Reaction of the quaternary ammonium salts 2a–i with electrophilic alkenes 3, active alkylating agents 7 or aromatic aldehydes 11, carried out in basic two-phase systems A–D, afforded cyclopropanes 4, cyanoalkenes 8 or cyanooxiranes 12 respectively, via the corresponding ammoniumylides 2+ –. The method is very simple, and gives cyclopropanes 4 and cyanoalkenes 8 in high yield. Under similar conditions
A facile and efficient synthetic route to multi-substituted 2-aminopyridines has been developed via a formal [5C + 1N] annulation of readily available 2,4-pentadienenitriles with hydroxylamine (NH2OH) under very mild conditions, which involves sequential intermolecular aza-nucleophilic addition of hydroxylamine, intramolecular aza-cyclization, and dehydration reactions.
Amine-functionalized bifunctional Co<sup>III</sup>-NHC complexes: highly effective phosphine-free catalysts for the α-alkylation of nitriles
作者:Biswaranjan Boity、Misba Sidiqque、Arnab Rit
DOI:10.1039/d3cc05454c
日期:——
Robust bifunctional CoIII –complexes featuring amine-functionalized NHC ligands have been developed as highly effective catalysts for the nitrile α-alkylation with diverse alcohols, spanning from aliphatic to aromatic including the secondary ones.