The reduction of N-hydroxy-α-imino esters with Zn–MsOH in THF afforded α-amino esters in high yields. The reduction of N-hydroxy-α-iminocarbonyl-oligopeptide methylesters prepared from l-phenylalanine and l-leucine di-, tri-, tetrapeptides gave the corresponding S-formed oligopeptide methylesters in moderate diastereoselectivities.
Synthesis and Crystal Structure Analysis of Methyl 2-Hydroxyimino-3-phenyl-propionate
作者:Xiao-liu Li、Xiao-li Zhen、Jian-rong Han、Shouxin Liu
DOI:10.1007/s10870-009-9581-5
日期:2009.12
As precursors of α-amino acids, methyl 2-hydroxyimino-3-phenyl-propionate (F.W. 193.20) was synthesized, characterized by 1H NMR, IR, element analysis and confirmed by X-ray crystal structure analysis. This compound crystallizes in monoclinic class under the space group P21/c with cell parameters, a = 8.6435(17) Å, b = 5.4957(11) Å, c = 21.146(4) Å; β = 97.12(3)°, and Z = 4. The structure exhibits inter-molecular hydrogen bonds of the type O–H···N, O–H···O, C–H···O. The title compound, methyl 2-hydroxyimino-3-phenyl-propionate was synthesized by nitrosation oximation of substituted malonic esters and its crystal structure was determined.