Rapid, in situ synthesis of bidentate ligands: chromatography-free generation of catalyst libraries
作者:Robin Frauenlob、Martha M. McCormack、Carolyn M. Walsh、Enda Bergin
DOI:10.1039/c1ob06180a
日期:——
The parallel synthesis of chiral bidentate ligands and their subsequent use in situ for a catalytic process is described. The ligands thus prepared gave comparable results to those obtained when the ligands were synthesized and purified by conventional means. This includes oxazolines and other compounds of similar complexity, meaning that for the first time these valuable compounds have been brought into the field of combinatorial catalysis.
Starting from commercially available (hetero)aromatic nitriles and (1R,2R)-cyclohexane-1,2-diamine, nine NH-imidazolines (hexahydro-1H-benzo[d]imidazoles) were synthesized in good yields. The molecular structures of three imidazolines were confirmed by X-ray analysis. N-Benzylation afforded some of the desired N-benzylimidazolines, but was incompatible with imidazolines that possessed strong electron-accepting
从市售的(杂)芳族腈和(1 R,2 R)-环己烷-1,2-二胺开始,以高收率合成了九种NH-咪唑啉(六氢-1 H-苯并[ d ]咪唑)。通过X射线分析证实了三种咪唑啉的分子结构。N-苄基化提供了一些所需的N-苄基咪唑啉,但与在C2具有强电子接受杂芳族基团的咪唑啉不相容。在后一种情况下,产物在柱色谱法中分解形成N,N'-二取代的环己烷-1,2-二胺。 杂环-咪唑啉-手性池- N的-苄基-稳定性