Synthesis and some properties of heterocyclic amidine derivatives of 3-imidazoline nitroxides
作者:Tatyana A. Berezina、Vladimir A. Reznikov、Leonid B. Volodarsky
DOI:10.1016/s0040-4020(01)81558-1
日期:1993.1
smoothly transformed into amidines - 4-R-amino-2,2,5,5-tetramethyl-3-imidazoline-1-oxyles when treated with nucleophilic reagents. This reaction was applied to the synthesis of some paramagnetic amidines containing various functional groups which may be used as spin labels having a pH-sensitive ESR spectrum. The mechanism of transformation of oxadiazolidines into amidines and the tautomeric equilibrium
2,2,5,5-四甲基-3-咪唑啉-3-氧化物-1-氧基与异氰酸酯的相互作用导致恶二唑烷环加成物平稳转化为am-4-R-氨基-2,2,5,5 -四甲基-3-咪唑啉-1-氧基用亲核试剂处理时。该反应被用于合成一些含有各种官能团的顺磁性which,这些顺磁性am可用作具有pH敏感的ESR光谱的自旋标记。讨论了恶二唑烷转化为transformation的机理以及合成的auto的互变异构平衡。