An<i>Atropos</i>Biphenyl Bisphosphine Ligand with 2,2′-<i>tert</i>-Butylmethylphosphino Groups for the Rhodium-Catalyzed Asymmetric Hydrogenation of Enol Esters
calculations described in our previous work. This P‐stereogenic bisphosphine ligand possessing a biphenyl backbone and 2,2′‐tert‐butylmethylphosphino groups has been applied to the Rh‐catalyzedasymmetric hydrogenation of enol esters, which has not been widely studied and can be used for the synthesis of several important bioactive compounds. Although there is room for further improvement in enantioselectivity
Novel approach to the synthesis of aliphatic and aromatic α-keto acids
作者:Daniele Balducci、Philip A. Conway、Giulia Sapuppo、Helge Müller-Bunz、Francesca Paradisi
DOI:10.1016/j.tet.2012.06.078
日期:2012.9
A new practical and efficient synthesis of alpha-keto acids was accomplished starting from the synthon 1,4-diacetylpiperazine-2,5-dione. The synthesis encompasses both aromatic and aliphatic substrates proving to be versatile and innovative with excellent carbon economy and recycling of the glycine by-product. (C) 2012 Elsevier Ltd. All rights reserved.
Antioxidant properties of 3-hydroxycoumarin derivatives
A series of hydroxylated 3-hydroxycoumarins was synthesised by the reaction of 3-aryl-2-hydroxypropenoic derivatives with boron tribromide. They were evaluated for their ability to scavenge the 2,2-diphenyl-1-picrylhydrazyl radical, the superoxide anion radical, the hydroxyl radical and the peroxynitrite anion and to inhibit copper-induced human LDL peroxidation. The physicochemical results were in
Single-Biocatalyst Synthesis of Enantiopure<scp>d</scp>-Arylalanines Exploiting an Engineered<scp>d</scp>-Amino Acid Dehydrogenase
作者:Fabio Parmeggiani、Syed T. Ahmed、Matthew P. Thompson、Nicholas J. Weise、James L. Galman、Deepankar Gahloth、Mark S. Dunstan、David Leys、Nicholas J. Turner
DOI:10.1002/adsc.201600682
日期:2016.10.20
A practical and efficient biocatalytic synthesis of aromatic d‐amino acids has been developed, based on the reductive amination of the corresponding α‐keto acids via a recombinant whole cell system composed of an engineered dehydrogenase and cofactor recycling apparatus. The reaction was shown to give excellent enantioselectivity (≥98%) and good yields at the preparative scale across a broad range