Synthesis of new mono-N-tosylated diamine ligands based on (R)-(+)-limonene and their application in asymmetric transfer hydrogenation of ketones and imines
作者:Piotr Roszkowski、Jan K. Maurin、Zbigniew Czarnocki
DOI:10.1016/j.tetasy.2013.04.010
日期:2013.6
preparation of a new family of enantiopure mono-N-tosylated-1,2-diamines derived from (R)-(+)-limonene is described. (+)-Limonene was transformed into the appropriate N-tosyl derivative using N-tosylaziridination based on chloramine-T trihydrate. Subsequent ring opening by sodium azide afforded the corresponding isomeric azides. Finally, reduction of the azide function gave enantiomerically pure mono-N-tosylated-1
描述了一种合成方法,该方法可制备新的对映体纯的,衍生自(R)-(+)-柠檬烯的单-N-甲苯磺酰基-1,2-二胺。使用基于氯胺-T三水合物的N-甲苯磺酰基叠氮化将(+)-柠檬烯转化为合适的N-甲苯磺酰基衍生物。随后通过叠氮化钠开环得到相应的异构叠氮化物。最后,叠氮化物功能的降低得到对映体纯的单-N-甲苯磺酸化的1,2-二胺。事实证明,所获得的配体在芳族酮和亚胺的不对称转移氢化方案中是有效的。