Preparation of chalcogen-containing heterocycles using isoselenocyanates and their relatives

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(1) The cycloaddion of several nucleophiles having a triple bond or an appropriative leaving group with the isoselenocyanates and the relatives was examined. (2) The cycloaddion of the isoselenocyanates having a triple bond (or a leaving group) with some nucleophiles was also carried out. The novel heterocycles containing a chalcogen element (Se, S, Te) were effectively obtained by these two original methods. The application and functionalities (structure and reactivity) were studied. Furthermore, the iodocyclization of these substrates and the nucleophiles was focused to give more functionalized products. The novel iodocyclization of the dichalcogenides was also found to prepare the heterocycles containing a chalcogen element.