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Synthesis 2003(6): 0906-0914
DOI: 10.1055/s-2003-38685
DOI: 10.1055/s-2003-38685
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York
One-Pot Synthesis of (5-Aminopyrazol-4-yl)-phosphonic Acid Derivatives from 1-Aryl-5-arylcarboxamidopyrazoles through Pyrazolo[4,3-c][1,5,2]-oxazaphosphinines
Weitere Informationen
Received
6 February 2003
Publikationsdatum:
16. April 2003 (online)
Publikationsverlauf
Publikationsdatum:
16. April 2003 (online)

Abstract
1-Aryl-5-arylcarboxamidopyrazoles react with phosphorus(III) halides giving the new heterocyclic system: pyrazolo[4,3-c][1,5,2]oxazaphosphinine. Treatment of pyrazolo[4,3-c][1,5,2]oxazaphosphinines with nucleophilic or electrophilic reagents leads to a cleavage of the oxazaphosphinine ring yielding derivatives of (5-aminopyrazol-4-yl)phosphonic acid.
Key words
1-aryl-5-arylcarboxamidopyrazoles - phosphorus(III) halides - phosphorylation - heterocyclization - ring opening
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