Superacid-catalyzed tandem Meyer–Schuster rearrangement/intramolecular hydroamination of <i>o</i>-anilinopropargyl alcohols for the synthesis of 2,3-dihydro-4(1H)-quinolones
A TfOH-catalyzed synthesis of 2,3-dihydro-4(1H)-quinolones from o-anilinopropargyl alcohols was developed. Studies of N-protecting groups and substituents in phenyl rings showed that diverse groups could be applied. By controlling the catalyst loading, o-anilinopropargyl alcohols underwent the expected transformation smoothly to produce N-protected or N-deprotected 2,3-dihydro-4 (1H)-quinolones in good
N-Propargylation and Copper(I)-Catalyzed Azide-Alkyne Cycloaddition as a Convenient Strategy for Directed Post-Synthetic Modification of 4-Oxo-1,4-Dihydrocinnoline Derivatives
作者:Vladimir N. Mikhaylov、Artem O. Pavlov、Yaroslav V. Ogorodnov、Dar’ya V. Spiridonova、Viktor N. Sorokoumov、Irina A. Balova
DOI:10.1007/s10593-020-02750-0
日期:2020.7
propargylation and copper(I)-catalyzedazide-alkynecycloaddition reactions. The propargylation of 4-oxo- 1,4-dihydrocinnolines with propargyl bromide in the presence of various bases proceeded regioselectively at the cinnolinone N-1 atom. In the cycloaddition reaction of N-propargylcinnolinones and benzyl azide, the highest catalytic activity of copper(I) N-heterocyclic carbene complex [(IMes)Cu(Br,I)] was observed