IntramolecularDiels−Alderreactions of chiral 2-silahexa-3,5-dienyl α,β-unsaturated esters have been found to afford tetrahydro-4-silaisochroman-1-ones in moderate yields. The best diastereoselectivity was achieved in the reaction of silatriene 8c, in which methyl and triisopropylsilyloxymethyl groups are attached to the silicon atom, with an acrylate as the dienophile under EtAlCl2-catalyzed conditions