Lipase-catalyzed dynamic kinetic resolution of hemiaminals
摘要:
The enzymatic dynamic kinetic resolution of N-acylhemiaminals by various lipases, namely, lipase PS, lipase AK and lipase QL, has been investigated. The acetylation of racemic N-acylhemiaminals with lipases exclusively produced the (R)-enantiomers in enantiomerically pure form and quantitative yields. (C) 2003 Elsevier Science Ltd. All rights reserved.
Dynamic kinetic resolution of hemiaminals using a novel DMAP catalyst
作者:Shinji Yamada、Kaori Yamashita
DOI:10.1016/j.tetlet.2007.11.026
日期:2008.1
We describe the first catalytic dynamic kinetic resolution of hemiaminals mediated by an organocatalyst. A 0.1-1 mol % catalyst loading is effective for the dynamic kinetic resolution of hemiaminals to produce esters up to 88% ee in high yields. A 10 mol % catalyst loading resulted in a decreased selectivity, whereas the selectivity increased at 50 degrees C. The absolute configuration is assigned on the basis of the empirical Cotton effect rule. (C) 2007 Elsevier Ltd. All rights reserved.