Highly efficient mesoporous base catalyzed Knoevenagel condensation of different aromatic aldehydes with malononitrile and subsequent noncatalytic Diels–Alder reactions

摘要: Abstract Knoevenagel condensation and [4 + 2] cycloaddition reactions are very important class of in synthetic organic chemistry. We have prepared amino-functionalized mesoporous silica through co-condensation 3-aminopropyltriethoxy-silane (APTES) along with tetraethylorthosilicate (TEOS) presence a cationic surfactant CTAB hydrothermally. Small angle powder XRD, HR TEM, FE SEM, N 2 sorption FT IR spectroscopic tools used to characterize the 2D-hexagonal mesostructure identify surface –NH groups material. Our experimental results reveal that is an efficient base catalyst for different aromatic aldehydes malononitrile α,β-unsaturated dicyanides under mild reaction condition ethanol solvent. The isolated obtained further react efficiently cyclopentadiene form series Diels–Alder products excellent yields absence any catalyst.