Synthesis of 3-(2-benzyloxy-6-hydroxyphenyl)-1-methylpyrazoles by the reaction of chromones with methylhydrazine
作者:Diana C. G. A. Pinto、Artur M. S. Silva、José A. S. Cavaleiro
DOI:10.1002/jhet.5570370637
日期:2000.11
The 3-(2-benzyloxy-6-hydroxyphenyl)-5-(methyl, phenyl or styryl)pyrazoles were prepared from the reaction of 2-(methyl, phenyl or styryl)chromones with methylhydrazine. The structure of these compounds has been determined by several nmr techniques, and the reaction mechanism is discussed.
5-Hydroxy-2-(phenyl or styryl) chromones: One-pot synthesis and C-6, C-8 13C NMR assignments
作者:Artur M.S. Silva、Diana C.G.A. Pinto、José A.S. Cavaleiro
DOI:10.1016/s0040-4039(00)78214-1
日期:1994.8
A new procedure to synthesise 5-hydroxy derivatives of 2-phenyl- and 2-styrylchromones is reported. The assignments of their C-6 and C-8 atoms, made by proton-coupled 13C and selective INEPT NMR spectroscopy, show that the literature data for such carbon centres must be interchanged.