Novel cyclization of bis-Boc-guanidines: expeditive traceless synthesis of 1,3,5-oxadiazinones under microwave conditions.

A novel intramolecular cyclization was discovered during the reaction of soluble polymer supported bis-Boc-guanidines with amines under microwave irradiation, leading to an oxadiazinone skeleton. The cyclized polymer conjugates have been further utilized to generate substituted 1,3,5-oxadiazinones by a traceless synthesis.