An efficient chirality transfer from the furan ring transfer reaction of the tetrahydrobenzofuranyl allenyl ether followed by angular alkylation via the Claisen rearrangement
Base-catalyzed furan ring transfer reaction of the optically active (S)-tetrahydrobenzofuranyl propargyl etherfollowed by Claisen rearrangement provides effectively the optically active tricyclic furan with S-configuration.