Recyclization of 2-imino-2H-1-benzopyrans under the influence of nucleophilic reagents. 2. Reaction of 2-iminocoumarin-3-carboxamides witho-aminobenzenesulfonamide

2-Iminocoumarin-3-carboxamides recyclized into 3-(1,1-dioxo-2H-benzo-1,2,4-thiadiazinyl-3)coumarins under the Influence ofo-aminobenzenesulfonamide. An alternative method of synthesis is discussed. Proposed mechanisms for the recyclization are discussed.For part 1. see 1].Ukrainian Pharmaceutical Academy, Khar'kov 310002. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 916–920, July, 1998.