Efficient dynamic kinetic resolution of arylamines with Pd/layered double-hydroxide-dodecyl sulfate anion for racemization
摘要:
A novel and efficient racemization catalyst, Pd/layered double-hydroxide-dodecyl sulfate anion, was prepared and used in the dynamic kinetic resolution (DKR) of arylamines. The undesired enantiomer was completely racemized at 55 degrees C, allowing the catalyst to be compatible with biocatalysts. DKR proceeded smoothly and showed a broad substrate scope, with good conversion and high product enantiomeric excesses (ee(p)). The system could be reused more than 30 times without loss of conversion and ee(p) value. (C) 2013 Elsevier Ltd. All rights reserved.
Self-disproportionation of enantiomers of non-racemic chiral amine derivatives through achiral chromatography
作者:Tsuyoshi Nakamura、Kaori Tateishi、Shiori Tsukagoshi、Saori Hashimoto、Shotaro Watanabe、Vadim A. Soloshonok、José Luis Aceña、Osamu Kitagawa
DOI:10.1016/j.tet.2012.03.054
日期:2012.5
Efficient self-disproportionation of enantiomers of several non-racemic chiral amines was achieved through conversion to N-acetamides and subsequent MPLC using an achiral column. The MPLC of these non-racemic N-acetamide derivatives gave the chart having a clear boundary between two fractions. Thus, in the less polar fraction, remarkable enantiomerenrichment was observed (>99%ee), while the ee of