Hydantoin bioisosteres. In vivo active spiro hydroxy acetic acid aldose reductase inhibitors
作者:Christopher A. Lipinski、Charles E. Aldinger、Thomas A. Beyer、Jon Bordner、Douglas F. Burdi、Donald L. Bussolotti、Philip B. Inskeep、Todd W. Siegel
DOI:10.1021/jm00090a004
日期:1992.6
The hypothesis that clinical side effects of the aldosereductaseinhibitor (ARI) sorbinil were related to its hydantoin ring led to a bioisosteric analysis and replacement of the hydantoin by a spiro hydroxy acetic acid moiety as in 40. These hydroxy acids, compared to hydantoins, showed a similar potency increase on chroman 2-methyl substitution, a similar orthogonal relationship of acidic to aromatic
15-Cl2-DHTP–boron complex catalyst for the asymmetric Diels–Alder cycloaddition of 2′-hydroxychalcones and dienes was developed and tested. The resulting cyclohexenes with three chiral centers were obtained in high yields (up to 98%) with excellent stereoselectivities (up to >20:1 endo/exo, >99% ee). This catalytic system features high efficiency, broad substrate scopes, and mild reaction conditions. In
(小号)-2,15-CL 2 -DHTP -硼为2'-hydroxychalcones和二烯不对称狄尔斯-阿尔德环加成配合物催化剂进行开发和测试。得到的具有三个手性中心的环己烯以高收率(高达98%)和优异的立体选择性(高达> 20:1 end / exo,> 99%ee)获得。该催化系统具有高效,广泛的底物范围和温和的反应条件的特点。另外,进行了DFT研究以解释不对称诱导的立体化学过程。
Ionic liquid mediated Cu-catalyzed cascade oxa-Michael-oxidation: efficient synthesis of flavones under mild reaction conditions
作者:Zhiyun Du、Huifen Ng、Kun Zhang、Huaqiang Zeng、Jian Wang
DOI:10.1039/c1ob06209c
日期:——
Flavonoids are a class of natural products, found in a wide range of vascular plants and dietary components. Their low toxicity and extensive biological activities, including anti-cancer and anti-bacterial, have made them attractive candidates to serve as therapeutic agents for many diseases. Herein, we disclose a highly efficient synthetic method of CuI-catalyzed cascade oxa-Michael-oxidation, using chalcones as substrates, mediated by the ionic liquid [bmim][NTf2] at a low temperature. This efficient synthetic method has demonstrated high synthetic utility and can afford flavones in good to high yields (up to 98%).
Catalytic Enantioselective Synthesis of 2-Aryl Chromenes and Related Phosphoramidite Ligands and Catalyst Compounds
申请人:Northwestern University
公开号:US20150315168A1
公开(公告)日:2015-11-05
Methods to access 2-aryl chromene compounds via an asymmetric catalytic process.
通过不对称催化过程访问2-芳基色素化合物的方法。
Kinetic Resolution and Dynamic Kinetic Resolution of Chromene by Rhodium‐Catalyzed Asymmetric Hydroarylation
作者:Qingjing Yang、Yanbo Wang、Shihui Luo、Jun (Joelle) Wang
DOI:10.1002/anie.201900721
日期:2019.4.8
A highly efficient kineticresolution and dynamickineticresolution of chromene is reported for the first time and they procced by a rhodium‐catalyzed asymmetric hydroarylation pathway. This new approach offers versatile access to various chiral 2,3‐diaryl‐chromanes containing vicinal stereogenic centers, as well as the recovered chiral flavenes, in high yields with excellent ee values (s factor up