October 1991 Simple Synthetic Routes to 5-(3,6-Dihydro-2-oxo-2#-1,3,4- thiadiazin-5-yl)-l/i-indole -2,3-diones and their Derivatives Isabelle Delimoge, Marcel Morvan, Guy Nadler* and Richard G. Zimmermann* [a] SmithKlinc Beecham, Laboratoires pharmaceutiques, Unité de Recherche, В.P. 58, 35762 Saint Grégoire, France Received January 28, 1991 Two different synthetic routes to 5-(3,6-dihydro-2-oxo-2#-l,3,4-thiadiazin-5-yl)-l//-indole-2,3-diones are ...