A FACILE SYNTHESIS OF THIAAZA- AND THIADIAZA-FLUORENE DERIVATIVES INVOLVING BENZOTHIAZOLE-DMAD ZWITTERION WITH ARYLIDENEMALONONITRILES AND N-TOSYLIMINES

摘要

An efficient protocol for the one-pot synthesis of thiaazafluorene and thiadiazafluorene derivatives are described.Contemporaneous to his original contributions which led to the development of 1,3-dipolar cycloadditions as the principal protocol for the synthesis of five membered heterocycles,' Huisgen also laid the foundation for the related 1,4-dipolar cycloadditions.