o.Formylarylazomethylenetriphenylphosphoranes: A facile thermally promoted rearrangement to 3-oxo-indazoline and 4-oxo-dihydroquinazoline derivatives
作者:A. Alemagna、P. Del Buttero、E. Licandro、S. Maiorana、A. Papagni
DOI:10.1016/s0040-4020(01)96683-9
日期:——
s carrying an electron withdrawing group on the ylidic carbon undergo thermal intra molecular cyclization to 3-oxo-indazolin-2-yl-methylenetriphenylphosphorane derivatives. The latter compounds, and their 1-alkyl derivatives, in turn, undergo thermal and/or acid catalyzed rearrangement to 4-oxo-l,4-dihydroquinazoline derivatives and PPh3. Some possible reaction mechanisms are discussed, and some synthetic
在内基碳上带有吸电子基团的邻甲酰基芳基偶氮亚甲基三苯基膦被热分子内环化为3-氧代-吲唑啉-2-基-亚甲基三苯基膦烷衍生物。后者的化合物及其1-烷基衍生物又经历热和/或酸催化的重排,生成4-氧代-1,4-二氢喹唑啉衍生物和PPh 3。讨论了一些可能的反应机理,并显示了上述反应的一些合成应用。