1022-1033页

作者： Bingqian Fan Yitao Zhang Owen Fenton Karen Daly Jungai Li Hongyuan Wang Limei zhai Xiaosheng Luo Qiuliang Lei Shuxia Wu hongbin Liu State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China/Key Laboratory of Nonpoint Source Pollution Control Ministry of Agriculture and Rural Affairs/lnstitute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Teagasc Environmental Research CentreWexford Y35Ireland Institute of Plant Nutrition Resources and Environmental SciencesHenan Academy of Agricultural SciencesZhengzhou 450002China

Globally,sub-optimal use of nitrogen (N) fertiliser and elevated N irrigation groundwater have led to high leached nitrate (NO_(3)^(–)) losses from protected vegetable field *** fertiliser and irrigation management in different soil types is crucial to reduce future N loads from such *** present 4-year study examined leached N loads from lysimeter monitoring arrays set up across 18 protected vegetable system sites encompassing the dominant soil types of northern *** treatments applied at each field site were:1) a high N and high irrigation input treatment (HNHI);2) a low N but high irrigation input treatment (LNHI) and 3) a low N with low irrigation input treatment (LNLI).Results showed that the mean annual leached total nitrogen loads from the HNHI,LNHI and LNLI treatments were 325,294 and 257 kg N ha^(–1) in the fluvo-aquic soil,114,100 and 78 kg N ha^(–1) in the cinnamon soil and 79,68 and 57 kg N ha^(–1) in the black soil,*** N dissolved in irrigation water in the fluvo-aquic soil areas was 8.26-fold higher than in the cinnamon areas.A structural equation model showed that N fertiliser inputs and leaching water amounts explained 14.7 and 81.8%of the variation of leached N loads,***,reducing irrigation water by 21.5%decreased leached N loads by 20.9%,while reducing manure N and chemical N inputs by 22 and 25%decreased leached N loads by only 9.5%. This study highlights that protected vegetable fields dominated by fluvo-aquic soil need management to curtail leached N losses in northern China.

关键词： agriculture water quality nitrate groundwater irrigation management

Synthesis of tetrasubstituted thiophenes from pyridinium 1,4-zwitterionic thiolates and modified activated alkynes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第12期32卷 3972-3975页

作者： Taimin Wang Xuecheng Zhu Qingqing Tao Wei Xu Haiyan Sun Ping Wu Bin Cheng hongbin zhai Institute of Marine Biomedicine/Hoffmann Institute of Advanced Materials Shenzhen PolytechnicShenzhen 518055China State Key Laboratory of Chemical Oncogenomics Shenzhen Engineering Laboratory of Nano Drug Slow-ReleasePeking University Shenzhen Graduate SchoolShenzhen 518055China Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong Dezhou CollegeDezhou 253023China

Pyridinium 1,4-zwitterionic thiolates were applied to a formal [3+2] annulation reaction with modified activated alkynes, affording various tetrasubstituted thiophenes with aryl, alkenyl, alkyl or silyl group at the special position. The structural modification of alkyne substrates enabled the synthesis of diverse thiophenes to be achieved using the pyridinium 1,4-zwitterionic thiolates as the sulfur-containing building blocks. This approach is metal-free and catalyst-free.

关键词： 1,4-Zwitterionic thiolate Activated alkyne Formal[3+2] Thiophene Metal-free Catalyst-free

在线全文

学校读者我要写书评

暂无评论

可见光诱导的钯催化Heck反应

有机化学 2023年第9期43卷 3035-3054页

作者：徐伟翟宏斌程斌汪太民深圳职业技术学院、海洋生物医药研究院广州深圳518055 北京大学深圳研究生院化学生物学与生物技术学院、化学基因组学重点实验室广州深圳518055

Heck反应作为构建C—C键最为强大和实用的合成工具之一, 经过数十年的发展已逐渐趋于成熟, 并在各种功能分子的合成中获得了极为广泛的应用. 近年来, 随着光催化的兴起, 可见光诱导的钯催化Heck反应也随之快速发展起来. 作为一种新颖的C... 详细信息

Heck反应作为构建C—C键最为强大和实用的合成工具之一, 经过数十年的发展已逐渐趋于成熟, 并在各种功能分子的合成中获得了极为广泛的应用. 近年来, 随着光催化的兴起, 可见光诱导的钯催化Heck反应也随之快速发展起来. 作为一种新颖的C—C键构建策略, 可见光诱导的Heck反应极大地扩展了底物的适用范围, 包括亲核试剂和亲电试剂. 同时, 这种由激发态钯络合物引发, 机理上涉及杂化的自由基-PdⅠ物种的特殊反应路径也使得可见光诱导的钯催化Heck反应表现出条件温和、官能团兼容性好以及转化多样性等特点, 是对经典Heck反应的极大补充, 在功能分子的合成以及复杂化合物的后期修饰等方面极具应用潜力. 根据反应亲核/亲电试剂种类, 以及串联反应类型, 对可见光诱导的Heck反应进行归类和总结, 并对部分反应机理进行了简要阐述.

关键词：可见光一价钯物种自由基单电子转移 Heck反应

在线全文

学校读者我要写书评

暂无评论

光诱导铁催化在有机合成中的应用研究进展

有机化学 2023年第4期43卷 1386-1415页

作者：窦谦汪太民房丽晶翟宏斌程斌中国科学院深圳先进技术研究院/生物医药与技术研究所广东深圳518055 深圳职业技术学院/海洋生物医药研究院广东深圳518055 北京大学深圳研究生院/肿瘤化学基因组学国家重点实验室广东深圳518055

近年来,以过渡金属钌和铱络合物为代表的光催化剂的开发和应用为有机合成开启了新篇章,这些过渡金属光催化剂参与的光催化反应为化学键的构筑和有机转化提供了温和高效的新策略.为了丰富光催化剂的种类,拓宽光催化体系的适用范围,发展... 详细信息

近年来,以过渡金属钌和铱络合物为代表的光催化剂的开发和应用为有机合成开启了新篇章,这些过渡金属光催化剂参与的光催化反应为化学键的构筑和有机转化提供了温和高效的新策略.为了丰富光催化剂的种类,拓宽光催化体系的适用范围,发展绿色可持续化学,近年来一些廉价易得的过渡金属比如铜、铁等被相继开发用作光催化剂.其中,铁催化剂因其无毒、种类丰富,并且具有独特的配体-金属电荷转移性质,在光催化合成领域大放异彩.依据反应类型对光诱导铁催化反应进行了综述,主要包括C—H键官能团化反应、C-C键官能团化反应、烯烃双官能团化反应、交叉偶联反应、脱羧官能团化反应、选择性氧化和还原反应.

关键词：光化学铁催化自由基绿色化学有机合成

在线全文

学校读者我要写书评

暂无评论

2002年有机化学闪光点

有机化学 2003年第8期23卷 885-892页

作者：翟宏斌刘志煜中国科学院上海有机化学研究所上海200032

介绍了全球有机化学领域在 2 0 0 2年所取得的重大进展 ,包括“在钯膜上实现由苯到苯酚的直接转化”等 13个闪光点 .

关键词： 2002年有机化学钯膜苯苯酚直接转化五元环炔类化合物二芳基化合物催化剂丙烯酰胺

光催化CO_(2)参与的σ键断裂羧基化反应研究进展

在线全文

学校读者我要写书评

暂无评论

有机化学 2022年第12期42卷 4257-4274页

作者：窦谦汪太民李嗣锋房丽晶翟宏斌程斌深圳职业技术学院海洋生物医药研究院/博士后创新实践基地广东深圳518055 中国科学院深圳先进技术研究院生物医药与技术研究所广东深圳518055 北京大学深圳研究生院肿瘤化学基因组学国家重点实验室广东深圳518055

二氧化碳(CO_(2))作为温室气体的主要成分之一,也是目前最丰富的碳源之一.CO_(2)常常作为C1合成子,通过构建C—C键合成羧酸类化合物.过渡金属催化的发展为CO_(2)的转化和利用提供了有力的工具.为了实现“双碳”战略目标,结合有机化学领... 详细信息

二氧化碳(CO_(2))作为温室气体的主要成分之一,也是目前最丰富的碳源之一.CO_(2)常常作为C1合成子,通过构建C—C键合成羧酸类化合物.过渡金属催化的发展为CO_(2)的转化和利用提供了有力的工具.为了实现“双碳”战略目标,结合有机化学领域的研究热点,发展绿色、可持续的CO_(2)转化和利用技术具有重要意义.近年来,光催化合成技术的发展为CO_(2)的转化和利用提供了新的契机.系统阐述了光催化下CO_(2)参与的C—H、C—O、C—N及C—X键的断键及羧基化反应.

关键词：光催化 CO_(2) σ键断裂羧基化