Synthesis of imidazoles via hetero-Cope rearrangements
摘要:
A novel synthetic approach to heterocycles containing the imidazole moiety based on the multihetero-Cope rearrangement is described. Oximes are reacted with benzenecarboximidoyl chlorides 4 affording adducts that readily undergo the hetero-Cope rearrangement at slightly elevated temperatures. Acid treatment of the resulting amidines 8 provides imidazoles in very high yields.
Intermolecular interactions that determine the regioselectivity in 1,3-dipolar cycloadditions ofN-methyl-1,3-oxazolium-5-olates withN-(phenylmethylene)benzenesulphonamide
作者:L. Bonati、R. Ferraccioli、G. Moro
DOI:10.1002/poc.610080703
日期:1995.7
1,3-Dipolar cycloadditions of N-(phenylmethylene)benzenesulphonamide with mesionic N-methyl-1,3-oxazolium-5-olates give 2,5-disubstituted imidazole derivatives with high regioselectivity. The intermolecular interactions underlying this regioselectivity were investigated. The conformational and electronic properties of the reagents were characterized separately. The approach in the early stages of the