<b>Mesoporous molecular sieve MCM-41 catalyzed one-pot synthesis of 3,4-dihydro-2(1<i>H</i>)-pyrimidinones and –thiones under solvent-free conditions</b>

Short Communication Efficient Sodium Selenate-catalyzed Synthesis of 3,4-dihydro- 2(1h)-pyrimidinones and –thiones under Solvent-free Conditions

Sodium selenate efficiently catalyzes the three-component Biginelli reaction of an aldehyde, a,βketo ester and urea or thiourea under solvent-free conditions to afford the corresponding 3,4-dihydropyrimidin2(1H)-ones or –thiones in excellent yields.

CuCl2 Catalyzed Solvent-free One Pot Synthesis of Dihydropyrimidinones

Nano Mangnesium Aluminate catalyzed one-pot synthesis of 3,4-dihydro-2(1H)-pyrimidinones

An efficient synthesis of 3,4-dihydro-2(1H)-pyrimidinones using NanoMgAl2O4as the catalyst from an aldehyde, βKeto ester, and urea under solvent-free conditions is described.

MCM-41 functionalized sulfonic acid catalyzed one-pot synthesis of 1,8- dioxo-octahydroxanthenes

MCM-41-R-SO3H catalyzed one-pot synthesis of 1,8-dioxo-octahydroxanthenes is reportedunder reflux conditions. The catalyst is easily prepared, highly stable, very simple to handle andrecycled for five times without loss of significant activity

Highly efficient multicomponent Biginelli’s synthesis of 3,4-dihydropyrimidin-2(1H)-ones catalyzed by Al-MCM-41 under solvent-free conditions

In this study, an efficient and green process for the synthesis of dihydropyrimidin-2(1H)-ones from aromatic benzaldehydes, ethyl acetoacetate and urea using Al-MCM-41 as heterogeneous catalyst and microreactor under solvent-free conditions has been developed. The advantages of this method are easy work-up procedure, regeneration of the catalyst, clean and neutral reaction conditions.