5,7-二硝基喹唑啉-4-酮通过N-,S-和O-亲核试剂进行硝基的亲核置换。与先前研究的二硝基取代的苯并环五元和七元杂环(观察到高度的选择性)相反,这些喹唑啉主要生成区域异构取代产物的混合物。同时,伯胺和仲胺选择性地反应以提供5-氨基喹唑啉酮(peri - substitution)。对于具有相邻的硝基和羰基的一些其他多硝基芳族化合物,观察到类似的效果。这种现象被归因于中间的稳定化围-σ-复杂通过分子内氢键Ñ + NH ... O C.
Synthetic Utilization of Polynitroaromatic Compounds. 6. Remarkable Regioselectivity in Nucleophilic Displacement of Aromatic Nitro Groups with Amines
作者:Konstantine A. Kislyi、Alexander V. Samet、Yuri A. Strelenko、Victor V. Semenov
DOI:10.1021/jo702532x
日期:2008.3.1
5,7-Dinitroquinazoline-4-ones undergo nucleophilic displacement of a nitro group with N-, S-, and O-nucleophiles. In contrast to previously studied dinitro-substituted benzoannulated five- and seven-membered heterocycles (where a high degree of selectivity was observed), these quinazolines mostly yield mixtures of regioisomeric substitution products. At the same time, primary and secondary amines react
5,7-二硝基喹唑啉-4-酮通过N-,S-和O-亲核试剂进行硝基的亲核置换。与先前研究的二硝基取代的苯并环五元和七元杂环(观察到高度的选择性)相反,这些喹唑啉主要生成区域异构取代产物的混合物。同时,伯胺和仲胺选择性地反应以提供5-氨基喹唑啉酮(peri - substitution)。对于具有相邻的硝基和羰基的一些其他多硝基芳族化合物,观察到类似的效果。这种现象被归因于中间的稳定化围-σ-复杂通过分子内氢键Ñ + NH ... O C.