Amine-Salt-Controlled, Catalytic Asymmetric Conjugate Addition of Various Amines and Asymmetric Protonation
摘要:
The combined use of chiral Pd complex 2 and amine salt enabled completely regulated release of free nucleophilic amine. Under these conditions, an efficient catalytic asymmetric conjugate addition of various amines was achieved to afford beta-amino acid derivatives in high chemical yields with up to 98% ee. Furthermore, a highly enantioselective protonation in 1,4-addition of amine was also developed.
A novel chiral BINOL–silica hybrid has been successfully prepared by the reaction of (S)-BINOL and SiCl4 following by gel polymerization under atmosphere condition. The synthesized catalyst was characterized by elemental analysis, Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Catalytic activity of the chiral BINOL–silica
Enantioselective addition of amines to alkenoyl-N-oxazolidinones
作者:Kelin Li、Pim Huat Phua、King Kuok (Mimi) Hii
DOI:10.1016/j.tet.2005.03.125
日期:2005.6
Investigations of cationic Pd(II) complex 1 as hydroamination catalysts led to the development of highly enantioselectiveaddition of aromatic amines to alkenoyl-N-oxazolidinones, with ee values up to 93%. Factors affecting the yield and selectivity of the reaction were described. Addition of substituted benzylamines to these Michael acceptors was also attempted, and was found to be reversible under
[EN] PROCESS FOR PRODUCING OPTICALLY ACTIIVE BETA-AMINO ACID DERIVATIVES<br/>[FR] PROCEDE POUR PRODUIRE DES DERIVES D'ACIDES AMINES BETA A ACTIVITE OPTIQUE