Enantioselective Silylative Desymmetrization of meso-Indane-1,3-diols Catalyzed by Chiral Guanidines

Chiral guanidine-catalyzed desymmetrization of meso-indan-1,3-diols was achieved via enantioselective silylation by using chlorosilanes in good yields with high selectivity. The combination of chlorosilanes and catalysts was determined by the substituents at the C-2 position on the substrate. It was found that the fused phenyl ring on the substrate was essential for achieving high selectivity. The proposed method was found to be applicable to several types of substrates under optimized reaction conditions. Double silylative kinetic resolution with additive Horeau amplification was observed to establish high selectivity.