On the mechanism of C ⇄ N migration of alkoxycarbonyl groups in reactions of pyridinium ylides with isocyanates
作者:Yu. G. Gololobov、N. V. Kashina、O. A. Linchenko、P. V. Petrovskii、N. P. Gambaryan、W. Friedrichsen
DOI:10.1023/b:rucb.0000011888.26449.21
日期:2003.10
New examples of reversible C ⇄ N migrations of alkoxycarbonyl groups, which occur in the reactions of pyridinium and 3-(diethylcarbamoyl)pyridinium ylides, viz., derivatives of dimethyl and diethyl malonates, with aryl isocyanates were studied. The mechanism of migration of the methoxycarbonyl group from the carbon atom to the nitrogen atom was considered on the basis of quantum-chemical calculations
研究了发生在吡啶鎓和 3-(二乙基氨基甲酰基)吡啶鎓叶立德反应中的烷氧羰基可逆 C ⇄ N 迁移的新例子,即丙二酸二甲酯和二乙酯的衍生物与异氰酸芳基酯的反应。在量子化学计算的基础上考虑了甲氧基羰基从碳原子迁移到氮原子的机制。吡啶鎓叶立德对异氰酸酯基团的初级攻击的产物被确定为以低势垒重排形成氨基甲酸酯,而不会形成环状中间体化合物。