Cyclocondensationof Β-Ketoesters, Aromatic Aldehyde and Urea Is a Key Step Forsynthesis of 3,4-Hydropyrimidin-2-(1H)One.In This Work We Report a Very Simple Procedure For This Conversion By Usingreusable, Heterogeneous Acidic Media Silica Sulphuric Acid In Solvent Freecondition Using Microwave With High Efficiency.