Chiral Bicyclic Bridgehead Phosphoramidite (Briphos) Ligands for Asymmetric Rhodium-Catalyzed 1,2- and 1,4-Addition
作者:Ansoo Lee、Hyunwoo Kim
DOI:10.1021/acs.joc.6b00033
日期:2016.5.6
A complementary solution for Rh-catalyzed enantioselective 1,2- and 1,4-arylation with two structurally related chiral ligands is reported. A chiral bicyclic bridgehead phosphoramidite (briphos) ligand derived from 1-aminoindane was efficient for the 1,2-arylation of N-sulfonyl imines, while that derived from 1,2,3,4-tetrahydro-1-naphthylamine was efficient for 1,4-arylation of α,β-unsaturated cyclic
报道了具有两个结构上相关的手性配体的Rh催化对映选择性1,2-和1,4-芳基化的互补溶液。衍生自1-氨基茚满的手性双环桥头亚磷酰胺(briphos)配体对于N-磺酰基亚胺的1,2-芳基化反应有效,而衍生自1,2,3,4-四氢-1-萘胺的手性双环桥头磷酰胺则有效α,β-不饱和环酮的; 4-芳基化。对于α,β-不饱和N-甲苯磺酰基酮亚胺,发现衍生自1-氨基茚满的Briphos选择性地提供了高产率和立体选择性的γ,γ-二芳基N-甲苯磺酰基烯胺。