Results 1 to 10 of about 12,614 (118)

Catalytic asymmetric tandem Heck/Sonogashira reaction enabling access to versatile chiral bridged ring scaffolds [PDF]

Nature Communications
Bridged-ring scaffolds are prevalent in numerous natural products and pharmaceuticals. However, achieving enantioselective construction of these architectures presents a significant challenge, due to the considerable structural strain of the products and
Jing Zhong, Mengxian Li, Changhui Wu, Hui Li, Hongyue Dong, Chunchen Che, Aijun Lin, Hequan Yao   +7 more
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A concise access to bridged [2,2,1] bicyclic lactones with a quaternary stereocenter via stereospecific hydroformylation

Nature Communications, 2021
Enantiomeric bridged [2,2,1] bicyclic lactone skeletons and their ring-opening products are important scaffolds widely occurring in both pharmaceutics and biology active compounds.
Shuailong Li, Zhuangxing Li, Mingzheng Li, Lin He, Xumu Zhang, Hui Lv   +5 more
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A novel energetic framework with the combination of 5,6-fused triazolo-triazine and nitropyrazole-tetrazole for energy-stability balanced explosive

Defence Technology, 2023
In recent years, the introduction of fused rings own high density and low sensitivity has promoted the development of energetic materials. However, the development of energetic compounds containing fused and bridged rings by introducing multiple nitrogen
Cheng-chuang Li, Hao Gu, Jie Tang, Guo-jie Zhang, Guang-bin Cheng, Hong-wei Yang   +5 more
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Potential energetic salts of 5,5′-methylenedi(4H-1,2,4-triazole-3,4-diamine) cation: Synthesis, characterization and detonation performance

Energetic Materials Frontiers, 2022
1,2,3-Triazole and 1,2,4-triazole have been vigorously used in energetic materials research. Among these two, 1,2,4-triazole has been a widely used backbone in designing new energetic materials with improved performance.
Ramling S Mathpati, Abhishek Kumar Yadav, Vikas D Ghule, Srinivas Dharavath   +3 more
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Tripodalsporormielones A–C, unprecedented cage-like polyketides with complex polyvdent bridged and fused ring systems

Acta Pharmaceutica Sinica B, 2021
A chemical investigation on Sporormiella sp. led to the isolation and structural elucidation of tripodalsporormielones A–C (1–3), a new class of polyketide possessing unprecedented cage-like skeletons with polyvdent bridged and fused ring systems.
Guodong Chen, Bingxin Zhao, Meijuan Huang, Jia Tang, Yanbing Li, Liangdong Guo, Rongrong He, Dan Hu, Xinsheng Yao, Hao Gao   +9 more
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5-Nitrotetrazol and 1,2,4-Oxadiazole Methylene-Bridged Energetic Compounds: Synthesis, Crystal Structures and Performances

Molecules, 2021
A new structural type for melt cast materials was designed by linking nitrotetrazole ring with 1,2,4-oxadiazole through a N-CH2-C bridge for the first time. Three N-CH2-C linkage bridged energetic compounds, including 3-((5-nitro-2H-tetrazol-2-yl) methyl)
Jiarong Zhang, Fuqiang Bi, Zhi Yang, Qi Xue, Bozhou Wang   +4 more
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Diels–Alder Adducts of Morphinan-6,8-Dienes and Their Transformations

Molecules, 2022
6,14-ethenomorphinans are semisynthetic opiate derivatives containing an ethylene bridge between positions 6 and 14 in ring-C of the morphine skeleton that imparts a rigid molecular structure.
János Marton, Anikó Fekete, Paul Cumming, Sándor Hosztafi, Pál Mikecz, Gjermund Henriksen   +5 more
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Bioactive Cembranoids from the Soft Coral Sinularia crassa

Marine Drugs, 2011
Eight new cembranoids, crassarines A–H (1–8) were isolated from the Formosan soft coral Sinularia crassa. Compounds 1–3 represent the rare cembranoids with a 1,12-oxa-bridged tetrahydrofuran ring, while 4 and 5 are the firstly discovered 1,11-oxa-bridged
Jyh-Horng Sheu, Chih-Hua Chao, Chi-Hsin Hsu, Yang-Chang Wu, Chang-Feng Dai, Chiung-Yao Huang, Zhi-Hong Wen, Kuei-Ju Chou   +7 more
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Complexes of 2-Amino-3-methylpyridine and 2-Amino-4-methylbenzothiazole with Ag(I) and Cu(II): Structure and Biological Applications

Inorganics, 2023
Coordination complexes (1–4) of 2-amino-4-methylbenzothiazole and 2-amino-3-methylpyridine with Cu(CH3COO)2 and AgNO3 were prepared and characterized by UV/Vis and FT-IR spectroscopy. The molecular structure for single crystals of silver complexes (2 and
Muhammad Hanif, Awal Noor, Mian Muhammad, Farhat Ullah, Muhammad Nawaz Tahir, Gul Shahzada Khan, Ezzat Khan   +6 more
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Metalation Studies on Titanocene Dithiolates

Inorganics, 2018
Titanocene bis-arylthiolates [(C5H4X)(C5H4Y)Ti(SC6H4R)2] (X,Y = H, Cl; R = H, Me) can be prepared from the corresponding titanocene dichlorides by reacting with the thiols in the presence of DABCO as a base.
Tilmann G. Kießling, Karlheinz Sünkel
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