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5-bromoisatoic anhydride is an important organic synthetic intermediate. Its molecular structure can be regarded as the benzene ring of isocyanate (benzofuran-1,3-dione) having a bromine atom substituted at the fifth position as a derivative. This structure combines the high reactivity of the acid anhydride and the positioning effect of the bromine atom. This compound usually appears as a white to off-white crystalline powder and is relatively stable in air, but still requires protection from light and sealing for storage.
Its core value in synthetic chemistry lies in being a key module for constructing complex molecules, especially by reacting its acid anhydride functional group with amine compounds, which can efficiently and highly selectively ring-open to generate amide derivatives of the amine phenylacetic acid (aminophthalic acid) framework, providing a basis for subsequent derivatization.
At the same time, the bromine atom introduced on the benzene ring serves as an excellent directing group, providing a key site for further structural modification through transition metal-catalyzed cross-coupling reactions (such as Suzuki, Heck or Buchwald-Hartwig amination reactions), significantly expanding its application scope. Therefore, 5-bromo isocyanate is widely used in fields such as pharmaceutical chemistry and materials science, particularly in constructing quinazolinones, anthraquinones or other heterocyclic structures with specific functional substitutions, playing an indispensable role in realizing the diversity of molecular functions and being a powerful tool for achieving molecular functional diversification.
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Chemical Formula |
C8H4BrNO3 |
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Exact Mass |
241 |
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Molecular Weight |
242 |
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m/z |
241 (100.0%), 243 (97.3%), 242 (8.7%), 244 (8.4%) |
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Elemental Analysis |
C, 39.70; H, 1.67; Br, 33.01; N, 5.79; O, 19.83 |
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5-bromoisatoic anhydride, also known as 6-bromo-1,2-dihydro-4H-3,1-benzoxazine-2,4-dione, is an important organic compound with wide applications in the chemical and pharmaceutical fields.
As a chemical raw material
In addition to serving as a pharmaceutical intermediary, it is also an important chemical raw material. It can be used to synthesize a variety of fine chemical products, such as agricultural chemicals, dyes, pigments, spices, essence, etc. Here are some specific examples of chemical synthesis applications:
(1) Synthetic agricultural chemicals:
It plays an important role in the synthesis of agricultural chemicals. It can react with specific amine, alcohol, or acid compounds to generate compounds with insecticidal, bactericidal, or herbicidal activity. These agricultural chemicals are used in agricultural production to protect crops from pests and diseases, and to improve crop yield and quality.
(2) Preparation of dyes and pigments:
It can also be used to synthesize various dyes and pigments. By reacting with specific aromatic amines or phenolic compounds, dyes and pigments with bright colors and high stability can be generated. These dyes and pigments are widely used in industries such as textiles, printing, and coatings, adding color to people's lives.
(3) Synthetic fragrances and essence:
It also plays an important role in the synthesis of spices and essence. It can react with specific alcohols or aldehydes to produce compounds with specific aromas. These spices and essence are widely used in food, beverage, cosmetics and other industries to add fragrance and pleasure to people's lives.
Other applications
In addition to the main uses mentioned above, it also has some other applications, such as being used as a UV absorber, foaming agent, flame retardant, preservative, bleach, fungicide, and hygiene disinfectant. Here are some specific application examples:
(1) As a UV absorber:
It can be used as a UV absorber in polymer materials such as plastics and coatings. It can absorb ultraviolet energy and convert it into harmless heat or light energy, thereby protecting polymer materials from UV damage and aging.
(2) As a foaming agent:
In the preparation of foaming agents, it can be used as an effective chemical foaming agent. It can decompose at high temperature to produce gas, so that the polymer material expands and foams, forming a foam material with excellent performance. These foam materials are widely used in construction, packaging, thermal insulation and other industries.
(3) As a flame retardant:
It can also be used as a flame retardant in polymer materials. It can release bromide ions during combustion and react with free radicals in the flame, thereby suppressing the spread and propagation of the flame. This flame retardant is widely used in industries such as wires and cables, textiles, and plastic products to improve the fire resistance of products.
(4) As a preservative and bleach:
It also has certain application potential in the preparation of preservatives and bleaching agents. It can react with specific compounds to generate compounds with anti-corrosion or bleaching properties. These compounds are widely used in industries such as food processing, textile printing and dyeing, and water treatment to protect products from microbial contamination and oxidative deterioration.
(5) As a fungicide and hygiene disinfectant:
5-bromoindigo anhydride can also be used to prepare fungicides and disinfectants. It can achieve the goal of killing or inhibiting microbial growth by disrupting the cellular structure or metabolic processes of microorganisms. These fungicides and disinfectants are widely used in industries such as healthcare, hygiene, and food processing to ensure people's health and safety.
5-Bromoisatoic anhydride can be prepared by the following three synthetic routes:
1. Using 2-bromobenzoic acid as raw material:
Step 1:
Acylate 2-bromobenzoic acid and anhydrous acetic acid (or acetic anhydride) under the catalysis of cuprous chloride to obtain 2-bromobenzoic anhydride.
Step 2:
React 2-bromobenzoic anhydride and arsenic trioxide in tetrahydrofuran to obtain 5-bromoisophthalic anhydride.
Step 3:
Add sodium hydroxide to 5-bromoisophthalic anhydride in ethanol, then heat and hydrolyze to obtain 5-bromoisophthalic acid.
Step 4:
React 5-bromoisophthalic acid and acetic anhydride under the catalysis of ferric chloride to obtain the target product.
2. Using 5-bromoisophthalic acid as raw material
Step 1:
React 5-chloroiso-o-acid and phosphorus pentachloride in tetrahydrofuran to obtain 5-chloro-iso-o-acyl chloride.
Step 2:
React 5-chloroiso-o-acyl chloride and arsenic trioxide in tetrahydrofuran to obtain 5-chloro-iso-o-acid anhydride.
Step 3:
Add sodium hydroxide to 5-chloroiso-o-acid anhydride in ethanol, then heat and hydrolyze to obtain 5-chloro-iso-o-o-acid.
Step 4:
React 5-chloroiso-o-acid and bromine under the catalysis of cuprous chloride to obtain 5-bromo-iso-o-o-acid.
Step 5:
Add sodium hydroxide to 5-bromoisophthalic acid in ethanol, then heat and hydrolyze to obtain 5-bromoisophthalic acid.
Step 6:
React 5-bromoisophthalic acid and acetic anhydride under the catalysis of ferric chloride to obtain the target product.
5-Bromoisatoic anhydride is an important organic intermediate with broad application prospects. Its main application areas include medicinal chemistry, materials science, biochemistry, etc.
1. In the field of medicinal chemistry, it can be used as an important intermediate in drug synthesis for the synthesis of various drugs, such as anticancer drugs, antiviral drugs, and immunosuppressants. Its synthesis method has been relatively mature and can meet the needs of large-scale preparation. It is expected that with the continuous development of medical technology and people's emphasis on health, the demand for product in the pharmaceutical field will continue to grow.
2. In the field of material science, it can be used to prepare various new materials, such as polymers, coatings, catalysts, etc. Its application prospects are relatively broad, and it is expected to provide new ideas and new methods for the preparation of high-performance materials.
3. In the field of biochemistry, it can be used to study the structure and function of biological macromolecules, such as proteins and nucleic acids. It has potential application prospects in biomarkers and bioprobes.
In conclusion, 5-Bromoisatoic anhydrid has broad application prospects and plays an important role in medicinal chemistry, material science, biochemistry and other fields. Melting point: 220-223 °C, boiling point: 489.7 °C at 760 mmHg, density: 1.82 g/cm3. Warning word Danger Hazard statement H312-H315-H319-H332-H335-H360, Precautionary statement P201-P261-P280-P305+P351+P338-P308+P313-P264-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313, Hazard symbol T,Xi, Hazard Category Code 61-20/21-36/37/38. Safety Instructions 53-23-36/37/39-45
The above is the synthetic route for preparing 5-Bromoisatoic anhydride. It should be noted that in the actual production process, it is necessary to optimize the reaction conditions and improve the process to increase the yield and purity of the reaction.
The mechanism of action of 5-bromoindigo carmine anhydride in organisms may involve multiple aspects, including interactions with biomolecules, affecting signaling pathways, and regulating gene expression.
5-bromoindole-3-acetic anhydride and its derivatives may interact with biomolecules such as DNA, RNA, or proteins. This interaction may alter the structure and function of biomolecules, thereby affecting the normal physiological processes of cells. For example, they may act as DNA intercalators or DNA crosslinkers, interfering with DNA replication and transcription processes; Alternatively, it can bind to proteins to alter their conformation and activity.
5-bromoindole-3-acetic anhydride and its derivatives may exert biological activity by affecting intracellular signaling pathways. These signaling pathways include MAPK pathway, PI3K/Akt pathway, NF - κ B pathway, etc., which play important roles in cell proliferation, apoptosis, differentiation, migration, and other processes. 5-bromoindole-3-acetic anhydride and its derivatives may regulate cellular physiological processes by inhibiting or activating key molecules in these signaling pathways.
5-Bromoisatoic anhydride and its derivatives may also exert biological activity by regulating gene expression. They may act as inhibitors or agonists of transcription factors or epigenetic modifying enzymes, affecting gene expression levels. This regulatory effect may involve epigenetic mechanisms such as DNA methylation and histone modification, thereby affecting processes such as cell proliferation, differentiation, and apoptosis.
Adverse reactions
5-Bromoisatoic anhydride is an important organic synthetic intermediate widely used in the fields of medicine, pesticides, and materials science. Its chemical structure contains bromine atoms and indigo anhydride functional groups, endowing it with unique reactivity. However, with its widespread application in industrial production and laboratory research, its potential adverse reactions have gradually attracted attention. The following is a detailed description of its adverse reactions:
Human exposure cases and potential risks
Environmental exposure
Wastewater discharge may lead to water pollution, enrichment through the food chain, and increase human exposure risks.
Long term low-dose exposure may cause chronic health effects, such as liver and kidney function damage and immune system disorders.
Adverse reactions in drug development
As a drug intermediate, its residual impurities may cause adverse drug reactions. For example, a certain anti-tumor drug contains impurities such as 5-bromoindigo carmine, which leads to abnormal liver function in patients after medication.
Clinical manifestations and management of adverse reactions
Acute poisoning
Symptoms: Nausea, vomiting, abdominal pain, dizziness, difficulty breathing, and in severe cases, coma and convulsions may occur.
Treatment: Immediately remove from contact, rinse with plenty of water for skin contaminants, and rinse with physiological saline for 15 minutes for eye contact; Transfer the inhaler to a well ventilated area and administer oxygen if necessary; Oral users are prohibited from inducing vomiting and should seek medical attention immediately.
Chronic poisoning
Symptoms: fatigue, decreased appetite, weight loss, liver pain. Long term exposure may lead to cirrhosis and renal failure.
Handling: Regularly monitor liver and kidney function, blood routine, and perform liver and kidney protection treatment if necessary; Avoid further exposure.
Special population risk
Pregnant women and children: Reproductive toxicity tests suggest a risk of fetal malformation, and pregnant women should avoid contact; Children are more sensitive to chemicals and need to strengthen their protection.
Elderly people: Decreased liver and kidney function, decreased metabolic capacity, and susceptibility to accumulation poisoning.
Risk Management and Security Protection
Engineering Control
The production workshop adopts enclosed and automated equipment to reduce manual operations.Install a local exhaust system to ensure that the concentration of 5-bromoindole-3-acetic anhydride in the workplace air is below the occupational exposure limit (OEL, recommended to be set at 0.1 mg/m ³).
Personal Protection
Operators are required to wear gas masks (P100 filter box), protective clothing, and chemical resistant gloves.Eating, drinking, or smoking are prohibited in exposed areas.
Monitoring and Emergency Response
Regularly monitor the concentration of 5-bromoindole-3-acetic anhydride and its metabolites in workplace air and employee biological samples (urine, blood).Develop emergency plans, equip with eye wash stations, shower devices, and emergency medical supplies.
Waste Disposal
Waste should be classified and collected, and qualified units should be commissioned to carry out high-temperature incineration treatment to avoid secondary pollution.
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