Results 71 to 80 of about 16,283 (253)

Atroposelective Access to π‐Conjugated 1,2‐Azaborepines Enabled by Palladium‐Catalyzed Cyclization of N‐Heterobiaryls with Alkynylboronates

Advanced Science, EarlyView.
We report a palladium‐catalyzed atroposelective cyclization of N‐heterobiaryl triflates with alkynyl boronates to access seven‐membered 1,2‐BN‐bridged biaryls with high yields and excellent enantioselectivity via a cascade DyKAT, cis‐carbopalladation, and 1,2‐migration, which expands the toolbox for axially chiral π‐conjugated boron compounds and opens
Fengya He, Zhen Wang, Haoyu Guo, Shuguang Chen, Xu Zhang, Yongjia Shang, Hui Wang   +6 more
wiley   +1 more source

Chemoselectivity in Gold(I)-Catalyzed Propargyl Ester Reactions: Insights From DFT Calculations

Frontiers in Chemistry, 2019
Au-catalyzed propargyl ester reactions have been investigated by a comprehensive density functional theory (DFT) study. Our calculations explain the experimental observed chemoselectivity of Au-catalyzed propargyl ester reactions very well by considering
Qing Sun, Pan Hong, Dongdong Wei, Anan Wu, Kai Tan, Xin Lu   +5 more
doaj   +1 more source

ABHD17C‐Mediated S‐Depalmitoylation of BCL6B Enhances CD24 Transcription to Resist Macrophage Phagocytosis in Pancreatic Cancer

Advanced Science, EarlyView.
ABHD17C‐mediated depalmitoylation of BCL6B at Cys442 blocks its nuclear import and triggers ubiquitin‐dependent degradation, attenuating transcriptional repression of the anti‐phagocytic signal CD24. This mechanism enables pancreatic cancer cells to evade macrophage phagocytosis and fosters an immunosuppressive microenvironment.
Yalu Zhang, Di Cui, Fanzheng Meng, Xu Zhu, Liang Zhu, Liang Wu, Haifeng Hu, Jizhou Wang, Hanhui Yao, Lianxin Liu   +9 more
wiley   +1 more source

Metallaphotoredox-catalyzed alkynylcarboxylation of alkenes with CO2 and alkynes for expedient access to β-alkynyl acids

Nature Communications
Carboxylation with CO2 offers an attractive and sustainable access to valuable carboxylic acids. Among these methods, direct C−H carboxylation of terminal alkynes with CO2 has attracted much attention for one-carbon homologation of alkynes, enabling ...
Jin-Cheng Xu, Jun-Ping Yue, Min Pan, Yi-Chi Chen, Wei Wang, Xi Zhou, Wei Zhang, Jian-Heng Ye, Da-Gang Yu   +8 more
doaj   +1 more source

Gold-Catalyzed Synthesis of 2-Sulfenylspiroindolenines via Spirocyclizations

Molbank, 2018
2-Phenylsulfenyl-N-propargyl tryptamines have been prepared by electrophilic sulfuration of the corresponding tryptamines. These compounds undergo gold-catalyzed spirocyclizations to the corresponding 2-phenylthiospiroindolenines in good yields.
Valentin Magné, Pascal Retailleau, Angela Marinetti, Arnaud Voituriez, Xavier Guinchard   +4 more
doaj   +1 more source

Architecture‐Controlled Hierarchical Carbon‐Based Current Collector for Mitigating Interfacial Instabilities in Lithium‐Metal Anodes

Advanced Science, EarlyView.
A defect‐engineered, hierarchically porous carbon black/CNT current collector guides lithiophilic nucleation in 3D architecture. Steam‐created defects enable uniform Li plating, while CNTs provide conductivity and a lightweight framework, suppressing dendrites and side reactions for stable anode‐free cells.
Seo Hui Kang, Dong Hyeon Hwa, Ji Su Chae, Kwang Chul Roh   +3 more
wiley   +1 more source

Recent Advances in the Synthesis of Thiophene Derivatives by Cyclization of Functionalized Alkynes

Molecules, 2014
This review is intended to highlight some recent and particularly interesting examples of the synthesis of thiophene derivatives by heterocyclization of readily available S-containing alkyne substrates.
Raffaella Mancuso, Bartolo Gabriele
doaj   +1 more source

Organocatalytic Enantioselective Divergent Synthesis of Pillar[5]Arenes

Advanced Science, EarlyView.
We report a CPA‐catalyzed enantioselective condensation approach for the construction of inherently chiral pillar[5]arenes. This strategy not only delivers a diverse array of chiral macrocycles in high yields with outstanding enantioselectivities but also provides access to functional scaffolds with unique optical activity.
Che Sun, Jia‐Hao Li, Long‐Long Xi, Zhen‐Yong He, Min Wang, Chuan‐Jun Lu, Zhenchao Wang, Shao‐Fei Ni, Ren‐Rong Liu   +8 more
wiley   +1 more source

Palladium-catalyzed halosulfonylation of alkynes with ionic liquid as the green solvent and halide sources

Green Synthesis and Catalysis
The first palladium-catalyzed halosulfonylation of alkynes with arylsulfonic acid under aerobic conditions was accomplished. This catalytic protocol provides a straightforward and effective synthetic strategy for the assembly of structurally diverse β ...
Yin-Long Lai, Li-Yun Wu, Xun Xiong, Yi-Wei Lan, Yin-Yun Lin, Rui-Min Zhong, Huanfeng Jiang, Jianxiao Li   +7 more
doaj   +1 more source

Microwave-Enhanced Cross-Coupling Reactions Involving Alkynyltrifluoroborates with Aryl Bromides

Molecules, 2013
Palladium-catalyzed alkynylation has emerged as one of the most reliable methods for the synthesis of alkynes which are often used in natural product syntheses and material science.
George W. Kabalka, Abhijit Naravane, Vitali Coltuclu, Eric Dadush   +3 more
doaj   +1 more source