Results 141 to 150 of about 172,313 (331)

Reaction of aromatic azides with strong acids: formation of fused nitrogen heterocycles and arylamines

open access: yesJournal of the Brazilian Chemical Society, 1999
We describe in this paper the action of trifluoroacetic acid, trifluoromethanesulfonic acid and aluminum chloride upon ortho-substituted aryl azides to form indoles, azepines and arylamines in good yields.
Carvalho Marcia de   +2 more
doaj  

Synthesis of Versatile DNA‐Conjugated Aldehydes by Controlled Oxidation of Amines

open access: yesAngewandte Chemie, EarlyView.
A controlled oxidation strategy enables efficient in situ generation of aldehyde‐functionalized DNAs from DNA‐conjugated amines using O2/laccase/TEMPO. This approach facilitates reversible amine–aldehyde transformations for DNA bioconjugation, and provides access to chemically diverse DNA‐encoded libraries, broadening the toolbox for chemical biology ...
Guixian Zhao   +6 more
wiley   +2 more sources

Isothiourea‐Catalysed Acylative Kinetic and Dynamic Kinetic Resolution of Planar Chiral Paracyclophanols

open access: yesAngewandte Chemie, EarlyView.
The highly selective acylative (dynamic) kinetic resolution of racemic paracyclophanols catalysed by a chiral isothiourea (5 mol%) is described (up to s = 50 at 49% conversion or up to 98:2 er and 96% yield in 30 examples). Rotational barriers were analysed for paracyclophanols and selected ester products.
Zhanyu Zhou   +4 more
wiley   +2 more sources

Asymmetric Aziridination of Allylic Carbamates Using Ion‐Paired Rhodium Complexes and Extrapolation to C─H Amination of Phenethyl Carbamates

open access: yesAngewandte Chemie, EarlyView.
Aziridination of alkenes is an important route to chiral nitrogen‐containing building blocks. We report that carbamate‐functionalized allylic alcohols undergo highly enantioselective aziridination using achiral dimeric Rh complexes ion‐paired with cinchona alkaloid‐derived chiral cations.
Arthur R. Lit   +4 more
wiley   +2 more sources

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