Synthesis of chiral imino- and amino-imidazolium salts and of chelating amino-N-heterocyclic carbene palladium(II) complexes
作者:Alexandre Flahaut、Jean-Pierre Baltaze、Sylvain Roland、Pierre Mangeney
DOI:10.1016/j.jorganchem.2006.04.038
日期:2006.8
by X-ray diffraction. Chelating amino-N-heterocyclic carbene dichloro palladium(II) complexes were obtained in two steps via formation of the corresponding silver(I) complexes and reaction of these latters with bis(acetonitrile)dichloropalladium. Crystal structure details of a cis-dichloro amino-imidazol-2-ylidene palladium complex are presented and confirmed the formation of a six-membered Pd-metallocycle
摘要 通过手性伯胺与1-(2-氧代-2-苯基-乙基)-咪唑盐在氯仿中的缩合,开发了一种新的手性亚氨基-咪唑盐制备方法。该反应得到立体选择性优于 95:5 的 (E)-亚氨基-咪唑鎓盐。亚胺的结构通过NMR分析确定。在 MeOH 中用 NaBH4 还原手性 (E)-亚氨基-咪唑鎓盐导致氨基-咪唑鎓盐作为非对映异构体的混合物,选择性范围为 84:16 至 90:10。在某些情况下,主要的非对映异构体可以通过结晶纯化,绝对构型由 X 射线衍射确定。螯合氨基-N-杂环卡宾二氯钯(II) 配合物通过相应的银(I) 配合物的形成和这些后者与双(乙腈)二氯钯的反应分两步获得。提出了顺式-二氯氨基-咪唑-2-亚基钯配合物的晶体结构细节,并证实了六元 Pd-金属环的形成。