Ring Strain and Weak Bonds: Δ<sup>2</sup>-1,2-Diazetines as Building Blocks for Pyridazines
作者:R. Beckert、J. Fleischhauer、W. Günther、H. Görls
DOI:10.1055/s-2006-942524
日期:2006.9
Deprotonated 1,2-diazetines react with various ketones containing an acidic CH to yield pyridazine derivatives. The reaction allows the synthesis of dihydropyridazines containing a cycloamidine substructure via a sequence of ring-opening and recyclization. In this case, the in situ generated anion of 1,2-diazetines acts as a base as well as a chelator. The structures of the novel synthesized derivatives were confirmed by X-ray structural analysis and multidimensional NMR experiments.