4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE
4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE is a synthetic compound used as a flavoring agent or adjuvant in flavor formulations. It has been evaluated by flavor industry expert panels and appears in flavoring inventories, but specific numeric regulatory limits and approvals by major food safety authorities are limited or unclear.
What It Is
4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE is a heterocyclic organic compound composed of a thieno[2,3-d]pyrimidinone core substituted with amino and methyl groups. The structure includes a fused thiophene and pyrimidine ring system that imparts specific chemical properties relevant for sensory perception. This compound falls within the class of synthetic flavoring agents or adjuvants, meaning it is added to food formulations to modify or enhance flavor profiles. The CAS registry number 121746-18-7 uniquely identifies this compound in chemical databases and regulatory inventories, allowing for consistent reference across scientific literature and safety evaluations. Various synonyms, including alternative systematic names, reflect the same basic chemical structure and are used in research and industrial contexts. By definition, flavoring agents are substances that contribute to taste or aroma in foods without providing nutritional value, and adjuvants can assist in the dispersion or stability of flavor components in complex mixtures. The compound is not widely found in nature and is primarily known through synthetic production. Its designation as a flavor modifier means it may be used in conjunction with other ingredients to fine-tune sensory qualities such as sweetness, savory nuances, or aroma characteristics. In industry practice, flavoring agents often form part of complex blends optimized for specific food and beverage applications. The presence of nitrogen, sulfur, and aromatic rings in the molecule suggests potential interactions with sensory receptors that contribute to perceived taste or flavor enhancement, although detailed sensory descriptors vary depending on formulation and use level. Understanding the basic identity and chemical context of this compound is essential for formulators, regulatory personnel, and quality professionals working with flavor systems.
How It Is Made
The synthesis of 4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE involves organic chemical reactions that assemble the fused thieno[2,3-d]pyrimidinone ring system with appropriate substituents such as the amino group and methyl groups. Although proprietary methods vary by manufacturer, the general approach begins with precursors that provide the thiophene and pyrimidine components, which are condensed under controlled conditions to yield the bicyclic core. Subsequent functional group manipulations introduce or adjust substituents to achieve the desired chemical identity and purity. Industrial production typically uses multi-step synthesis with careful control of reaction conditions, purification processes such as crystallization or chromatography, and analytical characterization to ensure consistency. The resulting material is most often isolated, dried, and milled to a fine powder suitable for formulation use. Quality and purity specifications are essential for flavor ingredients because impurities can influence sensory properties or regulatory compliance. Producers of synthetic flavoring agents adhere to internal quality standards that define acceptable levels of residual solvents, unreacted intermediates, and byproducts. Analytical methods such as nuclear magnetic resonance (NMR), mass spectrometry, and high-performance liquid chromatography (HPLC) are commonly employed to verify structure and purity. Manufacturers often supply material with a certificate of analysis that documents these parameters. While production details are generally proprietary and not public domain, the general principles of synthetic organic chemistry and quality control apply across suppliers. Understanding the manufacturing context helps end users assess consistency and compatibility with food-grade formulation requirements.
Why It Is Used In Food
Flavoring agents like 4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE are incorporated into food and beverage products to enhance or modify sensory characteristics. Modern food products often rely on complex flavor systems that combine multiple compounds to achieve desired taste profiles, ranging from sweet to savory or fruity nuances. Synthetic flavor modifiers can provide specific notes at low use levels that complement natural ingredients or mask undesirable off-notes introduced during processing, such as heat treatment or storage. These compounds are particularly useful when natural sources cannot reliably deliver identical sensory effects due to seasonal variability or supply constraints. Because flavor perception is subjective and influenced by interactions with other ingredients, formulators select compounds based on testing and sensory evaluation panels. In addition to sensory enhancement, flavoring agents can contribute to product consistency across batches and geographic markets. Many processed foods, beverages, confectionery items, and snack products use flavor blends to maintain consumer expectations. A compound with recognized performance in specific applications may be preferred for its ability to provide a repeatable flavor impression when combined with carriers, solvents, or other additives. The term "adjuvant" reflects the role of some compounds in supporting the function of primary flavor components, for instance by influencing volatility, solubility, or stability. The use of synthetic flavoring agents is governed by regulatory frameworks that define acceptable ingredients and use levels, aiming to ensure safety while allowing innovation in product development.
Adi Example Calculation
Because no explicit numeric ADI has been published for 4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE by major regulatory bodies, an illustrative calculation cannot be derived with confidence. The absence of a published numeric ADI means that we lack a definitive baseline from which to calculate daily intake allowances for individuals of specific body weights. In general, an ADI-based calculation would multiply an established ADI (mg per kilogram body weight) by an example body weight to estimate a lifetime daily intake that remains within safety margins. For example, a hypothetical ADI of X mg/kg for a hypothetical body weight of 70 kg would yield a daily intake of 70*X mg per day. However, without a verified numeric ADI from authoritative sources, such a calculation would be speculative rather than grounded in documented regulatory guidance. This situation highlights the importance of regulatory clarity when communicating safety thresholds. Manufacturers and regulators prefer to rely on documented ADIs or expert panel conclusions when making decisions about use levels. When numeric values are not established publicly, reliance shifts to expert evaluations of typical use and exposure patterns, and safety margins are inferred based on comprehensive review of available data. Illustrative exercise involving ADI calculations emphasizes the principle rather than providing specific actionable numbers for this compound.
Safety And Health Research
Safety evaluation of flavoring agents involves a multi-tiered assessment of toxicological endpoints including acute toxicity, genotoxicity, subchronic and chronic exposure studies, and reproductive and developmental toxicology. Expert panels and committees like FEMA and JECFA review available data from animal studies, in vitro assays, and exposure estimates to determine whether a compound can be considered safe at typical use levels. For 4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE, detailed peer-reviewed safety studies in the public domain are limited, and much of the evaluation basis comes from aggregated expert assessments rather than large databases of individual studies. Safety assessments typically consider the chemical structure, metabolic pathways, potential for bioaccumulation, and comparison to structurally similar compounds. When data gaps exist, expert panels may use threshold of toxicological concern approaches or structure-activity relationship models to infer safety. Research on flavoring agents also considers exposure estimates from typical use patterns. Because flavoring agents are used at relatively low concentrations compared to macronutrients, estimated daily intakes are often orders of magnitude lower than doses associated with adverse effects in toxicological studies. These exposure assessments inform expert conclusions that certain compounds do not pose significant health risks under intended conditions of use. Regulators and expert panels explicitly document the data reviewed and any uncertainties. In the case of this compound, the lack of extensive publicly accessible study details means that safety characterizations rely heavily on expert judgment documented through programs like FEMA GRAS and JECFA specifications, which include confidential industry data or proprietary studies submitted for review. This context emphasizes the importance of ongoing research and transparent reporting to support regulatory confidence and consumer safety assurance.
Regulatory Status Worldwide
The regulatory landscape for flavoring agents varies by region and authority. In the United States, 4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE and its hydrochloride form appear in the FDA Substances Added to Food inventory (formerly EAFUS), indicating that it has been recognized in inventories used by industry for flavoring substances; however, this listing does not equate to a direct FDA approval under specific Code of Federal Regulations sections. The FDA inventory provides information about substances that have been evaluated in certain contexts, such as by FEMA expert panels, but does not itself confer an "approved" status in the same manner as explicit food additive regulations codified in 21 CFR Parts 170-199, and it is unclear whether an explicit CFR section authorizes this compound. As such, the status of this compound under FDA regulation for specific use levels remains ambiguous, and more detailed regulatory analysis would be required to confirm any explicit statutory authorization or limitations specific to application. Internationally, the Flavor and Extract Manufacturers Association (FEMA) Expert Panel has evaluated this compound and assigned it FEMA GRAS Reference Number 4669, denoting that within the FEMA program it is considered generally recognized as safe for its intended use as a flavoring agent based on available data and expert judgment. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has also reviewed this compound or its hydrochloride derivative as food flavoring specifications, with JECFA Flavor Number 2117 assigned, indicating that safety and specification data were considered in expert meetings. Specific numeric acceptable daily intakes or limits have not been explicitly established in the available JECFA evaluation documents for the non-hydrochloride form, and the absence of clear numeric limits means that detailed regulatory guidance on maximum use levels is not universally harmonized. Regulatory frameworks across regions emphasize that flavoring agents must be safe when used as intended and that compliance with local rules and inventories is necessary for legally marketed food products.
Taste And Functional Properties
The sensory attributes of 4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE relate to its classification as a flavor modifier. While explicit sensory descriptors can vary among users, compounds in this class are generally evaluated for their impact on taste perception, including sweetness, savory complexity, or subtle aromatic enhancement. Sensory scientists measure functional properties such as odor threshold, flavor intensity, and interaction with other flavor compounds using trained panels and analytical techniques. Functional properties also encompass solubility behavior in various media. For example, solubility in alcohol and water affects how a flavoring agent integrates into beverage systems versus fat-rich products. The water solubility of this compound is limited but sufficient for many aqueous systems when combined with appropriate carriers or solubilizers. Solubility and stability under processing conditions such as heating, pH variation, and storage influence its suitability for different applications. Flavor compounds must also withstand manufacturing processes without significant degradation that would alter sensory characteristics. 4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE has a molecular structure that is generally stable under typical food processing conditions, though high temperatures or extreme pH can lead to breakdown or reaction with other ingredients. Sensory evaluation considers both the immediate taste and aftertaste, ensuring that the compound contributes positively without imparting off-flavors at intended use levels. Functional behavior also includes interactions with fats, emulsifiers, and other additives that may influence release and perception of flavor. The overall sensory profile and functional compatibility are key reasons formulators select specific flavor modifiers during product development.
Acceptable Daily Intake Explained
An acceptable daily intake (ADI) is a quantitative estimate of a substance that can be ingested daily over a lifetime without appreciable health risk, expressed per unit of body weight. ADIs are typically established by regulatory bodies based on toxicological data and safety factors that account for uncertainties such as interspecies differences and sensitive populations. An ADI provides a frame of reference for risk assessments and is not a recommended consumption level, but rather a boundary meant to ensure safety margins. For many flavoring agents, ADIs are either established explicitly when robust data exist or inferred through expert evaluation when data are limited. In the case of 4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE, specific numeric ADI values are not clearly published in the primary regulatory documentation available, and therefore a precise numeric ADI cannot be confidently stated. The absence of an explicitly published ADI suggests that regulatory assessments have focused on expert panel conclusions of safety at typical use levels rather than defining a formal numeric threshold. Understanding ADIs helps manufacturers and regulators assess whether estimated exposures from food products remain well below levels of toxicological concern. ADIs incorporate conservative safety factors to protect diverse populations including children and adults with varying metabolic capacities. When an ADI is not established, safety evaluations emphasize that compounds should be used at the lowest levels necessary to achieve the desired sensory effect and consistent with good manufacturing practice. It also underscores the ongoing role of scientific review and data generation to support clear regulatory guidance. Because ADIs are precautionary tools rather than indicators of benefit, they are part of comprehensive safety frameworks that include exposure assessment, toxicology, and regulatory compliance.
Comparison With Similar Additives
Flavoring agents and modifiers encompass a wide range of chemical structures, from simple esters and aldehydes to complex heterocyclic compounds like 4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE. Compared to small molecule flavor compounds such as vanillin or ethyl butyrate, which impart distinct vanilla or fruity notes respectively, heterocyclic compounds often contribute subtle or complex sensory nuances that may complement primary flavors. Structurally similar heterocyclic compounds used in flavor systems include various pyrimidinone or thiophene derivatives that modulate taste perception through interaction with sensory receptors. These compounds share functional groups that influence volatility and receptor binding, and they are selected for specific sensory goals. Another comparator is furaneol (4-hydroxy-2,5-dimethyl-3(2H)-furanone), a naturally occurring flavor compound known for sweet, caramel-like aromas. While structurally different, both furaneol and thieno-pyrimidinone derivatives serve to enhance or balance flavors in complex formulations. The choice of specific flavoring agents depends on the desired sensory profile and compatibility with other ingredients. Unlike simple molecules with well-characterized sensory descriptors, complex heterocyclic compounds may require detailed sensory panel evaluation to determine their contributions. Comparing across structural classes illustrates how diverse chemical frameworks support flavor innovation and how functional attributes like volatility, stability, and receptor interaction guide selection for specific food applications.
Common Food Applications Narrative
In commercial food and beverage formulations, flavoring agents like 4-AMINO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDIN-2(1H)-ONE are part of broader sensory strategies to deliver consistent taste experiences. These ingredients find use in a wide range of product categories where nuanced flavor profiles are critical to consumer acceptance. In confectionery products, for example, flavor modifiers help balance sweetness and enhance fruity or creamy notes, particularly in sugar-free or reduced-sugar formulations where the absence of sucrose alters flavor perception. Similarly, in beverages, flavor enhancers can contribute to crispness or complexity without adding caloric content, supporting diverse product positioning from soft drinks to flavored waters. Dairy-derived products such as ice cream, yogurt, and flavored milk benefit from targeted flavor compounds that support the natural dairy character while adding distinctive sensory elements. In savory snacks, seasonings that rely on a balance of umami, saltiness, and spice notes may include specialized flavoring agents to achieve an appealing overall profile. Bakery products use flavor modifiers to complement grain and sugar ingredients, enhancing buttery, vanilla, or caramel-like perceptions. In sauces and dressings, precise flavor adjustments help maintain consistency across production lots and ensure that consumers experience the intended taste each time they purchase a product. Although not all specific formulations disclose individual flavoring agents, the general presence of such compounds in modern processed foods is widespread and driven by sensory optimization goals.
Safety & Regulations
FDA
- Notes: The FDA Substances Added to Food inventory lists this compound, but explicit approval under specific CFR sections could not be verified.
EFSA
- Notes: No explicit EFSA numeric ADI could be verified in the available authoritative EFSA evaluation summaries.
JECFA
- Notes: JECFA specifications exist for the hydrochloride form (Flavor Number 2117) but no explicit numeric ADI is published.
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