Substituted 3-aminosydnone imines of the general formula I ##STR1## and their pharmacologically acceptable acid addition salts, in which A denotes an alkylene chain; X denotes one of the groups --O-- or --S--; R.sup.1 denotes e.g. hydrogen; R.sup.2 denotes e.g. an alkyl group, are prepared by cyclization of a compound of the formula II ##STR2## and, if appropriate, subsequent acylation, and have useful pharmacological properties.
X=Y-ZH systems as potential 1,3-dipoles. Part 31. Generation of nitrones from oximes. Background and scope of the tandem 1,2-prototropy-intramolecular cycloaddition sequence.
作者:Ronald Grigg、Frances Heaney、Jasothara Markandu、Sivagnanasundram Surendrakumar、Thornton-Pett Mark、Warnock J. William
DOI:10.1016/s0040-4020(01)86441-3
日期:1991.1
and electronic factors that favour or disfavour such a sequence are discussed. Deuterium labelling studies with an aliphatic oxime rule out the involvement of an enehydroxylamine in the prototropic generation of the NH nitrone.