Resolution of non-protein amino acids via Carica papaya lipase-catalyzed enantioselective transesterification
摘要:
Carica papaya lipase-catalyzed transesterification of the 2,2,2-ti-ifluoroethyl esters of N-benzyloxycarbonylated DL-amino acids carrying aliphatic side chains proceeded smoothly and, in almost all the cases, enantiospecifically (E = > 200), affording the L-methyl esters and leaving the D-trifluoroethyl esters intact. (c) 2005 Elsevier Ltd. All rights reserved.
<i>Carica papaya</i>Lipase Catalysed Resolution of β-Amino Esters for the Highly Enantioselective Synthesis of (<i>S</i>)-Dapoxetine
作者:Pengyong You、Jian Qiu、Erzheng Su、Dongzhi Wei
DOI:10.1002/ejoc.201201055
日期:2013.1
CPL-catalysed resolution. The mechanism of the CPL-catalysed enantioselective alcoholoysis of the amino acids is discussed to delineate the substrate requirements for CPL-catalysed resolution. Finally, the reaction was scaled up, and the products were separated and obtained in good yields (≥ 80 %). The (S)-3-amino-3-phenylpropanoic acid obtained was used as a key chiral intermediate in the synthesis