Dual Behavior of Masked <i>o</i>-Benzoquinones in Intramolecular Diels−Alder Reactions. Expedient Synthesis of Highly Functionalized <i>cis</i>-Decalins from 2-Methoxyphenols
added 2,4-dienol. The majority of the cycloadducts resulted from the diene property of MOBs in intramolecular Diels−Alder reactions smoothly underwent Cope rearrangement to furnish cis-decalins as sole products in excellent to quantitative yields that provides a short and efficiententry to polyfunctionized cis-decalins from2-methoxyphenols. Furthermore, the variation of dienophilic and diene characters