Recently, using organic bases in reaction have gained wide popularity in organic synthesis becomes of its simple work of catalyzing nature and more important selectivity. Among the organic bases, 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) as a non-nucleophilic, sterically hindered, tertiary amine base has been widely demonstrated. In particular; it has been widely used for carrying out a wide range of reactions. The Baylis-Hillman reaction, Nef reaction, Mizuno et al. developed a new chemical fixation of carbon dioxide in the presence of DBU to form substituted 1H-quinazoline-2,4-diones, 14, 15 methylation 16 and benzylation of N-, O-and S-atoms with nontoxic dimethylcarbonate (DMC) and dibenzylcarbonate (DBC), respectively. These also showed the superiority of DBU over the commonly used acylation catalyst 4-(dimethylamino) pyridine in the esterfication of benzoic acid with DMC. 18