Results 71 to 80 of about 11,513 (251)
New One-Pot Methodologies for the Modification or Synthesis of Alkaloid Scaffolds
Marine Drugs, 2010 There are several avenues by which promising bioactive natural products can be produced in sufficient quantities to enable lead optimization and medicinal chemistry studies. The total synthesis of natural products is an important, but sometimes difficult,
Amir E. Wahba, Mark T. Hamann
doaj +1 more source
Angewandte Chemie, EarlyView.Eine divergente Aldehyd‐Funktionalisierungssequenz, ermöglicht durch ein anomeres Amid, erlaubt den Ein‐Topf‐Zugang zu unsymmetrischen Harnstoffen, Carbamaten, Thiocarbamaten, Thioestern und Amiden. Entscheidend für diese Transformation ist die Bildung von N‐Boc‐Hydroxamat‐Intermediaten, die als Plattformen für eine orthogonale Aktivierung über Lossen ...
Jasper L. Tyler +6 more
wiley +1 more source
Diastereoselective synthesis of some novel benzopyranopyridine derivatives
Beilstein Journal of Organic Chemistry, 2006 BackgroundThe formation of novel N-substituted-1,2,3,4-tetrahydro[1,3]-dioxolo-[6,7]-5H-[1]benzopyrano [3,4-c]pyridines were observed unexpectedly during the acid-mediated ketal removal of ethylenedioxy ketal protected 4-piperidones.
Pradeep K. Mohakhud +6 more
doaj +1 more source
The Synthesis and Biological Activity of 1-Alkyl-4-(3-azacyclobenzoyl)-5-hydroxypyrazole Herbicides
CHIMIA, 2003 The benzoylpyrazoles belong to a class of herbicides that inhibit the enzyme 4-hydroxy-phenylpyruvate dioxygenase (HPPD). This mode of action is characterized by bleaching due to the disruption of plastoquinone and ?-tocopherol biosynthesis ...
Zoltan Benko +8 more
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, 2021 This thesis describes the development of synthetic routes to investigate the relative and absolute stereochemistry of a number of piperidine alkaloids isolated from Microcos Paniculata. This thesis then goes on to explore an intramolecular Diels-Alder reaction, and explores its applicability to natural product synthesis.
openaire +2 more sources
Late‐Stage Functionalization of Peptides on the Solid Phase
Angewandte Chemie International Edition, EarlyView.Peptide modifications are essential to control pharmacodynamic and pharmacokinetic properties of peptide drugs. Consequently, strategies that allow for efficient and rapid incorporation of non‐canonical modifications into peptides in parallel formats are highly sought after.
Marius Werner +2 more
wiley +1 more source
Angewandte Chemie International Edition, EarlyView.An anomeric amide‐enabled divergent aldehyde functionalization sequence provides one‐pot access to unsymmetrical ureas, carbamates, thiocarbamates, thioesters, and amides. Key to this transformation is the formation of N‐Boc‐hydroxamate intermediates, which serve as platforms for orthogonal activation via Lossen‐type rearrangements, single‐electron ...
Jasper L. Tyler +6 more
wiley +1 more source
Research progress of donepezil for treating mild to moderate Alzheimer's disease
Chinese Journal of Contemporary Neurology and Neurosurgery, 2017 Donepezil is the second generation of cholinesterase inhibitors (ChEIs), which has a good effect on mild to moderate Alzheimer's disease (AD). In recent years, there were a lot of studies on the mechanism of donepezil. This paper mainly introduces the
Xin-xin LI, Yun-yun ZHANG, Bin WANG
doaj
Pharmaceuticals Made with Hydrogen: A Sustainable and Efficient Approach Using Flow Synthesis
Chemistry – A European Journal, EarlyView.We demonstrate a sustainable strategy for pharmaceutical manufacturing by combining hydrogen, heterogeneous catalysis, and continuous flow synthesis. The development of novel catalysts and their application in a multi‐step synthesis of donepezil enabled a highly productive process with no intermediate purification.
Shū Kobayashi, Haruro Ishitani
wiley +1 more source
Chemistry – A European Journal, EarlyView.5‐Substituted 2‐(naphthalen‐2‐yl)‐4H‐chromen‐4‐ones are reported as a novel class of highly potent and selective triplex DNA ligands. These ligands induce triplex formation at submicromolar concentrations and inhibit enzymatic activity via ligand‐mediated triplex formation.
Nghia Tran +4 more
wiley +1 more source