Quantitative structure-activity relationships in 1-aryl-2-(alkylamino)ethanol antimalarials.
Journal of Medicinal Chemistry
|April 1, 1979
Summary
A quantitative structure-activity relationship (QSAR) model was developed for 646 antimalarials against Plasmodium berghei. Electron-withdrawing substituents significantly enhance antimalarial activity, guiding the design of more potent drugs.
Area of Science:
- Medicinal Chemistry
- Parasitology
- Computational Chemistry
Background:
- Malaria remains a significant global health challenge, necessitating the development of novel antimalarial drugs.
- Quantitative Structure-Activity Relationship (QSAR) studies are crucial for understanding drug-target interactions and optimizing lead compounds.
Purpose of the Study:
- To develop a predictive QSAR model for a series of arylcarbinol antimalarials targeting Plasmodium berghei.
- To identify key structural features that influence antimalarial activity.
Main Methods:
- Formulation of a QSAR model using 646 antimalarial compounds.
- Analysis of arylcarbinols with the general structure X-ArCHOHCH2NR1R2.
- Inclusion of 60 diverse aryl structures, including heterocycles.
Main Results:
- A 14-term QSAR equation was developed with a correlation coefficient of 0.898.
- The electron-withdrawing ability of substituents (X) was identified as the primary determinant of antimalarial activity.
- Hydrophobic characteristics of X and R groups played a lesser role in activity.
Conclusions:
- The developed QSAR model provides insights into the structural requirements for potent antimalarial activity against P. berghei.
- The findings suggest strategies for designing novel, more effective antimalarial analogues.
- The study also considered the lack of activity in approximately 100 analogues, contributing to a comprehensive understanding.
More Related Videos
Related Concept Videos
01:19Structure of Amines
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...
01:26Physical Properties of Amines
Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
01:18Basicity of Aromatic Amines
The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
01:29Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship
Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
01:16Adrenergic Agonists: Chemistry and Structure-Activity Relationship
Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...
01:28Structure-Activity Relationships and Drug Design
Drug design is a dynamic field that involves discovering and developing new medications based on specific biological targets. This process heavily relies on structure-activity relationships (SAR) and quantitative structure-activity relationships (QSAR) to guide the design and optimization of efficient drugs.
SAR studies the intricate relationship between a drug's chemical structure and biological activity. It focuses on understanding how modifications to a drug's structure can influence its...
SAR studies the intricate relationship between a drug's chemical structure and biological activity. It focuses on understanding how modifications to a drug's structure can influence its...