Introduction
C19H22N2O3 is a molecular formula that corresponds to a class of organic compounds containing nineteen carbon atoms, twenty‑two hydrogen atoms, two nitrogen atoms, and three oxygen atoms. The formula is not unique to a single structure; it allows for numerous isomeric possibilities, including both heterocyclic and acyclic arrangements. Compounds that match this formula are typically found in the fields of medicinal chemistry, agrochemicals, and materials science. Their structural diversity leads to a range of physicochemical properties, ranging from moderate lipophilicity to moderate polarity, and influences their biological activity, synthetic accessibility, and regulatory status.
General Structural Features
Heterocyclic Core Possibilities
The presence of two nitrogen atoms and three oxygen atoms suggests that at least one heteroatom is incorporated into a ring system. Common cores that fit the formula include piperazinyl derivatives, indazole analogues, and triazolopyridine frameworks. For example, a piperazine ring fused to a benzene ring with an acyl side chain can account for the entire formula. In other isomers, a lactam ring can provide both nitrogen and carbonyl functionalities, while an additional ether oxygen introduces a flexible side chain.
Acyl and Ether Substituents
Three oxygen atoms may be distributed as two carbonyl groups and one ether linkage or as a single carbonyl and two ether oxygens. Acylation of a primary amine typically introduces a carbonyl oxygen, whereas alkoxy or aryl ether groups add another oxygen atom without affecting the nitrogen count. The choice of substituents dramatically affects the overall molecular shape and electronic distribution.
Physical and Chemical Properties
Molecular Weight and Formula Mass
The calculated molecular mass for C19H22N2O3 is 344.38 g mol⁻¹. The exact mass, accounting for the most abundant isotopes, is 344.1599 u. These values are consistent with moderate-sized organic molecules that can be handled using standard laboratory equipment without special containment.
Solubility and Polarity
Because the formula incorporates two nitrogen atoms capable of hydrogen bonding and three oxygen atoms, many C19H22N2O3 compounds exhibit moderate solubility in polar organic solvents such as methanol, ethanol, and dimethyl sulfoxide. Water solubility varies depending on the presence of ionizable groups; tertiary amines tend to protonate in aqueous environments, enhancing solubility at acidic pH. In nonpolar solvents like hexane, solubility is generally low due to the polar functional groups.
LogP and Partition Coefficient
Computational predictions for logP values of molecules with this formula generally fall in the range of 1.5 to 3.5. The presence of heteroatoms increases polarity, whereas aromatic or aliphatic carbons contribute to hydrophobicity. Consequently, these compounds can traverse biological membranes with moderate efficiency, a feature relevant for pharmacokinetic considerations.
Synthetic Routes
General Strategy
Synthesis of C19H22N2O3 compounds typically begins with a heteroaromatic building block or a piperazine scaffold. The strategy involves forming the heterocyclic core, followed by introduction of acyl or alkoxy side chains, and final functional group transformations to match the target formula. Key steps often include nucleophilic substitution, acylation, reductive amination, and oxidation.
Step‑by‑Step Example
Start with 4‑chloro‑2‑methylpiperidine. Conduct a nucleophilic substitution with an amine such as piperazine to form a bis‑alkylated product.
Acylate the secondary amine using a carboxylic acid chloride, e.g., 2‑phenylacetyl chloride, to introduce the carbonyl group.
Introduce an ether side chain by reacting the resulting amide with an alkyl bromide under basic conditions to form an O‑alkylated side chain.
Perform oxidation of any secondary alcohol groups to ketones using oxidizing agents such as Dess–Martin periodinane.
Finally, quench the reaction mixture, extract, and purify the product by chromatography. The purified compound should match the target formula C19H22N2O3.
Alternative Routes
- Use a Suzuki–Miyaura coupling to attach a phenyl group to a heteroaryl halide, followed by amide formation.
- Employ a reductive amination strategy, reacting an aldehyde with a primary amine in the presence of a reducing agent like sodium triacetoxyborohydride.
- Leverage a Mitsunobu reaction to invert the stereochemistry of an alcohol and install an ether functionality.
Biological Activity and Pharmacology
Pharmacophore Motifs
Compounds with the C19H22N2O3 formula often contain pharmacophore elements such as piperazine rings, which are common in drugs acting on serotonergic, dopaminergic, and adrenergic receptors. The presence of an amide or lactam moiety may contribute to hydrogen‑bonding interactions with target proteins. Additionally, the aromatic side chain can engage in π–π stacking or hydrophobic interactions within the receptor binding pocket.
Therapeutic Applications
In the literature, several C19H22N2O3 analogues have been reported as selective inhibitors of monoamine oxidase B, as well as as agents with potential antidepressant activity. Certain derivatives act as dopamine reuptake inhibitors, demonstrating activity in pre‑clinical models of Parkinson's disease. A subset of these compounds has also been evaluated for antipsychotic properties, targeting the dopamine D2 receptor with high affinity.
Agrochemical Potential
Some heterocyclic compounds matching this formula have been studied as fungicides and insecticides. Their mode of action often involves inhibition of essential enzymes in pathogenic fungi, such as cytochrome P450 monooxygenases, or interference with neurotransmission in insect pests. The moderate lipophilicity of these molecules allows for effective penetration through plant cuticles, enhancing their bioavailability in crop protection.
Natural Occurrence
Alkaloid Precursors
Although no widely known natural product bears exactly the C19H22N2O3 formula, several natural alkaloid families contain core structures that can be chemically transformed into this formula. For instance, the indole alkaloid framework can be modified via acylation and etherification to yield a C19H22N2O3 analogue. Likewise, piperidine-derived alkaloids present in plant species may undergo synthetic derivatization to reach the target formula.
Biotransformation Pathways
Microbial biotransformation of piperazine‑containing natural products often leads to oxidative products with additional oxygen atoms. Certain bacterial strains are capable of oxidizing secondary amines to lactams or introducing hydroxyl groups, thereby generating compounds that satisfy the C19H22N2O3 formula. These biotransformation studies are useful for generating diverse analogues with improved pharmacological profiles.
Analytical Characterization
Spectroscopic Techniques
High‑resolution mass spectrometry (HRMS) confirms the molecular weight and elemental composition. Nuclear magnetic resonance (NMR) spectroscopy, both ^1H and ^13C, provides detailed structural information, including the environment of the nitrogen atoms and the pattern of oxygen substituents. Infrared (IR) spectroscopy reveals characteristic absorptions for carbonyl (≈1700 cm⁻¹), amide (≈1650 cm⁻¹), and ether (≈1100 cm⁻¹) functional groups.
Chromatographic Methods
Thin‑layer chromatography (TLC) is a rapid screening tool for purity, using a solvent system such as chloroform‑methanol (9:1). High‑performance liquid chromatography (HPLC) with a reverse‑phase C18 column and a gradient of water and acetonitrile is commonly employed for quantitative analysis. Gas chromatography (GC) is applicable after derivatization to increase volatility, for instance by forming a tert‑butyl oxime derivative.
Elemental Analysis
Elemental analysis yields carbon, hydrogen, nitrogen, and oxygen percentages that corroborate the proposed molecular formula. Deviations from the expected values indicate the presence of impurities or incomplete reactions.
Safety, Handling, and Toxicology
General Hazards
Compounds with the C19H22N2O3 formula are typically classified as hazardous materials requiring standard laboratory safety precautions. They are generally considered irritants to the skin and eyes and may pose a risk of respiratory irritation upon inhalation of dust or vapors. Precautions include wearing gloves, eye protection, and working within a fume hood.
Environmental Impact
Due to the moderate lipophilicity, these molecules may accumulate in aquatic organisms if released into water bodies. Degradation pathways involve hydrolysis of amide bonds and oxidation of ether groups, producing more polar metabolites that are more readily excreted.
Regulatory Status
In pharmaceutical contexts, derivatives of this formula must undergo comprehensive toxicological testing, including acute oral toxicity, dermal absorption studies, and sub‑chronic exposure assessments. Agrochemical derivatives are regulated under national pesticide legislation, requiring registration and evaluation of field‑scale environmental exposure.
Future Directions
Drug‑Discovery Initiatives
Structure‑based drug design is actively pursued to optimize binding affinity and selectivity of C19H22N2O3 analogues for neuroreceptor targets. Fragment‑based screening coupled with medicinal chemistry iteration is expected to yield next‑generation therapeutics with improved efficacy and reduced side effects.
Green Chemistry Approaches
Development of aqueous or solvent‑free synthetic protocols for C19H22N2O3 compounds aims to reduce environmental footprints. Catalytic methods using organocatalysts or metal‑free reagents can minimize waste and improve overall atom economy.
Material Science Applications
Some heterocyclic compounds with this formula serve as monomers for polymerizable networks. Their incorporation into polymer matrices can impart flame‑retardant properties, as the amide and ether functionalities facilitate cross‑linking during polymerization. Research into these materials focuses on achieving high thermal stability and low flammability while maintaining mechanical robustness.
Conclusion
The chemical entity represented by the C19H22N2O3 formula encapsulates a versatile platform for the synthesis of diverse heterocyclic and acyclic molecules. Its moderate size and balanced polarity enable a wide range of applications, from therapeutic agents to agrochemicals and functional materials. Future research continues to refine synthetic methods, expand biological testing, and assess environmental safety, ensuring that compounds with this formula remain at the forefront of applied organic chemistry.
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