Direct oxidative amidation of aldehydes with amines catalyzed by heteropolyanion-based ionic liquids under solvent-free conditions via a dual-catalysis process
A simple and efficient procedure for the synthesis of amides directly from aldehydes and amines catalyzed by heteropolyanion-based ionic liquids undersolvent-freeconditions has been reported. The practical protocol was found to tolerate a wide range of substrates with different functional groups. Moderate to excellent yields, solvent-free media, and operational simplicity are the main highlights
An efficient, eco-friendly and sustainable tandem oxidative amidation of alcohols with amines catalyzed by heteropolyanion-based ionic liquids via a bifunctional catalysis process
eco-friendly and sustainable method for the tandem oxidative amidation of alcohols with amines has been reported. Using heteropolyanion-based ionic liquids as the catalyst and tert-butyl hydroperoxide as the oxidant, this amidation reaction is operationally straightforward and provides a series of primary, secondary and tertiary amidesderivatives in moderate to good yields. Solvent-free media, microwave-promoted
Indazolinones, a new series of redox-active 5-lipoxygenase inhibitors with built-in selectivity and oral activity
作者:P. Bruneau、C. Delvare、M. P. Edwards、R. M. McMillan
DOI:10.1021/jm00107a023
日期:1991.3
Since the hypothetical mechanisms of hydroperoxydation of arachidonic acid by, respectively, 5-lipoxygenase (5-LPO) and cyclooxygenase (CO) involve a redox cycle, a compound which reduces 5-LPO and CO to their inactive state would give a nonselective inhibitor of both enzymes. Structural modifications of such a compound could be expected to give improved potency and selectivity for 5-LPO and oral activity. Such an approach has led to the discovery of 1,2-dihydroindazol-3-ones which are potent 5-LPO inhibitors with various degrees of selectivity. Structure-activity relationship studies indicated that while N-1,N-2-unsubstituted and N-1-substituted derivatives are orally inactive, N-2-alkyl derivatives are orally active and inhibit both 5-LPO and CO. In contrast, N-2-benzyl derivatives are selective for 5-LPO but possess only weak oral activity. Further structural modifications have identified ICI 207968 [1,2-dihydro-2-(3-pyridylmethyl)-3H-indazol-3-one, 21a] which combines potent oral activity and high selectivity. Methemoglobin (MHb) induction by 21a in dog blood precluded its development for clinical use. Attempts at dissociating 5-LPO inhibitory properties and MHb formation showed that MHb formation in vitro seemed to be related to the redox potential of the compounds whereas 5-LPO inhibition was not. This study led to a series of 4-(N-n-pentylcarbamoyl)indazolinones which maintained in vitro 5-LPO potency but did not induce MHb.
A B<sub>2</sub>(OH)<sub>4</sub>-Mediated Synthesis of 2-Substituted Indazolone and Its Application in a DNA-Encoded Library
作者:Yapeng Bao、Zongfa Deng、Jing Feng、Weiwei Zhu、Jin Li、Jinqiao Wan、Guansai Liu
DOI:10.1021/acs.orglett.0c02032
日期:2020.8.21
Indazolone cores are among the most common structural components in medicinal chemistry and can be found in many biologically active molecules. In this report, a mild and efficient approach to 2-substituted indazolones via B-2(OH)(4)-mediated reductive N-N bond formation is developed. This strategy features mild conditions, no request for a metal catalyst, and a wide scope for both aliphatic and aromatic amines. Meanwhile, this method was further successfully applied on DNA to construct indazolone cores for a DNA-encoded library. This will enable the production of a very attractive indazolone-cored library from simple amines and scaffolds, which will provide considerable diversity.
The synthesis of N-phenoxyethyl-1-substituted-1,2,3,4-tetrahydroisoquinolines and their α1-adrenoceptor blocking activity
作者:Chen-Yuan Kuo、Ming-Jung Wu
DOI:10.1016/j.ejmech.2008.09.001
日期:2009.3
A series of phenoxyisoquinolines, N-phenoxyethyl-1-(2-nitrophenyl)-1,2,3,4-THIQS 3a-3d, N-phenoxyethyl-1-benzyl-1,2,3,4-THIQ 3e, N-phenoxyethyl-1-(2-aminophenyl)-1,2,3,4-THIQs 5f'-5i', N-phenoxyethyl-1-(2- phenoxyethylaminophenyl)-1,2,3,4-THIQs 5f'-5i', have been synthesized and tested in isolated rat vas deferens alpha-adrenoreceptors. Comparison of pA2 values for these compounds in the presence of phenylephrine confirms that alpha(1)-adrenoceptor blocking activity of 3a-3d (-NO2 series) is more active than 6a-6c (-NH2 series) in the aortic rings isolated from SD rats. On the other hand, the electron-donating group at the 6-position of isoquinoline ring either increases or decreases the alpha(1)-adrenoceptor blocking activity. (C) 2008 Elsevier Masson SAS. All rights reserved.