22668-89-9Relevant articles and documents
Convenient one-pot syntheses of pyrazoles from imines, a vilsmeier type reagent and hydrazine
Katritzky,Denisenko,Denisenko,Arend
, p. 1309 - 1314 (2000)
A simple one-pot procedure for the regioselective synthesis of pyrazoles from readily available starting materials is described. Vilsmeier type reagent 1 reacts with imines 10 (via the corresponding tautomeric secondary enamines) in tetrahydrofuran to give enaminoimine hydrochlorides 11. Nonsymmetrical imines generally react preferentially with 1 at the sterically less hindered α-position. The enaminoimine hydrochlorides 11 are transformed in situ to the corresponding pyrazoles 12 in moderate to high yields by the addition of hydrazine.
Conformational and structural analysis of exocyclic olefins and ketimines by multinuclear magnetic resonance
Montalvo-Gonzalez, Ruben,Montalvo-Gonzalez, J. Ascencion,Ariza-Castolo, Armando
experimental part, p. 907 - 912 (2009/05/09)
The 1H, 13C, and 15N NMR spectra of 5 exocyclic alkenes and 15 different ketimines obtained from cyclohexanone and derivatives using benzyl bromide and primary amines - are analyzed. Relative stereochemical and preferentia