Author's Organization：Pharmaceutical Institute, Tohoku University Pharmaceutical Institute, Tohoku University Pharmaceutical Institute, Tohoku University Pharmaceutical Institute, Tohoku University
Cyclization of the olefinic β-hydroxy selenide (5) with various catalysts was carried out to give the cyclic compound (9) which was converted to safranal (19) via the olefinic alcohol (14), the diolefinic alcohol (16), and the aldehyde (17).
