Towards new imidazole-2-thione-based organocatalysts; Sulfur transfer vs. deoxygenation in the reaction of imidazole N-oxides and cycloaliphatic thioketones

摘要

Sulfuration or deoxygenation? Competitive transformations of the title imidazole N-oxides into respective masked thiourea analogs or into the parent heterocycle in the reaction with 2,2,4,4-tetramethylcyclobutane-1,3-dithione are presented. The influence of an electron-withdrawing substituents in combination with the steric hindrance of neighboring groups onto reaction outcome is discussed.