A Convergent General Strategy for the Functionalized 2‐Aryl Cycloalkyl‐Fused Chromans: Intramolecular Hetero‐Diels–Alder Reactions of ortho‐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).