摘要:
An efficient synthesis of substituted alpha-ureidoalkylphosphonates 3 was reported. The method involves the conversion of alpha-aminoalkylphosphonates 1 to alpha-isocyanatoalkylphosphonates 2 by treating with triphosgene and followed by addition of substituted amine to 2. A new kind of cyclic alpha-ureidoalkylphosphonates 5 was also obtained by treating 2 with o-aminobenzoic acid. followed by intramolecular cyclization of intermediate 4.