Regioselective Synthesis of Polyketide-Type Phenols by Formal [3+3]-Cyclocondensations of 1,3-Bis(silyloxy)-1,3-butadienes with 3-Oxoorthoesters

A variety of 4-methoxysalicylates and related polyketide-type phenols are regioselectively prepared by the first formal [3+3]-cyclocondensations of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-oxoorthoesters.