128256-22-4Relevant academic research and scientific papers
Cycloaddition reactions of 2,4-diphenyl-1,3-diazabuta-1,3-dienes with isocyanates and isothiocyanates
Abbiati, Giorgio,De Carvalho, Alessandro Cirrincione,Rossi, Elisabetta
, p. 7397 - 7402 (2007/10/03)
The cycloaddition reactions of 1-p-tolyl and 1-benzyl- 2,4-diphenyl-1,3-diazabuta-1,3-dienes with a variety of aryl and alkyl isocyanate and isothiocyanate are described. The reaction mechanism is also discussed.
Reactivity of 1-aryl-4-dimethylamino-2-phenyl-1,3diaza-1,3-butadienes towards dienopheles, 1,3-dipoles and carbanions
Croce, Piero Dalla,Ferraccioli, Raffaella,Rosa, Concetta La
, p. 1309 - 1318 (2007/10/03)
The reactivity of 1-aryl-4-dimethylamino-2-phenyl-1,3-diaza-1,3-butadienes (1) towards dienophiles, 1,3-dipoles and C-nucleophiles was investigated. N-Phenylmethylene-benzenesulfonamide (2), phenylisocyanate (6), C,N-diphenylnitrone (9) and acylacetates (10) reacted with 1 giving quinazoline or pyrimidine derivatives. The possible mechanisms involved in products formation are discussed.
A convenient synthesis of Quinazoline ring by tandem aza-Wittig reaction/electrocyclic ring closure
Rossi,Calabrese,Farma
, p. 5819 - 5834 (2007/10/02)
3,4-D-Dihydroquinazolines and Quinazolines were prepared starting from N'-aryl-N-(triphenylphosphoranilidene)-carboximidamides and aliphatic or aromatic aldehydes. The mechanism of the reaction is discussed.
Quinazolines by electrocyclic ring closure of 1,3-diaza-1,3-dienes
Rossi, Elisabetta,Celentano, Giuseppe,Stradi, Riccardo,Strada, Alberto
, p. 903 - 906 (2007/10/02)
N-imidoyliminotripheny]phosphorane reacts with aliphatic and aromatic aldehydes to give via an 1,3-diaza-1,3-diene intermediate 3,4-dihydro quinazolines and quinazolines. The ratio between the reaction products depends from the aldehyde employed.
