Abstract
New heterogenised silica-based organocatalysts have been prepared via the sol–gel process from two silylated derivatives of L-proline, featuring either a carbamate or an ether linker. Co-gelification with variable amounts of TEOS was performed with and without porogen to yield high surface area solids. These materials were evaluated as heterogeneous phase organocatalysts for the asymmetric aldol reaction of pnitrobenzaldehyde with acetone.