Chimie des sucres sans groupements protecteurs-II reactions selectives d'addition du -glucose, du -galactose et de -glycosylamines a des heterocumulenes
The conversion of carboxylic acids into isonitriles via selenium-phenyl selenocarbamates
作者:Anthony G. M. Barrett、Hyok Kwon、Eli M. Wallace
DOI:10.1039/c39930001760
日期:——
Carboxylic acids are converted into isonitriles via Schmidt rearrangement of the derived acyl azides, addition of phenylselenol to the resultant isocyanate, tributylstannane reduction and dehydration.
development of the Ir(III)-catalyzed direct C-H amidation of arenes and alkenes using acyl azides as the nitrogen source. This procedure utilizes an in situ generated cationic half-sandwich iridium complex as a catalyst. The reaction takes place under very mild conditions, and a broad range of sp(2) C-H bonds of chelate group-containing arenes and olefins are smoothly amidated with acyl azides without the intervention
Radical substitution with azide: TMSN<sub>3</sub>–PhI(OAc)<sub>2</sub>as a substitute of IN<sub>3</sub>
作者:Christian Marcus Pedersen、Lavinia Georgeta Marinescu、Mikael Bols
DOI:10.1039/b500037h
日期:——
TMSN3 and PhI(OAc)2 were found to promote high-yield azide substitution of ethers, aldehydes and benzal acetals. The reaction is fast and occurs at zero to ambient temperature in acetonitrile. However, it is essential for the reaction that TMSN3 is added subsequent to the mixture of PhI(OAc)2 and the substrate. A primary deuterium kinetic isotope effect was found for the azidonation of benzyl ethers