Synthesis and stereochemical analysis of β-nitromethane substituted γ-amino acids and peptides
作者:Mothukuri Ganesh Kumar、Sachitanand M. Mali、Hosahudya N. Gopi
DOI:10.1039/c2ob27070f
日期:——
β-unsaturated γ-amino esters and the Michael addition products suggests that an H–Cγ–CβCα eclipsed conformer of the unsaturated amino ester leads to the major (anti) product compared to that of an N–Cγ–CβCα eclipsed conformer. The major diastereomers were separated and subjected to the peptidesynthesis. The single crystal analysis of the dipeptide containing β-nitromethane substituted γ-aminoacids reveals
Selective Catalytic Hydrogenation of γ-Amino α,β-Unsaturated Esters in the Presence of Hydrogenable Protecting Groups
作者:Domenico Misiti、Giovanni Zappia、Giuliano Delle Monache
DOI:10.1055/s-1999-3471
日期:1999.5
The chemoselective catalytic hydrogenation of substituted γ-amino α,β-unsaturated esters bearing benzyl ether, benzyl ester functionalities and N-Cbz protecting groups by 3% Pd/C in EtOAc was investigated. The results revealed a good selectivity for substrates with benzyl ethers and benzyl esters in the side chain and for α,β-unsaturated benzyl esters. Moderate selectivity was observed for substrates with N-Cbz protecting group.