Sulphinamoylacetates as sulphine precursors. Mechanism of basic hydrolysis and scheme of irreversible inactivation of cinnamoyl alcohol dehydrogenase, an enzyme of the lignification process
presence of general acid catalysis. For t-butyl N-(2-hydroxyphenyl)sulphinamoylisobutyrate where this mechanism of elimination is impossible, a BAc2 attack by hydroxide ion at the sulphur atom takes place. From these mechanisms and the results of complexation of zinc(II) cations by sulphinamoylacetates, a possible scheme for the irreversible inactivation of the title zinc metalloenzyme is proposed
Aminolysis of sulfinamoyl-esters, -sulfonamides and -sulfones. Thiooxamate and thiourea formation via a sulfine intermediate. Thiophilic or carbophilic reaction?
作者:M. Baltas、K. Raouf-Benchekroun、A. De Blic、L. Cazaux、P. Tisnès、L. Gorrichon、K. Hussein、J.-C. Barthelat
DOI:10.1016/0040-4020(96)00919-2
日期:1996.11
The aminolysis process of sulfinamoyl derivatives was investigated with sulfinamoyl esters. An intermediate sulfine was unambiguously evidenced by formation of a Diels-Alder type adduct. The aminolysis leads to final thiooxamate products. A carbophilic addition was suggested for the reaction with secondaryamines. With sulfinamoyl, -sulfones and -sulfonamides, a thiourea is formed resulting from a