Short path to the synthesis of bi- and tricyclic compounds containing the 3-oxabicyclo[3.3.0]octene fragment from conjugated enynes by successive AdE reaction and [2+2+1]-cycloaddition

Conclusions A short general scheme was developed for the synthesis of a series of bi- and tricyclic compounds containing a 3-oxa-bicyclo[3.3.0]octane fragment on the basis of the successive acylallyloxylation of the double bond in the hexacarbonyldicobalt complexes of conjugated enynes and subsequent intramolecular [2+2+1]-cycloaddition.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 334–344, February, 1989.