Results 141 to 150 of about 1,317 (206)

Metal- and Base-Free Radical Cascade Cyclization/Hydrolysis of CN-Containing 1,6-Enynes with Ethers to Access Polyheterocycles.

Chemistry - An Asian Journal, 2022
A convenient and straightforward approach for the radical cascade cyclization/hydrolysis of CN-containing 1,6-enynes with simple ethers under metal- and base-free conditions is described.
Yan-Nan Zheng, Xuemei Cai, Hongfeng Wu, Yu Zhou, Wen-Chan Tian, Yiping Ruan, Hongxin Liu, Wen‐Ting Wei   +7 more
semanticscholar   +1 more source

Rh(III)-Catalyzed C-H Olefination Cascades to Divergently Construct Diverse Polyheterocycles by Tuning Manipulations of Directing Groups.

Organic Letters, 2021
Inspired by the diversity created by nature, organic chemists have been using a divergent strategy to improve the synthetic efficiency of diverse molecules.
Tianle Huang, Ting Wang, Yuesen Shi, Jian Chen, Xiaoyu Guo, Ruizhi Lai, Xuexin Liu, Zhouping Wu, Dongxue Peng, Longyu Wang, Hao Li, Li Hai, Yong Wu   +12 more
semanticscholar   +1 more source

Photoinduced Phosphorylation/Cyclization of Cyanoaromatics for Divergent Access to Mono- and Diphosphorylated Polyheterocycles.

Organic Letters, 2021
The visible-light-driven switchable phosphorylation of cyanoaromatics with the 1,6-enyne moiety for the diverse and selective synthesis of phosphorylated polyheterocycles, including phosphorylated aminophosphonates, iminophosphonates, and ketones, has ...
Shanshan Shi, Zhipeng Zheng, Yumeng Zhang, Yufei Yang, Denghui Ma, Yuzhen Gao, Yan Liu, Guo Tang, Yufen Zhao   +8 more
semanticscholar   +1 more source

Maximizing Step-Normalized Increases in Molecular Complexity: Formal [4+2+2+2] Photoinduced Cyclization Cascade to Access Polyheterocycles Possessing Privileged Substructures.

Angewandte Chemie, 2021
A new complexity building photoinduced cascade which amounts to an unprecedented formal [4+2+2+2] cycloaddition topology is developed to access complex nitrogen polyheterocycles.
A. Kutateladze, D. Sai Reddy, Ivan M. Novitskiy   +2 more
semanticscholar   +1 more source

Conducting Polyheterocycle Composites Based on Porous Hosts *

Journal of Electronic Materials, 1992
Conducting composites based on porous substrates (cotton fiber, non-woven polypropylene mat and porous crosslinked polystyrene) have been prepared by a two step imbibition technique. First, the substrate was imbibed with a solution of monomer (pyrrole or bithiophene) in acetonitrile, followed by partial drying.
J. S. Park, E. Ruckenstein
openaire   +1 more source

Copper halide mediated synthesis of mesoionic 6-halo-[1,2,3]triazolo[5,1-a]isoquinoliums: further transformation to polyheterocycles

Organic Chemistry Frontiers, 2022
A highly efficient copper halide mediated oxidative cyclohalogenation approach toward mesoionic 6-halo-[1,2,3]triazo[5,1-a]isoquinoliums has been developed. The substrate scope is wide with broad functional group tolerance.
Yang Wu, W. Zhang, Xiaolong Pan, Chuanjun Song, Junbiao Chang   +4 more
semanticscholar   +1 more source

Cascade Pd-Catalyzed Azide-Isocyanide Cross Coupling/Cyclization/Lactamization Reactions for the Synthesis of Tricyclic Guanidine-Containing Polyheterocycles.

Journal of Organic Chemistry
A one-pot synthesis of a tricyclic guanidine scaffold is developed. The azido-bearing [3 + 2] adducts are used for cascade azide-isocyanide cross-coupling/nucleophilic cyclization/lactamization to afford highly condensed polyheterocycles. A wide range of
Xiaoming Ma, Zijie Gao, Jiawei Niu, Sai Zhang, Lingfeng Luo, Shenghu Yan, Qiang Zhang, Wei Zhang   +7 more
semanticscholar   +1 more source

Harnessing Rhodium-Catalyzed C-H Activation: Regioselective Cascade Annulation for Fused Polyheterocycles.

Journal of Organic Chemistry, 2021
In the realm of transition-metal catalyzed arene functionalization, rhodium(III) catalysis is considered as exemplary due to its propensity to activate C-H bonds to obtain comprehensive molecular assembly.
Maneesh Kumar Reddy Singam, Undamatla Suri Babu, Attunuri Nagireddy, J. Nanubolu, Maddi Sridhar Reddy   +4 more
semanticscholar   +1 more source

Thermoplastic polyheterocycles. II: Polyalkylene‐imides

Polymer Engineering & Science, 1994
AbstractPolyalkylene‐imides (i.e., aliphatic‐aromatic polyimides) were prepared smoothly in N‐methyl pyrollidone from straight chain aliphatic diamines and pyrromellitic dianhydride. Melting points of the polymers ranged from about 300 to 450°C, depending of the length of the alkylene chains.
J. Preston, Y. Tropsha
openaire   +1 more source

A carbohydrate based synthetic approach to diverse structurally and stereo-chemically complex chiral polyheterocycles.

Chemistry - An Asian Journal, 2021
Chiral polyheterocycles are one of the most frequently encountered scaffolds in natural products and drugs repertoire. A carbo-hydrate-based diversity oriented synthetic (DOS) approach has been employed for gaining access to many structurally diverse and
B. Roy, Samuzal Bhuyan, Dharmendra Das, Amit Chakraborty, S. Mandal, Kumaraswamy Dhanabal   +5 more
semanticscholar   +1 more source