CYCLIZATION OF 1-ARYL-5-PHENYLPENT-4-EN-2-YN-1-ONES TO 2,3-DIHYDROPYRAN-2-ONES IN TRIFLUOROMETHANESULFONIC ACID

Abstract

Under the action of an excess of trifluoromethanesulfonic acid, 1-aryl-5-phenylpent-4-en-2-yn-1-ones cyclize intramolecularly to 6-aryl-2-phenyl-2,3-dihydropyran-4-ones. The reaction proceeds at room temperature for 1 h with 50–60% yields.

Authors: Anna S. Zalivatskaya, Aleksander А. Golovanov, Aleksander V. Vasilyev*