Stereoselective Addition of Alkynes to Ketenimines: Copper/Amine Catalyzed Sulfonyl Azide–Alkyne Cycloaddition Reactions for the Synthesis of (<i>Z</i>)-1,3-Enynes
Herein, we report a copper/amine catalyzed stereoselective addition of alkynes to ketenimine intermediates generated in situ from the sulfonyl azide–alkyne cycloaddition cascade for the stereoselective synthesis of (Z)-1,3-enynes. Significantly, for the first-time, enamine intermediates generated in the copper-catalyzed sulfonyl azide–alkyne cycloaddition reactions have been successfully trapped and
在此,我们报道了一种铜/胺催化的炔烃对由磺酰叠氮化物-炔烃环加成级联原位生成的酮亚胺中间体的立体选择性加成,用于立体选择性合成 ( Z )-1,3-烯炔。值得注意的是,铜催化的磺酰叠氮化物-炔烃环加成反应中产生的烯胺中间体首次被成功捕获并分离为产物。还进行了密度泛函理论计算,发现与观察到的实验立体选择性一致。
Progresses in the pursuit of aldose reductase inhibitors: The structure-based lead optimization step
作者:Anna Ramunno、Sandro Cosconati、Stefania Sartini、Vita Maglio、Sara Angiuoli、Valeria La Pietra、Salvatore Di Maro、Mariateresa Giustiniano、Concettina La Motta、Federico Da Settimo、Luciana Marinelli、Ettore Novellino
DOI:10.1016/j.ejmech.2012.02.045
日期:2012.5
Aldose reductase (ALR2) is a crucial enzyme in the development of the major complications of diabetes mellitus. Very recently it has been demonstrated that the ARL2 inhibitor, fidarestat, significantly prevents inflammatory signals (TNF-alpha, LPS) that cause cancer (colon, breast, prostate and lung), metastasis, asthma, and other inflammatory diseases. Currently, fidarestat is in phase Ill clinical trial for diabetic neuropathy and was found to be safe. Thus the finding of novel, potent ARL2 inhibitors is today more than in the past in great demand as they can pave the way for a novel therapeutic approach for a number of diseases besides the diabetes. Herein, starting from the virtual screening-derived ALR2 inhibitor S12728 (1), a rational receptor-based lead optimization has been undertaken. The design and synthetic efforts here reported led to the discovery of several new compounds endowed with low micromolar/submicromolar activities. (C) 2012 Elsevier Masson SAS. All rights reserved.
Modulators of hERAP2 discovered by high-throughput screening
The present invention is directed towards an isomer, an enantiomer, a diastereoisomer, or a tautomer of a pyrrolidine compound represented by Formula I:
in which the substituents R
1
, R
1a
, R
2
, R
2a
, R
3
, A and Q are defined herein; or a prodrug, or a salt thereof, and which bind to IAP BIR domains. In particular, the compounds are useful in treating proliferative disorders such as cancer