4-Aminotetrahydropyran(oxolan-3-amine) is an important saturated nitrogen-containing oxygen heterocyclic compound. Its molecular structure can be regarded as a hydrogen atom on the tetrahydrofuran ring (a six-membered oxygen-containing ring) being replaced by an amino group (-NH₂). This compound possesses the stability of a cyclic ether and the reactivity of a primary amine, presenting as a colorless to pale yellow liquid, with certain alkalinity, and capable of forming salts with acids. As a key chiral synthetic building block and pharmaceutical intermediate, its unique rigid cyclic structure and the coexistence of the amino group and the oxygen ether bond make it highly significant in drug molecule design, especially in constructing complex molecular frameworks with specific biological activities, playing an irreplaceable role in the synthesis pathways of nitrogen-containing heterocyclic drugs and natural products.
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Chemical Formula |
C5H11NO |
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Exact Mass |
101 |
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Molecular Weight |
101 |
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m/z |
101 (100.0%), 102 (5.4%) |
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Elemental Analysis |
C, 59.37; H, 10.96; N, 13.85; O, 15.82 |
4-Aminotetrahydropyran is a crucial heterocyclic organic compound with a stable six-membered oxygen-containing ring structure and active amino functional groups. Its unique molecular structure endows it with good chemical reactivity, structural modifiability and biocompatibility, enabling it to play an irreplaceable role in pharmaceutical synthesis, biological research, material chemistry, agricultural production, food chemistry and other fields. The detailed expanded applications in various fields are as follows:
1. Synthetic peptide and protein drugs
Oxolan-3-amine serves as a high-value and core structural building block in the synthesis of peptide and protein drugs. The rigid and stable tetrahydropyran ring structure in its molecule can effectively optimize the spatial conformation of drug molecules, while the active amino group can participate in peptide bond condensation reactions, facilitating the efficient construction of complex peptide and protein molecular frameworks.
In modern drug design, researchers frequently introduce oxolan-3-amine structural units into drug molecules to replace traditional flexible alkyl chains or unstable heterocyclic structures, which can significantly improve the metabolic stability, oral bioavailability and target binding specificity of drugs.
Based on this characteristic, it is widely used in the synthesis of multiple categories of biomedical drugs, including targeted antibiotics, polypeptide vaccine adjuvants, recombinant growth factor regulators and neurotransmitter analog drugs.
In clinical treatment, the derived drugs cover the treatment of intractable malignant tumors, chronic neurodegenerative diseases such as Alzheimer's and Parkinson's, and systemic metabolic disorders including diabetes and lipid metabolism abnormalities. Moreover, it can also be used for the structural modification of new polypeptide anti-tumor drugs, reducing the toxic and side effects of drugs on normal human cells and improving the therapeutic index of clinical drugs.
2. Studying protein structure
In the field of structural biology and protein engineering research, oxolan-3-amine is an important artificial modification tool for protein molecules.
Through mature chemical grafting and site-specific modification technologies, researchers can precisely introduce oxolan-3-amine groups into specific amino acid sites of intracellular and extracellular proteins.
The introduction of this rigid heterocyclic structure can effectively adjust the secondary and tertiary spatial structures of proteins, change the hydrophobicity, hydrophilicity and steric hindrance characteristics of protein molecular surfaces, and further regulate the folding efficiency, stability and polymerization state of proteins.
By comparing the structural differences and activity changes between modified proteins and natural proteins, researchers can deeply explore the correlation between protein structure and biological function.At present, this modification technology has been widely applied in the dynamic research of key proteins such as enzyme proteins, receptor proteins and signal transduction proteins. It can monitor the conformational changes of proteins in real time during cell metabolism and signal transmission, reveal the kinetic mechanism of protein activation, inactivation and interaction, and provide important theoretical basis for explaining life activities and screening new drug targets.
3. Synthesis of fluorescent probes
oxolan-3-amine is an important synthetic precursor for high-performance biological fluorescent probes. Its molecular amino group can efficiently couple with fluorescent chromophores such as coumarin, fluorescein and rhodamine, and the tetrahydropyran ring can improve the water solubility and biocompatibility of probe molecules and reduce non-specific binding with biological tissues. The fluorescent probes synthesized based on oxolan-3-amine have the advantages of low biological toxicity, strong anti-interference ability and stable fluorescence signal, which are far superior to traditional simple fluorescent probes.
In biological and medical research, such probes can achieve high-sensitivity detection and quantitative analysis of small active molecules (such as reactive oxygen species, amino acids, and metal ions) and functional proteins in living cells and biological tissues. In addition, they can be used for real-time positioning tracking of target biomolecules, dynamic monitoring of protein-protein and protein-small molecule interactions, and in-depth analysis of cell proliferation, apoptosis, metabolism and other kinetic processes. They are core auxiliary tools for cell imaging, in vivo tissue tracing and subcellular structure research, and are widely used in basic biological research, pathological mechanism exploration and preclinical drug screening.
4. Synthetic pesticides and herbicides
In the field of agrochemicals, 4-Aminotetrahydropyran is a key cyclic structural unit for the synthesis of high-efficiency, low-toxicity green pesticides and herbicides. The stable oxygen-containing heterocyclic structure of oxolan-3-amine can be embedded into the molecular framework of agrochemicals, which can significantly enhance the molecular affinity of pesticides and herbicides for plant pest targets and weed physiological sites, and improve the drug efficacy and environmental stability. By modifying and derivatizing oxolan-3-amine, researchers can synthesize a variety of targeted insecticides, fungicides and selective herbicides.
Among them, fungicides derived from it can effectively inhibit the reproduction and infection of plant pathogenic fungi such as powdery mildew and rust; targeted insecticides can act on the nervous system and metabolic system of crop pests to achieve efficient pest removal; selective herbicides can accurately inhibit the growth of malignant weeds without damaging crop seedlings. This series of agrochemical products can effectively control crop diseases, insect pests and weed hazards, reduce the loss of agricultural products, and significantly improve the yield and quality of grain, vegetables and cash crops, while the low-residue characteristics of the structure also meet the development requirements of modern green ecological agriculture.
5. Synthetic polymer materials
Oxolan-3-amine is an excellent functional monomer and modification raw material for the preparation of high-performance polymer materials. Relying on the dual reactivity of amino groups and the structural stability of tetrahydropyran rings, it can participate in polymerization reactions such as polycondensation and addition polymerization, and be grafted and modified on the surface of various polymer materials to endow materials with unique functional properties. At present, it has been successfully applied to the preparation of intelligent hydrogels, functional polymer films, biomedical nanomaterials and composite polymer materials.
The polymer materials modified by oxolan-3-amine have excellent biocompatibility, mechanical flexibility, environmental responsiveness and chemical stability. In the biomedical field, the prepared hydrogels can be used as sustained-release drug carriers, tissue engineering scaffolds and wound dressing materials, which can realize the slow release of drugs and promote tissue repair; in the field of environmental science, the functionalized polymer materials can be used for adsorption and purification of heavy metal ions and organic pollutants in water bodies; in addition, the derived nanocomposite materials also have broad application prospects in biosensing and flexible wearable devices.
6. Synthetic spices and condiments
In the food and flavor industry, oxolan-3-amine is an important intermediate for the synthesis of heterocyclic flavor and fragrance compounds. It can undergo cyclization, condensation and oxidation reactions with aldehydes, ketones and sulfur-containing compounds to synthesize a variety of key flavor substances such as pyrazine, thiazole and pyran derivatives. These heterocyclic compounds have rich and unique aroma characteristics, including nutty, roasted, fruity and meaty flavors, and have strong fragrance enhancement and flavor modification effects.
The spices and condiments synthesized from oxolan-3-amine are safe, stable and not easy to volatilize, and are widely used in food processing, beverage blending, tobacco flavoring and catering seasoning. They can effectively improve the taste and aroma of baked food, snack food, functional beverages and tobacco products, cover up the peculiar smell of raw materials, and enhance the layering and durability of flavor, which is an indispensable raw material in the modern food flavor and daily fragrance industry.
7. Chemical intermediate
As a versatile fine chemical intermediate, oxolan-3-amine has extremely high application value in organic synthesis and fine chemical industry. Its active primary amino group and stable tetrahydropyran ring structure make it easy to undergo functional group conversion reactions such as alkylation, acylation and condensation, and can be derived into a variety of high-value fine chemical products.
In the pharmaceutical and chemical industry, it can be used for the synthesis of new atypical antidepressants, broad-spectrum antiviral drugs and anti-inflammatory analgesics, and the introduced tetrahydropyran structure can improve the drug's solubility and in vivo stability; in the agrochemical field, it can be further processed into high-efficiency low-residue insecticides and acaricides; in the dye industry, it can be used as a modifier for synthetic organic dyes, improving the color fastness and tinting strength of dye molecules. In addition, it can also be used in the synthesis of surfactant additives and chemical auxiliary agents, providing important raw material support for the upgrading and iteration of various fine chemical products.
The following are the detailed steps of three methods for synthesizing 4-Aminotetrahydropyran:
1. Hydroxyl protection method:
4-OH-THP + NaH → 4-H-THP + NaOH
4-H-THP + O2 → 4-COOH-THP + OH-
4-COOH-THP + NH2R → NH2THP + COOH-R
(1) Synthesis of triphenylmethyltetrahydropyranol (Tr-THP-OH):
Under anhydrous and low temperature (0 ℃) conditions, the hydroxyl group of tetrahydropyran (THP) is protected, usually using a triphenylmethyl protective group (Tr), to synthesize triphenylmethyltetrahydropyranol (Tr-THP-OH). The specific steps are: adding anhydrous triphenylchloromethane and organic bases (such as NaH, NaNH2, etc.) to tetrahydropyran, stirring at 0 ℃ for several hours to obtain triphenylmethyltetrahydropyran alcohol.
(2) Remove triphenylmethyl:
Add strong acids (such as HCl, TFA, etc.) to triphenylmethyl tetrahydropyranol for the reaction of removing triphenylmethyl to generate 4-hydroxytetrahydropyranol.
(3) Oxidizing hydroxyl and reducing carboxyl groups:
The obtained 4-hydroxytetrahydropyran is oxidized to carboxyl groups using oxidants such as KMnO4, mCPBA, etc., and then reduced to amino groups using reducing agents such as NaBH4, DIBAL, etc. to obtain 4Aminotetrahydropyran.
2. Amino protection method:
4-OH-THP + HCl → 4-Cl-THP + H2O
4-Cl THP + O2 → 4-COOH THP + Cl2
4-COOH-THP + NH2R → NH2THP + COOH-R
(1) Synthesis of Diethoxymethane Tetrahydropyranol (DEM-THP-OH):
Under anhydrous and low temperature (0 ℃) conditions, the amino group of tetrahydropyran is protected, usually using diethyloxymethane as a protective group to synthesize diethyloxymethane tetrahydropyranol (DEM-THP-OH). The specific steps are: adding anhydrous diethoxymethane and organic bases (such as NaH, NaNH2, etc.) to tetrahydropyran, stirring at 0 ℃ for several hours to obtain diethoxymethane tetrahydropyran alcohol.
(2) Removing Diethoxymethane:
Add strong acids (such as HCl, TFA, etc.) to diethyloxymethane tetrahydropyranol for the reaction of removing diethyloxymethane to generate 4-hydroxytetrahydropyranol.
(3) Oxidizing hydroxyl and reducing carboxyl groups:
The obtained 4-hydroxytetrahydropyran is oxidized to carboxyl groups using oxidants such as KMnO4, mCPBA, etc., and then reduced to amino groups using reducing agents such as NaBH4, DIBAL, etc. to obtain 4Aminotetrahydropyran.
3. Cyclic compound method:
CbzOH + H+→ CbzH + OH-
CbzH + O2 → CbzCOOH + OH-
CbzCOOH + NH2R → NH2Cbz + COOH-R
(1) Synthesis of cyclic compounds: Firstly, synthesize cyclic compounds such as cyclobutanone (Cbz) and react with 4-hydroxytetrahydropyran to obtain cyclobutanone tetrahydropyranol (Cbz THP OH). The specific steps are to react cyclobutanone with anhydrous tetrahydropyran under the action of an organic base to obtain cyclobutanone tetrahydropyran alcohol.
(2) Removing Cbz: Adding strong acids (such as HCl, TFA, etc.) to cyclobutanone tetrahydropyranol for the reaction of removing Cbz to generate 4 aminotetrahydropyranol.
(3) Deamination: The obtained 4 aminotetrahydropyran is oxidized to carboxyl groups using oxidants such as KMnO4, mCPBA, etc., and then reduced to amino groups using reducing agents such as NaBH4, DIBAL, etc. to obtain 4-Aminotetrahydropyran.
Core Applications in Modern Drug Design
Development of Anticancer Drugs
The amino group of oxolan-3-amine can participate in the formation of amide bonds, constructing peptide analogues with biological activity. For example, in the design of proteasome inhibitors, the rigid structure of the pyran ring simulates the β-panicle conformation of the peptide chain, enhancing the binding ability of the molecule to the active site of the proteasome. Preclinical studies have shown that compounds with this skeleton exhibit nanomolar inhibitory activity against multiple myeloma cell lines, and their mechanism of action involves blocking the protein degradation pathway mediated by the proteasome.
Optimization of Antimicrobial Drugs
To meet the treatment needs for drug-resistant bacteria, researchers incorporated oxolan-3-amine into the structure of β-lactam antibiotics. The ether oxygen atom of the pyran ring can simulate the natural substrate conformation of penicillin-binding protein (PBP), while the amino group enhances the affinity with the active site of PBP through hydrogen bonding. The modified antibiotic achieved a minimum inhibitory concentration (MIC) of 0.125 μg/mL against methicillin-resistant Staphylococcus aureus (MRSA), which was 8 times higher than that of traditional drugs.
Innovation in Drug Delivery Systems
The lipophilic nature of this compound makes it an ideal carrier for prodrug design. By coupling anti-tumor drugs with the carboxylic acid derivative of oxolan-3-amine, the membrane permeability of the drug can be significantly improved. For instance, the accumulation of paclitaxel-pyran ester prodrug in tumor tissues is 3.2 times higher than that of the parent drug. The mechanism involves the targeted release triggered by esterase and the enhanced cell uptake mediated by the pyran ring.
Future Prospects: From Molecular Tools to Precision Medicine
With the integration of computational chemistry and synthetic biology, the application scope of oxolan-3-amine is expanding. The virtual screening platform based on deep learning has identified the binding mode of this skeleton with the main protease of SARS-CoV-2, providing a new direction for the development of antiviral drugs. Moreover, the yeast cell factory constructed through CRISPR-Cas9 technology can achieve the biosynthesis of oxolan-3-amine from glucose, further reducing production costs and promoting personalized drug manufacturing.
From the structural units of natural sugars to the active core of anti-cancer drugs, the chemical journey of oxolan-3-amine exemplifies the chemical philosophy of "structure determines function". With the breakthroughs in interdisciplinary technologies, this molecule will continue to play a crucial role in drug innovation, providing more solutions for human health.
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