Amino Acids and Peptides; 581Synthesis of Optically Active 2-(1-Hydroxyalkyl)-thiazole-4-carboxylic Acids and 2-(1-Aminoalkyl)-thiazole-4-carboxylic Acids
Amino Acids and Peptides; 581Synthesis of Optically Active 2-(1-Hydroxyalkyl)-thiazole-4-carboxylic Acids and 2-(1-Aminoalkyl)-thiazole-4-carboxylic Acids
Enzymatic kinetic resolution of racemic cyanohydrins via enantioselective acylation
作者:Qing Xu、Yongli Xie、Xiaohong Geng、Peiran Chen
DOI:10.1016/j.tet.2009.11.074
日期:2010.1
Enzymatickineticresolution of a series of aromatic and aliphatic cyanohydrins in organic media has been investigated. The behavior of potential lipases, molecular sieves, acyl reagent, reaction temperature, and organic solvents on the kineticresolution was studied. The influence of substrate structure, steric, and electronic nature and position of the aryl substituent on the enantioselectivity was
Several aliphatic, aromatic and heteroaromatic aldehydes have been converted into the chiral cyanohydrins using the (S)-hydroxynitrile lyase from Hevea brasiliensis. The corresponding cyanohydrins were obtained in moderate to good yield and high enantiomeric excess with the exeption of phenyloxyacetaldehyde, benzyloxyacetaldehyde and the pyrrole-, pyridine- and indolealdehydes investigated. In contrast
Kinetic resolution of cyanohydrins via enantioselective acylation catalyzed by lipase PS-30
作者:Qing Xu、Xiaohong Geng、Peiran Chen
DOI:10.1016/j.tetlet.2008.08.090
日期:2008.11
By using lipase PS-30 as catalyst, the kinetic resolution of a series of racemic cyanohydrins has been achieved via enantioselective acylation. The values of kinetic enantiomeric ratio (E) reached up to 314. Substituent effect is also briefly discussed. (C) 2008 Elsevier Ltd. All rights reserved.
Amino Acids and Peptides; 58<sup>1</sup>Synthesis of Optically Active 2-(1-Hydroxyalkyl)-thiazole-4-carboxylic Acids and 2-(1-Aminoalkyl)-thiazole-4-carboxylic Acids
作者:U. Schmidt、P. Gleich、H. Griesser、R. Utz
DOI:10.1055/s-1986-31847
日期:——
Two routes are outlined for the synthesis of (R)- or (S)-2-(1-aminoalkyl)-thiazole-4-carboxylic acids starting from commercial available (S)-amino acids.