Palladium/ClickFerrophos-Catalyzed Asymmetric Domino Allylstannylation–Heck Reaction of o‑Formylaryl Triflate

Asymmetric domino allylstannylation–Heck reaction of o-formylaryl triflates was successively catalyzed by Pd/ClickFerrophos to give the 3-methylene-indan-1-ols in good yields with good to excellent enantioselectivities. The benefit of the reaction is that the starting o-formylaryl triflates are prepared from easily accessible salicylaldehyde derivatives, and the variation of the product, chiral 3-methylene-indan-1-ols, can be expanded. The reaction with 4-substituted substrates gave the corresponding 3-methylene-indan-1-ols in good yields with high enantioselectivities, whereas the reaction with 5- and 6-substituted substrates occasionally afforded the corresponding Stille coupling product in significant amounts along with the desired 3-methylene-indan-1-ols.