Structural Development of Benzhydrol-Type 1'-Acetoxychavicol Acetate (ACA) Analogs as Human Leukemia Cell-Growth Inhibitors Based on Quantitative Structure-Activity Relationship (QSAR) Analysis
Organocatalytic asymmetric synthesis of β,β-diaryl ketones <i>via</i> one-pot tandem dehydration/1,6-addition/decarboxylation transformation of β-keto acids and 4-hydroxybenzyl alcohols
作者:Jia-Pan Niu、Jing Nie、Shen Li、Jun-An Ma
DOI:10.1039/d0cc02213f
日期:——
Herein we describe an organocatalytic protocol for the asymmetric synthesis of β,β-diaryl ketones. Under the catalysis of a chiral phosphoric acid, 4-hydroxybenzyl alcohols underwent dehydration to form para-quinone methides, which reacted with β-ketoacids in 1,6-addition reactions. Upon treatment with Et3N in one-pot, decarboxylation proceeded to provide the desired chiral ketones in nearly quantitative
Compositions and Methods of Use of Electron Transport System Inhibitors
申请人:Kurosu Michio
公开号:US20090030084A1
公开(公告)日:2009-01-29
The invention provides compounds of the formula: or a pharmaceutically acceptable salt thereof, where m, n, R
1
, R
2
, R
3
R
4
, R
5
, R
6
, R
7
are those defined herein. The invention also provides pharmaceutical compositions comprising a compound of the invention, methods for using compounds and/or pharmaceutical compositions of the invention, and methods for synthesizing compounds of the invention.
A Cu-catalyzed asymmetric 1,6-conjugate addition of in situ generated para-quinone methides (p-QMs) with β-ketoester has been developed to construct a ketoester skeleton bearing an adjacent tertiary–quaternary carbon stereocenter in good yields and high enantioselectivities. This is the first example of metal-catalyzed asymmetric transformations of the in situ generated p-QMs, avoiding using pre-synthesized