Introduction
C14H17NO3 is a chemical formula that represents a class of organic molecules containing fourteen carbon atoms, seventeen hydrogen atoms, one nitrogen atom, and three oxygen atoms. The formula is frequently encountered in the literature when discussing small-molecule pharmaceuticals, natural products, and synthetic intermediates. Despite the simplicity of the elemental composition, compounds that share this formula can exhibit a wide range of structural motifs and functional properties, from aromatic amides to lactones and phenethylamines. This article provides an overview of the structural diversity, synthesis, physical and chemical characteristics, spectroscopic signatures, biological activities, and practical applications of compounds with the molecular formula C14H17NO3.
Molecular Formula and General Properties
Elemental Composition
The elemental ratio of C14H17NO3 corresponds to a degree of unsaturation of five. This value, derived from the formula (2C + 2 + N – H – X)/2, indicates that the molecule contains a combination of rings and multiple bonds, such as aromatic rings, double bonds, or lactone linkages. The presence of a single nitrogen atom suggests the existence of an amine, amide, or heterocyclic nitrogen, while the three oxygen atoms can be distributed among carbonyl, hydroxyl, ether, or ester functionalities.
General Structural Features
Because the formula does not uniquely define a single structure, compounds with C14H17NO3 may include:
- Phenyl‑substituted amides or ureas
- Aliphatic or aromatic lactams
- Phenethylamines with a substituted amide or ester
- Heterocyclic aromatics such as benzoxazepines or benzotriazoles
- Acylated derivatives of natural products (e.g., acetylated flavonoids)
These structural motifs influence key physicochemical parameters such as polarity, lipophilicity, and hydrogen‑bonding capacity, which in turn affect solubility, permeability, and metabolic stability.
Possible Structural Isomers
Aromatic Amides and Ureas
One common scaffold is the aromatic amide, where a phenyl ring is bonded to a carbonyl group that is further attached to a nitrogen atom bearing an additional aryl or alkyl group. For example, an N‑phenyl benzamide with a side‑chain phenyl group and a methoxy substituent can fit the formula. Urea derivatives arise when two amide linkages share a nitrogen atom, yielding a central carbonyl flanked by two aryl groups.
Lactams and Lactones
Lactams, such as γ‑lactams (five‑membered cyclic amides), often incorporate a nitrogen atom within a ring and a carbonyl group. When an additional phenyl ring is appended, the overall composition can match C14H17NO3. Lactones, on the other hand, contain a cyclic ester; incorporation of an aromatic ring or an amine substituent on the lactone ring provides another route to the target formula.
Phenethylamines with Acyl Substitutions
Phenethylamine cores, characterized by a benzene ring attached to a two‑carbon side chain ending in a primary amine, can be acylated or alkylated to yield the required elemental count. For instance, an N‑(4‑hydroxyphenyl) phenethylamide with a side‑chain acetyl group can produce the desired composition.
Heterocyclic Aromatics
Heterocycles such as benzoxazepines, benzotriazoles, or indazoles, when substituted with appropriate acyl or alkyl groups, also provide structural possibilities. The nitrogen within the ring or exocyclic to the ring often participates in hydrogen bonding or serves as a basic site for protonation.
Representative Compounds
N‑Phenylacetamide Derivatives
A family of compounds where the nitrogen of an acetamide is substituted by a phenyl ring and further functionalized with methoxy or hydroxyl groups falls under this category. These molecules are often studied for their analgesic or anti-inflammatory properties.
Phenethylamine Acetates
Acetylated phenethylamines, such as N‑(4‑hydroxyphenyl) phenethyl acetate, are encountered in the synthesis of psychoactive analogues and as intermediates in organic synthesis.
Phenyl‑Substituted Lactams
Compounds like N‑phenyl‑3‑phenyl‑2‑oxazolidinone exhibit a cyclic amide (oxazolidinone) ring fused to an aromatic system, providing both rigidity and functional versatility.
Acylated Flavonoid Analogues
Some flavonoid derivatives, after acetylation or methylation of hydroxyl groups, can conform to C14H17NO3. These molecules are explored for antioxidant activity and as scaffolds for drug design.
Synthesis Routes
Condensation of Phenylacetic Acid and Aniline Derivatives
A straightforward synthesis involves the amidation of phenylacetic acid with an appropriately substituted aniline under dehydrating conditions (e.g., using carbodiimide reagents or acid chlorides). By introducing a methoxy or hydroxy group on the aniline, the product attains the correct hydrogen count.
Acylation of Phenethylamines
Phenethylamines can be acylated using acyl chlorides or anhydrides in the presence of base (pyridine or triethylamine). Subsequent oxidation or reduction steps adjust the oxidation state of the nitrogen and the side chain to meet the C14H17NO3 formula.
Cyclization to Form Lactams
Starting from a diacid or dicarbonyl precursor, intramolecular nucleophilic attack by an amine leads to ring closure, forming a lactam. The use of Lewis acids (e.g., BF3·Et2O) or high‑temperature conditions can promote cyclization. Post‑functionalization steps introduce additional aryl substituents.
Oxidative Aromatic Substitution
Selective oxidation of a phenyl ring to introduce a carbonyl group, followed by nucleophilic addition of a nitrogenous reagent, yields amide or lactone functionalities while preserving the overall molecular formula.
Biocatalytic Transformations
Enzymatic oxidation of alcohols or the conversion of carboxylic acids to amides via amidotransferases provides a greener synthetic route. Such biocatalysts often operate under mild conditions, reducing the formation of side products.
Physical and Chemical Properties
Melting Point and Boiling Point
Compounds with the C14H17NO3 formula generally exhibit melting points ranging from 100 °C to 200 °C, depending on the degree of crystallinity and the presence of intramolecular hydrogen bonds. Boiling points are typically above 250 °C under atmospheric pressure due to the high molecular weight and limited volatility of aromatic systems.
Solubility
Solubility in polar organic solvents such as methanol, ethanol, and acetonitrile is moderate to good, reflecting the balance between aromatic hydrophobicity and polar functional groups (amide, ester, phenol). In water, solubility is limited (often
Reactivity
Typical reactivity includes nucleophilic acyl substitution at the carbonyl carbon of amides or esters, electrophilic aromatic substitution at the phenyl ring, and oxidative cleavage of side chains under harsh conditions. The nitrogen atom can act as a base or a nucleophile depending on its substitution pattern.
Thermal Stability
Thermogravimetric analysis (TGA) indicates decomposition temperatures above 300 °C for most derivatives, attributable to the robust aromatic framework and the strength of amide bonds.
Spectroscopic Characterization
Nuclear Magnetic Resonance (NMR)
1H NMR: Aromatic proton signals appear in the 7.0–8.5 ppm range, often as multiplets due to ortho‑coupling. Aliphatic methylene protons adjacent to nitrogen or oxygen resonate between 2.5–4.0 ppm. A characteristic amide proton (if present) may appear as a broad singlet around 7.5–8.0 ppm.
13C NMR: Carbonyl carbons of amides or esters appear between 165–175 ppm. Aromatic carbons resonate between 110–140 ppm, while aliphatic carbons show up between 20–60 ppm.
Infrared (IR) Spectroscopy
Key absorptions include: a strong carbonyl stretch at 1680–1720 cm−1 (amide or ester), an amide N–H stretch near 3300 cm−1 (if free N–H), and a phenolic O–H stretch around 3200–3600 cm−1 (if present). Aromatic C–H stretches appear in the 3050–3100 cm−1 region.
Mass Spectrometry (MS)
The molecular ion [M+H]⁺ is observed at m/z = 231, confirming the molecular weight of 230 g mol−1. Fragmentation typically involves loss of neutral molecules such as CO (28 amu), H2O (18 amu), or NCO (42 amu), providing diagnostic patterns for amide or lactone cleavage.
UV–Visible Spectroscopy
Aromatic systems give rise to absorption bands around 200–300 nm. Substituted phenyl rings with electron‑donating groups can show minor shifts to longer wavelengths (λmax ≈ 260–280 nm), while conjugated lactams may display additional absorption near 330–350 nm.
Biological Activity
Pharmacological Applications
Several C14H17NO3 derivatives serve as leads for analgesic, anti‑inflammatory, or anticancer agents. The amide or lactam core often contributes to binding affinity with target enzymes (e.g., cyclooxygenase, kinases) or receptors (e.g., serotonin or dopamine receptors).
Metabolic Pathways
In vivo metabolism typically involves N‑dealkylation, amidase hydrolysis, or oxidative demethylation of methoxy groups. Phase II conjugation (glucuronidation or sulfation) of phenolic hydroxyls increases hydrophilicity, promoting renal excretion.
Toxicological Considerations
Safety profiles are largely dependent on substituents. Free amine groups may cause irritation or local toxicity, while potent psychoactive analogues require careful handling due to CNS effects. Standard toxicology assays (LD50, skin sensitization) are conducted to evaluate risk.
Applications in Research and Industry
Drug Discovery
The combination of aromaticity and polar functionality makes C14H17NO3 derivatives attractive as drug scaffolds. Medicinal chemists use them in fragment‑based drug discovery, exploring structure‑activity relationships (SAR) to optimize potency and pharmacokinetics.
Materials Science
Some derivatives serve as monomers for polymerization, yielding polyamide or poly(benzoxazole) backbones with high thermal resistance and mechanical strength. Their aromatic content also grants optical clarity to certain polymer blends.
Organic Synthesis
These molecules act as protecting group carriers, coupling agents, or intermediates in cross‑coupling reactions (Suzuki, Buchwald–Hartwig) that build complex architectures.
Conclusion
The chemical species described by the formula C14H17NO3 represent a diverse set of isomers with aromatic, amide, ester, lactam, or lactone backbones. Their synthesis can be achieved through conventional chemical condensation, cyclization, or enzymatic methods, each tailoring functional groups to meet the elemental requirements. Physicochemical and spectroscopic properties align with the balance of hydrophobic aromatic rings and polar functional moieties, making these compounds valuable in pharmaceuticals, materials, and synthetic chemistry. Continued exploration of their structure–activity relationships will likely yield new therapeutic agents and functional materials.
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