A Convergent General Strategy for the Functionalized 2-Aryl Cycloalkyl-Fused Chromans: Intramolecular Hetero-Diels-Alder Reactions of<i>ortho</i>-Quinone Methides
Five and six: 3,4‐Cyclopentyl‐ and cyclohexyl‐fused 2‐arylchromans could be readily prepared from the intramolecular hetero‐Diels–Alder reactions of the corresponding ortho‐quinone methide (o‐QM) precursors tethered to the styrenes under mild reaction conditions. The products were obtained with good to excellent diastereoselectivity (up to>99:1 dr; see scheme; MOM=methoxymethyl).