Regioselective synthesis of functionalized homophthalates by cyclizations of 1,3-bis-(trimethylsiloxy)-1,3-butadienes with α-allenylesters

Reaction of 1,3-bis-(trimethylsiloxy)-1,3-butadienes with α-allenylesters resulted in regioselective formation of functionalized homophthalates which represent useful building blocks for natural product syntheses.