No abstract

Many syntheses of heterocyclic compounds containing selenium have been extensively investigated because of their interesting reactivities 1 and potential pharmaceutical significance. 2 We are interested in the synthesis of novel heterocyclic compounds containing selenium. 3 We found a new evidence for allenyl selenoketene formation via a [3,3] sigmatropic rearrangement by trapping with primary amines and its cyclization by new pathway. To the best of our knowledge, though there are examples of a ketene-allene cycloaddition in the literature, 4 a selenoketene-allene cycloaddition has not been reported. 5 Reactions with various kinds of secondary amines also were investigated. We describe here the reaction of 2-pentynyl phenylethynyl selenide with primary and secondary amines.

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