Cycloaddition reactions of 2,4-diphenyl-1,3-diazabuta-1,3-dienes with isocyanates and isothiocyanates
作者:Giorgio Abbiati、Alessandro Cirrincione de Carvalho、Elisabetta Rossi
DOI:10.1016/s0040-4020(03)01124-4
日期:2003.9
The cycloadditionreactions 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 reactionmechanism is also discussed.
Construction of 1,2-dihydro-1,3,5-triazines <i>via</i> reactions involving amidines
作者:Honghong Guo、Jianying Lin、Qiang Liu、Xing Li
DOI:10.1039/d3ob00283g
日期:——
synthesized through three sets of reactions of amidines with, respectively, paraformaldehyde, aldehydes and N-arylnitrones under different conditions. The catalysts used in these three reactions were Cu(OAc)2, ZnI2 and CuCl2·2H2O, respectively. Most of the substrates tested for these reactions provided the target products in moderate to good yields. In the reactionsinvolving paraformaldehyde, Cu(OAc)2 also
1,2-Dihydro-1,3,5-triazines from 1,3-Diaza-1,3-butadienes
作者:Elisabetta Rossi、Giorgio Abbiati、Donatella Nava
DOI:10.3987/com-99-8512
日期:——
The 4-aryl-1-(4-methylphenyl)-2-phenyl- and 1-benzyl-2,4-diphenyl-1,3-diaza-1,3-butadienes are nearly quantitatively transformed into the corresponding 1,3,5-triazines when allowed to stand at room temperature in benzene solution. The mechanism of the reaction is discussed.