Results 41 to 50 of about 14,574 (240)

Analysis of cis-isomer-enriched dihydroquercetin sample by 1D and 2D NMR spectroscopy

Разработка и регистрация лекарственных средств
Introduction. The structure of dihydroquercetin (DHQ) is characterized by two chiral centers at positions 2 and 3 of the benzopyran cycle, resulting in possible diastereomers: trans- and cis-isomers.
R. P. Terekhov, A. Taldaev, E. V. Bocharov, D. I. Pankov, A. D. Savina, I. A. Selivanova   +5 more
doaj   +1 more source

The Synthesis of a Bis(thiosemicarbazone) Macrocyclic Ligand and the Mn(II), Co(II), Zn(II) and ⁶⁸Ga(III) Complexes

Molecules, 2021
A 1,4,7,10-tetraazacyclododecane (cyclen) variant bearing two thiosemicarbazone pendant groups has been prepared. The ligand forms complexes with Mn2+, Co2+ and Zn2+.
Melyssa L. Grieve, Patrick R. W. J. Davey, Craig M. Forsyth, Brett M. Paterson   +3 more
doaj   +1 more source

Breakthrough Design of Highly Potent Antivirals Against Wild‐Type HIV‐1 and Lenacapavir‐Resistant M66I Variant

Angewandte Chemie, EarlyView.
Lenacapavir, the first‐in‐class drug targeting HIV‐1 capsid, is a breakthrough drug in HIV‐1 treatment and prophylaxis. However, a single M66I mutation confers complete viral resistance to lenacapavir. We report herein the design and synthesis of innovative R2 analogs demonstrating low nM potency against HIV‐1 M66I and excellent pharmacokinetics in ...
Nicolas Jamey, D. M. Nirosh Udayanga, Huanchun Zhang, Roshan Katekar, Wei Xie, Shreya M. Ravichandran, Xinyong Cai, Zachary C. Lorson, William M. McFadden, Won Hee Ryu, Jiashu Xie, Karen A. Kirby, Stefan G. Sarafianos, Zhengqiang Wang   +13 more
wiley   +2 more sources

Synthesis and characterization of the diastereomers of HHC and H4CBD

Natural Product Communications, 2023
Abstract The characterization of any compound is important in the field of chemistry. As the field of cannabinoid chemistry grows so does the need for the characterization of new cannabinoids or rare cannabinoids that gain popularity within the consumer and research fields.
Arianna Collins, Giovanni Ramirez, Tesfay Tesfatsion, Kyle P Ray, Scott Caudill, Westley Cruces   +5 more
openaire   +1 more source

Cobalt/Photoredox Catalyzed Desymmetrization of Oxo and Azabicycles via Asymmetric Reductive Coupling With Alkynes

Advanced Science, EarlyView.
A one‐step, asymmetric reductive coupling of alkynes and oxa‐ and aza‐bicyclic olefins using a cobalt/photoredox catalytic system through desymmetrization. ABSTRACT Bicyclo[2.2.1]heptane frameworks represent a privileged structural motif prevalent in numerous natural products and bioactive molecules.
Subhankar Pradhan, Arko Saha, Bholanath Maity, Sayan Dutta, Luigi Cavallo, Basker Sundararaju   +5 more
wiley   +1 more source

Generalizable Strategies for the Synthesis of Cereblon‐Recruiting PROTAC Prodrugs

Angewandte Chemie, EarlyView.
Cereblon‐recruiting PROTACs remain challenging to derivatize for prodrug‐based delivery. In this study, three complementary conjugation strategies enabled the efficient synthesis of cleavable PROTAC prodrugs with tunable release kinetics that can be incorporated into a library of PEGylated constructs and bottlebrush prodrugs.
Aiden X. Wang, Bin Liu, Elise M. Ackerman, Yichen Xiang, Hung V.‐T. Nguyen, Yivan Jiang, Angela N. Koehler, Jeremiah A. Johnson   +7 more
wiley   +2 more sources

Unified Total Synthesis of Pteriatoxins and Their Diastereomers [PDF]

Journal of the American Chemical Society, 2006
A unified total synthesis is reported to access all of the possible diastereomers of pteriatoxins A-C, with the use of an intramolecular Diels-Alder reaction as the key step to form the carbo-macrocyclic core structure. The C34/C35-diol protecting groups were found to have significant effects on both the exo/endo-selectivity and the exo-facial ...
Fumiyoshi, Matsuura, René, Peters, Masahiro, Anada, Scott S, Harried, Junliang, Hao, Yoshito, Kishi   +5 more
openaire   +2 more sources

Diastereomeric Monomers Enable Anion‐Exchange Membranes With Controlled Local Polymer Backbone Flexibility and High Conductivity

Advanced Science, EarlyView.
Stereochemistry enables control of ion‐exchange membrane properties via local backbone flexibility without altering the polymer composition. Syn‐enriched membranes show higher water uptake and improved water‐electrolysis performance, whereas anti‐enriched membranes exhibit higher hydration efficiency and improved mechanical properties.
Si Chen, Xuchen Lyu, Triet Nguyen Dai Luong, Patric Jannasch   +3 more
wiley   +1 more source

Practical Computational Exploration of Chemical Reaction Space: Assessing the Chemical Stability of Active Pharmaceutical Ingredients Under Acidic Conditions

Angewandte Chemie, EarlyView.
Metadynamics simulations drive automated reaction exploration of acid‐catalysed drug degradation, generating a network spanning 1720 species and 2471 elementary steps. QM‐based filtering reduces the network to eight candidate pathways for rigorous DFT refinement and microkinetic modelling.
Julius Seumer, Maria Harris Rasmussen, Oriana Brea, Mikko Muuronen, Andreas H. Göller, Jan H. Jensen   +5 more
wiley   +2 more sources

Assignment of NMR spectral data of diastereomeric tetrahydrofuranyl acetals directly from their mixture by spectral simulation [PDF]

Journal of the Serbian Chemical Society
In this study, an NMR spectral analysis of the mixture of diastereomeric acetals, synthesized from 2,3-dihydrofurane and a racemic mixture of citronellol, was performed.
Nešić Milan S., Nešić Milica D., Radulović Niko S.   +2 more
doaj   +1 more source