59. Synthese von 5,6-Dimethyl-Coxo-l, 3,4,5-tetrahydro-imidazo- [4,5-c] [l, 2,6]thiadiazin-2,2- dioxid und 7-Methyl-4-0x0 -1H-3, Cdihydro- pyrimido[4,5-c] [l, 2,6]thiadiazin-2,2-dioxid *) ... Synthesis of 5,6-Dimethyl-4-oxo-l,3,4,5-tetrahydro-imidazo[4,5-c] ... The derivatives of the above heterocyclic ring systems were prepared by reaction of the corresponding o-amino esters with sulfamoylchloride. ... Vor kurzem berichteten Garcia-Muiioz et al. [l] uber die Synthese ...