An efficient approach has been developed for the synthesis of an isofervenulin analogue 1 employing a one-pot condensation-substitution reaction of a chlorocarboethoxytriazine (electrophile) with a urea (nucleophile). The resulting cyclization reaction resulted in the synthesis of a pyrimido-heterocycle in good yield in either acidic or basic media. The former was assisted by utilizing trimethylsilyl