Alternating chiral selectivity of aldol reactions under the confined space of mesoporous silicaElectronic supplementary information (ESI) available: Experimental details, characterization, and additional catalytic results. See DOI: 10.1039/c5cc07255g

The chiral selectivities were altered and high diastereo- and enantio-selectivities of the products were obtained in water medium without adding acid co-catalysts when a primary-tertiary diamine catalyst was immobilized on mesoporous SBA-15 to form a recyclable catalyst for the direct asymmetric aldol reaction of cyclohexanone with p -nitrobenzaldehyde. The chiral selectivities were altered and high diastereo- and enantio-selectivities of the products were obtained in water medium without adding acid co-catalysts when a primary-tertiary diamine catalyst was immobilized on mesoporous SBA-15 to form a recyclable catalyst for the direct asymmetric aldol reaction of cyclohexanone with p -nitrobenzaldehyde.