N-Aminations of Benzylamines and Alicyclic Amines with Nitrosoarenes to Hydrazones and Hydrazides
作者:Anisha Purkait、Chandan K. Jana
DOI:10.1055/s-0037-1610701
日期:2019.7
Unlike other alkylamines, benzylamines upon reaction with a nitrosoarene undergo oxidation to the corresponding imines. A direct amination of benzylamines, which was difficult to achieve due to its facile oxidation, to the corresponding hydrazones is reported. A wide variety of benzylamines and N-heterocycles were reacted with nitrosoarenes to provide structurally diverse hydrazones and hydrazides,
作者:Xilin Cui、Jason Z. Vlahakis、Ian E. Crandall、Walter A. Szarek
DOI:10.1016/j.bmc.2007.11.005
日期:2008.2.15
We have previously reported that sulfated cyclodextrins inhibit the invasion of Plasmodium merozoites by interacting with receptors present on the surface of erythrocytes. The observation that tetrazolium salts formed stable complexes with the inhibitory sulfated cyclodextrins suggested that tetrazolium salts might have anti-Plasmodium activity as well. Evaluation of commercially available tetrazolium salts indicated that some were active in the low nanomolar range and showed specificity in their inhibition of Plasmodium. Synthesis of a further 54 structures allowed us to determine that activity results from an aromatic component attached to the tetrazolium carbon atom (R-1) and its size is not critical to the activity of the compound. Nitro modi. cations of active compounds are poorly tolerated, however, the presence of halogen atoms on aromatic groups attached to the nitrogen atoms of the tetrazolium ring (R-2 and R-3) has little effect on activity. Methoxy groups are tolerated on R-2 and R-3 components; however, they are disruptive on the R-1 component. The overall results suggest that the R-1 component is interacting with a specific hydrophobic environment and the R-2 and R-3 components are less constrained. The activity of these compounds in several human and mouse Plasmodium cultures suggests that the compounds interact with a component of the parasite that is both essential and conserved. (c) 2007 Elsevier Ltd. All rights reserved.
Mild and Rapid Pd-Catalyzed Cross-Coupling with Hydrazine in Continuous Flow: Application to the Synthesis of Functionalized Heterocycles
作者:Andrew DeAngelis、Dong-Hui Wang、Stephen L. Buchwald
DOI:10.1002/anie.201208544
日期:2013.3.18
CN cross‐coupling of aryl chlorides with hydrazine is described. Through the use of continuousflow, the hazards associated with the use of hydrazine in the presence of transition metals are decreased. In addition, multistep flow sequences have also been developed for the generation of functionalizedheterocycles utilizing the arylhydrazine intermediates.
2,6-Diarylhexahydro-4-pyridazinols by acid-catalyzed cyclization of benzaldehyde aryl-2-(2-propenyl)hydrazones
作者:Rajagopal Bakthavatchalam、Engelbert Ciganek、Joseph C. Calabrese
DOI:10.1002/jhet.5570330137
日期:1996.1
Treatment of benzaldehyde l-(2-propenyl)-4-methylsulfonylphenylhydrazone (1f) with 45% sulfuric acid gave 2-(4-methylsulfonylphenyl)-6-phenylhexahydro-4-pyridazinol (2f) in 35% yield rather than the expected 1-(4-methylsulfonylphenyl)-1-(2-propenyl)hydrazine. The halogen-substituted hydrazones 1c-1e and benzaldehyde 1-(2-methyl-2-propenyl)phenylhydrazone (1b) gave similar results.