The catalytic, asymmetric intramolecular iodoetherification of ortho-allylphenols was achieved using a multinuclear zinc bis(aminoimino)binaphthoxide complex, generating dihydrobenzofuran compounds in up to 99% yields with 85% ee. Azidation of the chiral compound 2-iodomethyldihydrobenzofuran and a subsequent click reaction with phenylacetylene gave the corresponding triazolesubstituted dihydrobenzofuran while maintaining the original chirality.
Namba et al. (Fri,) studied this question.