Intramolecular [4+2] cycloaddition reactions of indolylalkylpyridazines: synthesis of annulated carbazoles
作者:Norbert Haider、Johann Käferböck
DOI:10.1016/j.tet.2004.06.008
日期:2004.7
Mono- and bicyclic 1,2-diazines tethered to indole dienophiles by alkylene chains were found to undergo thermally induced intramolecular Diels–Alder reactions with inverse electron demand, affording tetra- and pentacyclic condensed carbazoles.
Radicalic Ethoxycarbonylation of 3-Iodopyridazines: An Efficient Access to Tri- and Tetrasubstituted Pyridazines
作者:Norbert Haider、Johann Käferböck
DOI:10.3987/com-00-9004
日期:——
substituents. The limited availability of iodopyridazines other than the 3-iodo and easily accessible 6-substituted 3-iodo derivatives, however, restricts the scope of this reaction type for the synthesis of polyfunctional 1,2-diazines. In particular, only very few iodo-substituted pyridazinecarboxylic acid derivatives have been described so far. Here, we wish to report on a facile and convenient access to