TWO SIX-MEMBERED RINGS ANNELATION TO CYCLIC KETONES THROUGH TWO SEQUENTIAL DIELS–ALDER REACTIONS
A method for the two six-membered rings annelation to cyclic ketones through two sequential Diels–Alder reactions is presented. Naphtho-annelated cycloalkanes with a variety of unsaturation are accessible by choosing the kind of dienophiles, the order of their use, and dehydrogenation.