Homochiral amine synthesis by baker's yeast resolution of a β-keto amide: 1-Phenylethylamine
摘要:
Preliminary investigation of the resolution potential of baker's yeast reduction of beta-keto amides has been carried out with 1-phenylethylamine. Enantiomeric excess was determined by direct comparison of resolved enantiomers with derivatives prepared from commercially available (R)-(+)-1-phenylethylamine and was found to be 56-58.6% for the S enantiomer and 76-84.6% for the R enantiomer.
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
Dynamic kinetic resolution of amines by using palladium nanoparticles confined inside the cages of amine-modified MIL-101 and lipase
作者:Sen Xu、Meng Wang、Bo Feng、Xinchen Han、Zijie Lan、Huajun Gu、Hexing Li、Hui Li
DOI:10.1016/j.jcat.2018.04.006
日期:2018.7
Dynamickineticresolution (DKR) of amines is an important strategy for the synthesis of chiral drugs and their building blocks; however, improving the matchability of metal-catalyzed racemization and enzymatic resolution is still a task. In this paper, Pd nanoparticles (NPs) were encapsulated inside the cages of ethylenediamine-grafted MIL-101 (ED-MIL-101), giving highly efficient catalysts (Pd/ED-MIL-101)
Mammalian Alkaloids: Configurations of Optically Active Salsoline- and 3′,4′-Dideoxynorlaudanosoline-1-carboxylic Acids
作者:Maria Chrzanowska、Bernhard Schönenberger、Arnold Brossi、Judith L. Flippen-Anderson
DOI:10.1002/hlca.19870700707
日期:1987.11.4
absolute configuration of the reaction products was established by X-ray analysis of the opticallyactive hydantoin (+)-8A. Hydrolysis of the methyl isoquinolinecarboxylates 2A,B with 48% HBr soln. at reflux afforded the desired opticallyactive 3′,4′-dideoxynorlaudanosoline-1-carboxylic acids 1A,B required for enzyme-inhibition studies. Details of the X-ray diffraction analysis of (+)-methyl salsoline-1-carboxylate
preparative synthesis, but additionally the catalytic mechanism was discussed and the clear impact of this rarely observed carbonate-derived acyl enzyme was shown. The presented protocol is characterized by atom efficiency, acyldonor sustainability, easy acyl group removal, mild reaction conditions, and biocatalyst recyclability, which significantly decreases the cost of the reported process.