Results 151 to 160 of about 83,038 (344)
Phosphoramidate and Silyl Amine Mediated Synthesis of Isocyanide Cyclopentadienone Iron Complexes
Helvetica Chimica Acta, EarlyView.Carbonyl ligands in cyclopentadienone iron complexes are replaced by isocyanide ligands without using free, malodorous isocyanides. The reaction takes place via an Aza‐Wittig‐type reaction starting from primary amines, employing either phosphoramidates or silyl amines as intermediate reagents.
André Bütikofer +3 more
wiley +1 more source
Angewandte Chemie, Volume 138, Issue 4, 22 January 2026.An intramolecular Mannich reaction (A/B/E/F rings) and intermolecular Diels–Alder reactions (C/D rings) afforded a cage‐like hexacyclic core skeleton of denudatine alkaloids. Derivatization of the hexacyclic intermediate enabled the first asymmetric total syntheses of four denudatine alkaloids: (–)‐cochlearenine, (–)‐macrocentrine, (–)‐dictizine, and (–
Shun Kawano +5 more
wiley +2 more sources
Diastereoselective 1,3-dipolar cycloaddition of pyrylium ylides with chiral enamides
, 2012 Kirill Tchabanenko +3 more
openalex +2 more sources
ChemistryOpen, EarlyView.2,3‐Dichloro‐5,6‐dicyano‐1,4‐benzoquinone serves as a versatile oxidant and redox catalyst for CC bond formation through hydride abstraction or single‐electron transfer. Stoichiometric and catalytic systems enable benzylic, allylic, and aromatic CH activation under mild, metal‐free conditions, providing sustainable routes to complex and bioactive ...
Dohoon Cha, Sun‐Joon Min
wiley +1 more source
Recent Advances in Bioconjugation of Aromatic Amino Acid Residues by a Reactivity‐Guided Approach
The Chemical Record, EarlyView.This review highlights recent advances in the bioconjugation of aromatic amino acids residues, focusing on strategies that leverage their inherent chemical reactivity to enable precise and versatile modifications of biomacromolecules, illustrating relevant applications.
Bruno M. da S. Santos +3 more
wiley +1 more source
CHIMIA, 1993 Optically active 3-hydroxybutyric and 3-hydroxyhexanoic acids were transformed into 3,4-disubstituted and 3,3,4-trisubstituted 2-oxetanones using two different approaches.
Günter Scherowsky, Michael Sefkow
doaj +2 more sources
Journal of the Brazilian Chemical Society, 1999 Experiments towards the diastereoselective coupling of new malonic acid amides synthesized with commercially available chiral amines [(S)-(+)-1-cyclohexylethylamine and (R)-(+)-1-phenylethylamine] as chiral auxiliaries were performed through Kolbe ...
Goulart Marília O.F. +1 more
doaj
Benzochromanone and Benzochromene Natural Products: Synthetic Strategies and Total Syntheses
The Chemical Record, EarlyView.This work outlines synthetic strategies for natural products with benzochromanone and benzochromene cores. Key achievements include total syntheses of xanthones, blennolide C, gonytolide C, and teretifolione B. Spirochromanone intermediates, benzyne–furan Diels–Alder reactions, and enzymatic resolution enabled efficient and enantioselective access to ...
Takuya Kumamoto
wiley +1 more source
Turn‐Induction in Peptides Incorporating Novel Cyrene‐Derived α,α‐Disubstituted Amino Acid
Journal of Peptide Science, Volume 32, Issue 3, March 2026.Novel chiral cyrene‐derived Cyr residues were incorporated into peptides. The α,α‐disubstituted amino acid residue was introduced using the Ugi reaction. X‐ray crystallographic analysis of R‐ and S‐Cyr residues indicated preference to adopt left‐ and right‐handed α‐helical conformations, respectively.
Kajumee Bora Bhowal +2 more
wiley +1 more source