作者:Henry N. C. Wong、Zun Le Xu、Hson Mou Chang、Chi Ming Lee
DOI:10.1055/s-1992-26228
日期:——
The synthesis of racemic forms of the reportedly active principle of Danshen, namely (±)-ß-(3,4-dihydroxyphenyl)lactic acid [(±)- 3-(3,4-dihydroxyphenyl)-2-hydroxypropanoic acid] and its seven racemic derivatives is reported.
Concise Modular Synthesis of Thalassotalic Acids A–C
作者:Joseph M. Schulz、Hunter T. Lanovoi、Amanda M. Ames、Phillip C. McKegg、James D. Patrone
DOI:10.1021/acs.jnatprod.9b00028
日期:2019.4.26
thalassotalic acids A-C were isolated from a marine bacterium by Deering et al. in 2016. These molecules were shown to have tyrosinase inhibition activity and thus are an attractive set of molecules for further study and optimization. To this end, a concise and modular synthesis has been devised and executed to produce thalassotalic acids A-C and two unnatural analogues. This synthesis has confirmed
Synthesis and Application of (3<i>R</i>,4<i>R</i>)-3,4-Bis(diphenylphosphino)tetrahydrofuran as Ligand for Asymmetric Hydrogenation of Acrylic Acids
作者:Andreas Terfort
DOI:10.1055/s-1992-26275
日期:——
A new, chiral bisphosphine, (3R,4R)-3, 4-bis(diphenylphosphino)tetrahydrofuran (4), is synthesized in three steps from (R,R)-tartaric acid esters. With rhodium(I) complexes of 4enantiomeric excesses of 54 to 97% are obtained on catalytic hydrogenation of 2-(acetylamino)acrylic acid, 2-(acetylamino)cinnamic acids and itaconic acid. The applied substrate/catalyst ratios were between 250: 1 and 11000:1.
Efficient Asymmetric Hydrogenations of (<i>Z</i>)-2-Acetamidoacrylic Acid Derivatives with the Cationic Rhodium Complex of (2<i>S</i>,4<i>S</i>)-MOD-BPPM
作者:Hisashi Takahashi、Kazuo Achiwa
DOI:10.1246/cl.1989.305
日期:1989.2
5′-dimethylphenyl)]phosphino]-2-[[[bis(4′-methoxy-3′,5′-dimethylphenyl)]phosphino]methyl]pyrrolidine) and its application to highly effective asymmetric hydrogenations of (Z)-2-acetamidoacrylic acid derivatives are described.
Transition-metal-catalyzed asymmetric organic synthesis via polymer-attached optically active phosphine ligands. 5. Preparation of amino acids in high optical yield via catalytic hydrogenation
作者:Gregory L. Baker、Scott J. Fritschel、John R. Stille、John K. Stille