“…One of the synthetic method to formation spiro-compounds is ring-closing metathesis (RCM) reaction. Synthesis of spirocyclic pyrimidine-2,4,6triones using RCM was reported [1][2][3], but synthesis of spiroheterocyclic pyrimidine-2,4,6-triones using this type of constructions is not described. Herein we want to report a synthesis of new spiropyrimidine-2,4,6-triones by ring-closing metathesis reactions using a ruthenium-carbene catalyst (Grubbs-Hoveyda).…”