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 chiralligands is reported. A chiral bicyclic bridgehead phosphoramidite (briphos) ligandderived 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
Improved Synthesis of β-Aminoboronate Esters via Copper-Catalyzed Diastereo- and Enantioselective Addition of 1,1-Diborylalkanes to Acyclic Arylaldimines
作者:Jeongho Kim、Chiwon Hwang、Youngmin Kim、Seung Hwan Cho
DOI:10.1021/acs.oprd.9b00179
日期:2019.8.16
scalable procedure to achieve the copper-catalyzed diastereo- and enantioselective 1,2-addition of 1,1-diborylalkanes to N-protected acyclic arylaldimines. We find that the installation of an N,N-dimethylsulfamoyl-group as N-protecting group in acyclic arylaldimines allows the 1,2-addition reaction to proceed with good-to-excellent diastereoselectivity and enantioselectivity, thus providing β-aminoboronate