Chiral base-mediated benzylic functionalisation of tricarbonylchromium(0) complexes of benzylamine derivatives
作者:Susan E. Gibson、Mark H. Smith
DOI:10.1039/b211222c
日期:2003.2.11
1,4-dioxane. Imine derivatives of this complex were readily deprotonated at the benzylic position by diamide 5, and the resultant anions reacted regioselectively with electrophiles (Me3SiCl or MeI) to give fairly good yields of products substituted at the benzylic carbon. Products of up to 87% e.e. were obtained in these reactions, with the highest enantioselectivity being derived from the tert-butyl-substituted
通过在回流的1,4-二恶烷中与Cr(CO)6直接络合,可以以高达66%的收率制备新型络合物(eta 6-苄胺)三羰基铬(0)11。该络合物的亚胺衍生物很容易被二酰胺5在苄基位置去质子化,所得阴离子与亲电试剂(Me3SiCl或MeI)区域选择性反应,得到相当高收率的苄基碳取代的产物。在这些反应中获得了高达87%ee的产物,对映选择性最高的是叔丁基取代的亚胺络合物25。