The first synthesis of 6-membered cyclic alpha-hydrazinophosphonic acid has been achieved using hetero Dials-Alder adducts. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis of Hexahydropyridazine-3-phosphonic Acid
The synthesis of hexahydropyridazine-3-phosphonic acid (piperidazine-3-phosphonic acid) was performed via a hetero-Diels–Alder reaction followed by Lewis acid-catalyzed phosphonylation. This two-step procedure was improved to a one-pot reaction.