Results 51 to 60 of about 2,874,801 (150)

Synthesis of (±)-africanol

Journal of the Brazilian Chemical Society, 2000
Two diastereomers of africanol, compounds 1a and 1b, were obtained exclusively through a methodology which employed, as the key step, the nBuLi mediated intramolecular cyclization of the vinyl iodide 5.
Marques Francisco de A., Ferreira José T. B., Piers Edward   +2 more
doaj  

Strongly Bent Double-Stranded DNA: Reconciling Theory and Experiment

Frontiers in Physics, 2019
The strong bending of polymers is poorly understood. We propose a general quantitative framework of polymer bending that includes both the weak and strong bending regimes on the same footing, based on a single general physical principle.
Aleksander V. Drozdetski, Abhishek Mukhopadhyay, Alexey V. Onufriev, Alexey V. Onufriev, Alexey V. Onufriev   +4 more
doaj   +1 more source

Emergence of terpene cyclization in Artemisia annua

Nature Communications, 2015
The emergence of terpene cyclization was critical to the evolutionary expansion of chemical diversity yet remains unexplored. Here we report the first discovery of an epistatic network of residues that controls the onset of terpene cyclization in ...
Melissa Salmon, C. Laurendon, M. Vardakou, Jitender Cheema, M. Defernez, S. Green, Juan A. Faraldos, P. O'Maille   +7 more
semanticscholar   +1 more source

Improved Protocol Toward 1,3,4-Oxadiazole-2(3H)-thiones and Scale-up Synthesis in the Presence of SDS as a Micelle Promoted Catalyst

Acta Chimica Slovenica, 2015
Convenient procedure for in situ cyclization of hydrazinecarbodithioate potassium salts to 1,3,4-oxadiazole-2(3H)-thiones under normal phase micellar media catalysis promoted by sodium dodecyl sulfate (SDS) as an anionic surfactant is reported.
Ayhan YILDIRIM
doaj   +1 more source

Preparation of Dibenzofurotropones via Pd-Catalyzed Cyclization

Reactions
A synthetic approach to dibenzofurotropone derivatives 1 has been developed through the palladium-catalyzed cyclization of (2-bromoaryl)(3-arylfuran-2-yl)methanones 2 via the activation of arylic C–H bonds.
Yu-Wei Lin, Shiuh-Tzung Liu
doaj   +1 more source

Synthesis of novel 3D-rich α-amino acid-derived 3-pyrazolidinones

Acta Chimica Slovenica, 2017
Synthetic approaches towards novel 3-pyrazolidinone derivatives functionalized at positions N(1) and/or C(5) were studied. 5-Aminoalkyl-3-pyrazolidinones were prepared in four steps from N-protected glycines via Masamune-Claisen homologation, reduction ...
Jaka Glavač, Georg Dahmann, Franc Požgan, Sebastijan Ričko, Bogdan Štefane, Jurij Svete, Uroš Grošelj   +6 more
doaj   +1 more source

Effective synthesis of circRNA via a thermostable T7 RNA polymerase variant as the catalyst

Frontiers in Bioengineering and Biotechnology
Introduction:Circular RNAs (circRNAs) are endogenous noncoding RNAs (ncRNAs) with transcriptional lengths ranging from hundreds to thousands. circRNAs have attracted attention owing to their stable structure and ability to treat complicated diseases. Our
Wei He, Wei He, Xinya Zhang, Yangxiaoyu Zou, Ji Li, Le Chang, Yu-Cai He, Qiuheng Jin, Jianren Ye   +8 more
doaj   +1 more source

Tandem Cu-catalyzed ketenimine formation and intramolecular nucleophile capture: Synthesis of 1,2-dihydro-2-iminoquinolines from 1-(o-acetamidophenyl)propargyl alcohols

Beilstein Journal of Organic Chemistry, 2014
The copper-catalyzed ketenimine formation reaction of 1-(o-acetamidophenyl)propargyl alcohols with various sulfonyl azides is found to undergo a concomitant intramolecular nucleophile attack to generate 1,2-dihydro-2-iminoquinolines after aromatization ...
Gadi Ranjith Kumar, Yalla Kiran Kumar, Ruchir Kant, Maddi Sridhar Reddy   +3 more
doaj   +1 more source

Fluorescent probes based on nucleophilic substitution-cyclization for hydrogen sulfide detection and bioimaging.

Chemistry, 2014
The design, synthesis, properties, and cell imaging applications of a series of 2-pyridyl disulfide based fluorescent probes (WSP1, WSP2, WSP3, WSP4 and WSP5) for hydrogen sulfide detection are reported.
Bo Peng, Wei Chen, Chunrong Liu, E. Rosser, Armando Pacheco, Yu Zhao, Hector C. Aguilar, M. Xian   +7 more
semanticscholar   +1 more source

Synthesis of benzo[d]imidazo[2,1-b]benzoselenoazoles: Cs2CO3-mediated cyclization of 1-(2-bromoaryl)benzimidazoles with selenium

Beilstein Journal of Organic Chemistry, 2019
The synthesis of benzimidazo[2,1-b]benzoselenoazoles is described. The novel ring-closure reaction of 1-(2-bromoaryl)benzimidazoles with Se powder is promoted by Cs2CO3 (2 equiv) in DMF at 150 °C.
Mio Matsumura, Yuki Kitamura, Arisa Yamauchi, Yoshitaka Kanazawa, Yuki Murata, Tadashi Hyodo, Kentaro Yamaguchi, Shuji Yasuike   +7 more
doaj   +1 more source