Asymmetric synthesis of 3-prenyl-substituted pyrrolidin-2-ones
摘要:
Pharmacology-relevant compounds bearing structural fragments of racetam nootropics, wound-healing acyclic isoprenoids and neurotropic GABA analogues, were enantioselectively (up to 94% ee) synthesized from available and inexpensive precursors.
Multisiteorganic–inorganichybridcatalysts have been prepared and applied in a new general, practical, and sustainable synthetic procedure toward industrially relevant GABA derivatives. The domino sequence is composed of seven chemical transformations which are performed in two one‐pot reactions. The method produces both enantiomeric forms of the product in high enantiopurity as well as the racemate
Unprecedented Hydrophobic Amplification in Noncovalent Organocatalysis “on Water”: Hydrophobic Chiral Squaramide Catalyzed Michael Addition of Malonates to Nitroalkenes
作者:Han Yong Bae、Choong Eui Song
DOI:10.1021/acscatal.5b00685
日期:2015.6.5
In this study, water was demonstrated to be an exceptionally efficient reaction medium for the noncovalent, hydrogen-bonding-promoted enantioselective Michaeladdition of malonates to diverse nitroolefins using cinchona-based squaramide catalysts. A significant increase in the reaction rate was observed when the reaction was performed “on water” rather than in the conventional organic solvents, because
Well-defined chiral Ru amido complexes promoted asymmetric Michael addition of 1,3-dicarbonylcompounds including malonates, beta-keto esters, and 1,3-diketones to nitroalkenes to give the corresponding adducts with excellent ees and in excellent yields.
明确定义的手性 Ru 酰胺配合物促进 1,3-二羰基化合物(包括丙二酸酯、β-酮酯和 1,3-二酮)与硝基烯烃的不对称迈克尔加成反应,得到相应的加合物,具有优异的 ees 和优异的产率。
Organocatalytic Asymmetric Total Synthesis of (<i>R</i>)-Rolipram and Formal Synthesis of (3<i>S</i>,4<i>R</i>)-Paroxetine
作者:Peter S. Hynes、Paul A. Stupple、Darren J. Dixon
DOI:10.1021/ol800108u
日期:2008.4.1
An efficient enantioselective total synthesis of (R)-rolipram and an efficient enantioselective formal synthesis of (3S,4R)-paroxetine has been achieved using the highly enantioselective Michael addition of malonate nucleophiles as key steps in both cases.
C<sub>2</sub>-Symmetric Chiral Squaramide, Recyclable Organocatalyst for Asymmetric Michael Reactions
作者:Alexander S. Kucherenko、Alexey A. Kostenko、Andrey N. Komogortsev、Boris V. Lichitsky、Michael Yu. Fedotov、Sergei G. Zlotin
DOI:10.1021/acs.joc.9b00252
日期:2019.4.5
organocatalyst for asymmetricMichaelreactions has been elaborated. In the presence of only 1 mol % of this catalyst, kojic acid derivatives and β-dicarbonyl compounds reacted with nitroolefins, affording the corresponding adducts in a nearly quantitative yield with an enantioselectivity up to 99% ee. The kojic acid-derived adducts could be efficiently produced under “green” conditions (in 96% EtOH or