Synthesis of Hexasubstituted Carbamimidic Acid Anhydrides and of N1,N1,N2-Trisubstituted Formamidines from 1,1,3-Trisubstituted Ureas

Article abstract of DOI:10.1055/s-1986-31626

1,1,3-Trisubstituted ureas 1 were converted with phosphoryl chloride to hexasubstituted carbamimidic acid anhydrides 2 which were hitherto unknown or difficult to prepare by other methods.The ureas bearing bulky substituents were converted to amidinoyl ch