Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12779/5506
Title: Reaction of 1,2-Diaza-1,3-butadienes with Aminophosphorus Nucleophiles: A Practical Access to New Phosphorylated Pyrazolones
Authors: ATTANASI O., A
Baccolini, G
Boga, C
DE CRESCENTINI, L
Giorgi, Gianluca 
Mantellini, F
Nicolini, S.
Issue Date: 2008
Project: None 
Journal: EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Abstract: 
The reaction of 1,2-diaza-1,3-butadienes with dibenzyl diisopropylphosphoramidite, methyl tetraisopropylphosphorodiamidite or tris(dimethylamino)phosphane under solventfree conditions gave stable α-phosphoranylidene-hydrazones that, in turn, were transformed into the corresponding 5-oxo-4-phosphoranylidene-4,5-dihydro-1H-pyrazoles. X-ray diffraction analysis of one of these derivatives is reported. α-Phosphoranylidene-hydrazones, derived from the reaction between 1,2-diaza-1,3-butadienes with dibenzyl diisopropylphosphoramidite, were converted by hydrolytic cleavage into (E)-hydrazono-phosphonates, which are useful for the preparation of the corresponding (3-oxo-2,3-dihydro-1H-pyrazol-4- yl)phosphonamidates.
Description: 
23337
URI: http://hdl.handle.net/20.500.12779/5506
ISSN: 1434-193X
DOI: 10.1002/ejoc.200800856
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