Article
Chemistry, Applied
Raffaella Mancuso, Patrizio Russo, Melania Lettieri, Domenico Santandrea, Corrado Cuocci, Bartolo Gabriele
Summary: Polycyclic heterocyclic derivatives can be synthesized in one step by a carbonylative double cyclization approach, with yields ranging from 45% to 86%, showing promising potential for various applications.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Chemistry, Applied
Bartosz Bisek, Wojciech Chaladaj
Summary: This study describes the Pd-catalyzed tandem cyclization/coupling of internal β-propargylic β-ketoesters with (hetero)aryl bromides. Two protocols are established to selectively produce either 2-benzylidene-dihydrofurans or 2-benzyl-furans. The proposed catalytic cycle involves oxidative addition, substitution of bromide with alkyne, rate-limiting anti-selective 5-exo-dig oxocyclization, deprotonation of the oxonium intermediate, and reductive elimination.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Ramon Arora, Jose F. Rodriguez, Andrew Whyte, Mark Lautens
Summary: A palladium-catalyzed strategy has been proposed for synthesizing unsymmetrically linked heterocycles within stereoselective tetrasubstituted olefins, with high yields and excellent stereoselectivities achieved using low catalyst loadings. Mechanistic studies suggest a syn-carbopalladation of the carbamoyl chloride followed by Pd-II-catalyzed cyclization of alkyne-tethered nucleophiles.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Raffaella Mancuso, Alex De Salvo, Patrizio Russo, Aurelia Falcicchio, Nicola Della Ca, Leonardo Pantoja Munoz, Bartolo Gabriele
Summary: The PdI2/KI-catalyzed oxidative carbonylation of 4-(2-aminophenyl)-3-yn-1-ols selectively produces dihydrofuroquinolinone derivatives in fair to high yields (60%-89%) and excellent turnover numbers (180-267 mol of product per mol of Pd) over 19 examples. This reaction involves the catalytic construction of two rings and three new bonds in one step, providing high value added fused heterocyclic structures from readily available materials.
CHINESE JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Organic
Swapnil V. V. Halnor, Pawan S. S. Dhote, Chepuri V. V. Ramana
Summary: A new catalytic method has been developed to construct the quinobenzoxazine core by employing gold-catalyzed cyclization of o-azidoacetylenic ketones in the presence of anthranils. The process involves a 6-endo-dig cyclization of o-azidoacetylenic ketone catalyzed by gold, leading to the formation of an alpha-imino gold carbene, which then transfers to anthranil to form the 3-aryl-imino-quinoline-4-one intermediate. This intermediate undergoes 6 pi-electrocyclization and aromatization to form the central quinobenzoxazine core. This transformation provides a new and scalable approach to diverse quinobenzoxazine structures under mild reaction conditions.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Dong-Hui Li, Xiao-Bing Lan, A-Xiang Song, Md Mahbubur Rahman, Chang Xu, Fei-Dong Huang, Roman Szostak, Michal Szostak, Feng-Shou Liu
Summary: A new class of large-but-flexible Pd-BIAN-NHC catalysts have been designed for the challenging Buchwald-Hartwig amination of coordinating heterocycles, enabling cross-coupling of a variety of heterocycles with different amines under practical aerobic conditions. The study on the ligand structure and electronic properties of the carbene center will facilitate the discovery of more active catalyst systems based on the unique BIAN-NHC scaffold.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Organic
Zachary D. Tucker, Brandon L. Ashfeld
Summary: The (4+1)-cyclizations are discussed as an underutilized strategy for the formation of five-membered heterocyclic and carbocyclic frameworks. Various methods utilizing oxyphosphonium enolates and Rh-II/Pd-II-metallocarbenes have been analyzed for the synthesis of different compounds.
Article
Chemistry, Physical
Jian-Shu Wang, Jiangjie Zhang, Siqi Wang, Jun Ying, Chuan-Ying Li, Xiao-Feng Wu
Summary: A novel palladium-catalyzed domino carbonylative cyclization has been developed for the rapid construction of functionalized heterocycles. The reaction proceeds smoothly with the consecutive formation of C-C and C-X bonds using benzene-1,3,5-triyl triformate as the CO source, yielding a variety of biologically relevant derivatives.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Applied
Raffaella Mancuso, Patrizio Russo, Rossana Milie, Marzia Dell'Aera, Fedora Grande, Nicola Della Ca
Summary: A Pd-catalyzed carbonylative double cyclization approach to a novel class of S,O-bicyclic heterocycles is presented, allowing the construction of previously unreported compounds with high yields.
Article
Chemistry, Multidisciplinary
Franziska Spruner von Mertz, Ricardo Molenda, Sebastian Boldt, Alexander Villinger, Peter Ehlers, Peter Langer
Summary: A series of previously unknown 5,14-diphenylbenzo[j]naphtho[2,1,8-def][2,7]phenanthrolines, incorporating a 5-azatetracene and a 2-azapyrene subunit, were successfully synthesized using Pd-catalyzed cross-coupling reactions and a one-pot Povarov/cycloisomerization reaction. This synthetic approach enables extensive diversification of the heterocyclic core structure. The optical and electrochemical properties of these compounds were investigated through experimental and computational studies, revealing their closer electronic and optical resemblance to 2-azapyrenes rather than the typical characteristics of 5-azatetracene moieties.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Multidisciplinary Sciences
Kemiao Hong, Yi Zhou, Haoxuan Yuan, Zhijing Zhang, Jingjing Huang, Shanliang Dong, Wenhao Hu, Zhi-Xiang Yu, Xinfang Xu
Summary: This study reports a Rh-catalyzed reaction for the direct synthesis of furan-fused cyclobutanone compounds. DFT calculations reveal the reaction mechanism and the importance of using less reactive catalysts for high selectivity. This method allows the synthesis of previously inaccessible and unknown versatile synthetic blocks, while exhibiting anticancer activity.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Suchen Zou, Zeyu Zhao, Hanmin Huang
Summary: In this study, a novel and efficient palladium-catalyzed reaction was developed for the regioselective and stereodivergent ring-closing of aminoenynes with aldehydes and boronic acids or hydrosilane. The reaction allows for the synthesis of a series of exocyclic 1,3-dienes bearing saturated N-heterocycles of 5- to 8-membered rings. It utilizes a simple Pd-catalyst and works under mild reaction conditions with a broad range of substrates. The resulting products serve as useful intermediates for chemical synthesis due to the versatility of the conjugated diene. Preliminary mechanistic details of the reaction are also uncovered.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Organic
Chengqiang Cao, Yi Yang, Xin Li, Yunxia Liu, Hui Liu, Zengdian Zhao, Lei Chen
Summary: The reaction, catalyzed by palladium, efficiently constructs two new bonds with high yields, while the alkene group is easily functionalized, leading to the formation of products with a unique structure that is difficult to synthesize.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Organic
Sami Chniti, Laszlo Kollar, Attila Benyei, Agnes Dornyei, Attila Takacs
Summary: Novel N-substituted pyrrolo[3,4-b]quinoline-1,3-diones have been synthesized successfully through a highly selective palladium-catalyzed carbonylative imidazation-cyclization reaction. This method, applied for the first time to access original scaffolds, involves 3-bromo-2-iodoquinoline as a typical partner, primary amines, and atmospheric or high carbon monoxide pressure. The use of bidentate ligands such as XantPhos and dppp in atmospheric or high-pressure conditions provides a wide range of carbonylated compounds with good to excellent yields (up to 82%). Furthermore, new quinoline-2,3-dicarboxamides have been isolated as side products in very low yields and have been fully characterized. The solid state structures of three synthesized acridinimides have been unequivocally established by single-crystal XRD analysis.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Applied
Hayeon Kwak, Eunsu Kang, Jae Yeong Song, Geunhee Kang, Jung Min Joo
Summary: The development of modular approaches for heteroaromatic cores and substituents is crucial for drug candidates and organic functional materials. A new strategy involving the cyclization of heteroarenes tethered with alkynes through a norbornene bridge was developed. The Pd catalytic system transformed a variety of five-membered heteroarenes to the corresponding benzofused products, demonstrating its versatility in the annulation of (hetero)aromatic rings.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Computer Science, Artificial Intelligence
Jiangxin Yang, Lingyu Wang, Lifei Ren, Yanpeng Cao, Yanlong Cao
Summary: This paper proposes an end-to-end light field angular super-resolution network by exploiting structure and scene information to mitigate the trade-off between angular and spatial resolution. It utilizes a Light Field ResBlock to extract epipolar plane image features and scene features, and employs 4D deconvolution to upsample the angular resolution based on these features. The refinement network further exploits LF structure and scene information to alleviate artifacts induced by too little angular information.
APPLIED INTELLIGENCE
(2023)
Article
Computer Science, Artificial Intelligence
Yanlong Cao, Lingyu Wang, Lifei Ren, Jiangxin Yang, Yanpeng Cao
Summary: This paper proposes a view position prior-supervised light field angular super-resolution network to improve the trade-off between angular and spatial resolution in light field imaging. The asymmetric feature extraction block and spatial-angular interaction module are introduced to enhance feature extraction and establish view correlations. Experimental results demonstrate the superiority of the proposed method in various datasets.
Article
Engineering, Electrical & Electronic
Junwen Zhang, Guoqiang Li, Sizhe Xing, Nan Chi
Summary: With the adoption of the single-wavelength 50G PON standard, research on the next-generation optical access network beyond 50G has begun. Coherent passive optical network (C-PON) based on multi-access coherent optics and DSP is a promising candidate for future high-speed PON, thanks to its superior sensitivity. This paper reviews recent studies and progress on flexible C-PON in terms of access speed, multiple-access architecture, and deployment scenarios.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Optics
Yanlong Cao, Wenbin Zhu, Jiangxin Yang, Guizhong Fu, Dongyun Lin, Yanpeng Cao
Summary: Visual surface defect inspection is important for assessing product quality in various industrial applications, but it remains challenging to develop deep-learning-based approaches for industrial product defect inspection. To overcome this challenge, we propose a light-weight defect classification model based on pre-trained SqueezeNet architecture and introduce three effective techniques to achieve high accuracy with limited defective training samples. Experimental results validate the effectiveness of our method.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Optics
Yanpeng Cao, Rui Liang, Wenbin Zhu, Bowen Zhao, Haotian Chen, Lingfeng Shen, Jiangxin Yang, Yanlong Cao, Jian Chen, Xin Li
Summary: This paper presents a complete framework for rendering and processing dynamic-excitation-based steady-state NLOS images. A virtual rendering pipeline is constructed to generate large-scale rendered images, and a physical hardware setup is built to acquire real-captured images. An end-to-end multi-branch CNN is proposed to reconstruct specular-reflected images of hidden objects. The effectiveness of the method is validated through qualitative and quantitative experiments.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Computer Science, Artificial Intelligence
Zewei He, Du Chen, Yanpeng Cao, Jiangxin Yang, Yanlong Cao, Xin Li, Siliang Tang, Yueting Zhuang, Zhe-ming Lu
Summary: This study proposes an efficient model, SISR-PF-OA, for single image super-resolution, achieving more accurate and faster image restoration by improving feature extraction and fusion techniques. It includes a novel Orientation-Aware feature extraction/selection Module (OAM) and an effective fusion architecture to progressively integrate multi-scale features extracted in different convolutional stages.
PATTERN RECOGNITION
(2023)
Correction
Cell Biology
Xiaodong Su, Yuan Xie, Junwen Zhang, Mingxin Li, Qing Zhang, Guishan Jin, Fusheng Liu
CELL DEATH & DISEASE
(2023)
Article
Physics, Applied
Yingzhe Wang, Xuefeng Zheng, Tian Zhu, Shaozhong Yue, Ailing Pan, Shengrui Xu, Peixian Li, Xiaohua Ma, Jincheng Zhang, Lixin Guo, Yue Hao
Summary: Degradation and defect evolution in GaN-based UV LEDs under 3 MeV proton irradiation were investigated thoroughly in this study. An intrinsic C-N-related defect with an abnormally decreased concentration after irradiation was identified. A defect evolution model under proton irradiation was established: C atoms departed from the C-N-related defect aligned along the dislocation in the active region stimulated by the displacement damage effect, leaving behind a nitrogen vacancy (V-N) aligned along the dislocation, accompanied by the generation of a non-interacting carbon interstitial (C-i). The increase in V-N and C-i jointly contributed to the decrease in optical power and the increase in leakage current.
APPLIED PHYSICS LETTERS
(2023)
Article
Automation & Control Systems
Wenbin Zhu, Rui Liang, Jiangxin Yang, Yanlong Cao, Guizhong Fu, Yanpeng Cao
Summary: In recent years, diverse detection methods have been proposed to achieve highly accurate image segmentation. However, low contrast and background noise interference still pose challenges to defect detection. Existing deep learning-based methods for defect detection mostly learn rich features on the whole image.
ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE
(2023)
Article
Engineering, Electrical & Electronic
Wenqing Niu, Zengyi Xu, Yu Liu, Xianhao Lin, Jifan Cai, Jianyang Shi, Xiaolan Wang, Guangxu Wang, Jianli Zhang, Fengyi Jiang, Zhixue He, Shaohua Yu, Chao Shen, Junwen Zhang, Nan Chi
Summary: Nowadays, there is a growing demand for high-speed information transmission. Visible light communication (VLC) based on light-emitting diodes (LEDs) is considered a prospective candidate for future 6G communication networks. However, VLC systems face challenges due to limited modulation bandwidth and nonlinear characteristics of optoelectronic devices. This paper outlines the current state and challenges of VLC and introduces key technologies for high-speed VLC systems based on silicon (Si) substrate LED. The paper presents an ultrahigh-speed VLC system with an overall data rate of 28.93 Gbit/s, achieved through optimized LED arrays and advanced digital signal processing methods.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Jianyang Shi, Wenqing Niu, Ziwei Li, Chao Shen, Junwen Zhang, Shaohua Yu, Nan Chi
Summary: This paper proposes a neural network-based auto equalization model (NNAEM) for achieving high-speed underwater visible light communication (VLC) with a bandwidth-limited green LED. Experimental results show that the proposed method enables a data rate of 3.451 Gbps in an underwater VLC link, which is an improvement of 30.4% compared to other advanced digital signal processing (DSP) methods. The scenario adaptation and robustness of the NNAEM are also verified, demonstrating its importance in underwater high-speed VLC transmission.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Fan Liu, Yanlong Cao, Tukun Li, Lifei Ren, Junnan Zhi, Jiangxin Yang, Xiangqian Jiang
Summary: This paper presents a novel fast method called the Iterative Minimum Zone Algorithm (IMZA) for evaluating cylindricity deviation on a large number of measurement points. It is crucial for quality control of high-value products and components when using modern instruments such as roundness testers and 3D laser/CT scanners. The method strictly adheres to the latest ISO definition and shows fast and accurate evaluation of cylindricity deviation with a large number of measurement points, as proven by comparison with typical approaches on both simulated and measured data.
Review
Optics
Xingchen Liu, Junhui Hu, Qijun Bian, Shulan Yi, Yingnan Ma, Jianyang Shi, Ziwei Li, Junwen Zhang, Nan Chi, Chao Shen
Summary: The introduction of visible light communication (VLC) technology can enhance the capacity of existing wireless communication systems for 6G networks by utilizing lighting system infrastructures. Semiconductor light sources such as LEDs and LDs play a crucial role in VLC technology due to their energy-efficiency and long lifespans. Various technologies including injection locking have been employed to achieve high-speed VLC links. This paper provides a comprehensive review on the implementation of the injection-locking technique in optical communication systems, elucidates the enhancement of characteristics through OIL, discusses the applications of OIL in VLC systems, and evaluates the prospects of OIL for future VLC systems.
Article
Computer Science, Hardware & Architecture
Sizhe Xing, Guoqiang Li, An Yan, Wangwei Shen, Zhongya Li, Jiaye Wang, Jianyang Shi, Zhixue He, Nan Chi, Junwen Zhang
Summary: The coherent passive optical network (CPON) has gained attention due to its superior performance. Probabilistic shaping (PS) has been introduced for adaptive rate adjustment in flexible coherent passive optical networks (FLCS-CPON). However, the classical probabilistic shaping (CPS) technology is less efficient in CPON systems without optical amplifiers. This study explores the use cases of PS in FLCS-CPON and demonstrates a hybrid PS-based FLCS-CPON without optical amplifiers, achieving higher peak rate and dynamic range improvement.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Gastroenterology & Hepatology
Peng Li, Zheng Zhang, Sheng Wang, Zhendong Jin, Yiqi Du, Aiming Yang, Yunlu Feng, Xiaoping Zou, Lei Wang, Xiaoyan Wang, Li Tian, Pinghong Zhou, Yiqun Zhang, Jun Liu, Zhen Ding, Junwen Zhang, Jian Yang, Siyu Sun, Shutian Zhang
Summary: This study evaluated the safety and efficacy of the Hot AXIOS system for PFC drainage in a multicenter Chinese cohort. The results showed that stent placement was successful in all patients and 93.3% of patients achieved clinical success within 60 days after surgery. The study found that a previous pancreatitis attack > 6 months prior was associated with a greater chance of achieving 100% remission of PFCs within 1 month.
ENDOSCOPIC ULTRASOUND
(2023)
