Ethyl Malonyl Chloride CAS 36239-09-5

Ethyl malonyl chloride, also known as ethyl malonate chloride or 3-chloro-3-oxobutanoic acid ethyl ester, is an organic compound belonging to the class of esters with a specific functional group that combines the characteristics of both malonic acid derivatives and chloroalkanes. This versatile chemical compound finds applications in various fields, including organic synthesis, pharmaceutical chemistry, and as an intermediate in the production of other chemicals.

Structurally, it can be described as an ester formed between malonic acid (a dicarboxylic acid with the formula HOOC-CH2-COOH) and ethanol (an alcohol with the formula C2H5OH), with one of the carboxylic acid groups replaced by a chloro (Cl) substituent. This substitution results in the molecule having the formula ClC(O)CH2C(O)OCH2CH3.

In terms of its physical properties, it is typically a colorless to pale yellow liquid with a distinct odor. Its boiling point and melting point depend on the purity and conditions of measurement but generally fall within a specific range. Due to the presence of the chlorine atom and the ester group, the compound exhibits both halogenated and ester-like reactivity.

Ethyl malonyl chloride (CAS number 36239-09-5), chemical name malonic acid monoethyl chloride, molecular formula C ₅ H ₇ ClO3, is a highly reactive 1,3-dicarbonyl compound. Its molecular structure contains both acyl chloride groups (- COCl) and ethyl ester groups (- COOEt), giving it diverse chemical conversion abilities. As a key intermediate in the field of organic synthesis, it is widely used in pharmaceuticals, pesticides, materials science, and basic chemistry research.

Medicinal Chemistry: The Foundation for Building Complex Drug Molecules

 

It occupies a central position in drug synthesis, and its acyl chloride group can undergo nucleophilic substitution reactions with compounds such as amines, alcohols, thiols, etc., efficiently constructing amide bonds, ester bonds, or thioester bonds, introducing key functional groups into drug molecules.

1. Development of antiviral drugs
Literature reports indicate that it is a key raw material for synthesizing HIV-1 virus targeted drug molecules. By reacting with specific amine compounds, a skeletal structure with inhibitory activity against viral replication can be constructed.

 

For example, in the synthesis of non nucleoside reverse transcriptase inhibitors (NNRTIs), their acyl chloride groups can undergo condensation reactions with aromatic amines to form biologically active imidazole or pyridine ring structures. These compounds have entered the preclinical research stage.

2. Synthesis of receptor antagonists
In the field of cardiovascular disease treatment, it is used to prepare beta receptor antagonists (such as propranolol analogs). The amide intermediate generated by its reaction with secondary amines can be further modified with functional groups to obtain more selective antagonists for the treatment of diseases such as hypertension and angina.

 

3. Intermediate of anti-tumor drugs
As a raw material for synthesizing topoisomerase inhibitors (such as irinotecan analogs), ester intermediates are generated by reacting with hydroxyl compounds, and then cyclized to construct multi ring structures with DNA embedding activity. These compounds have significant inhibitory effects on solid tumors such as colon cancer and lung cancer.
4. Antibiotics and antimicrobial agents
In the synthesis of β - lactam antibiotics (such as penicillin derivatives), they can replace traditional chloroformate reagents by reacting with amino compounds to generate more stable amide bonds, improving the chemical stability and antibacterial spectrum of antibiotics.

Pesticide Chemistry: Innovative Raw Materials for Green Pesticide Synthesis

 

The application in the field of pesticides focuses on the synthesis of new environmentally friendly insecticides, herbicides, and plant growth regulators, which have high reactivity and few by-products, in line with the development trend of green chemistry.
1. New nicotine insecticides
As a key intermediate for the synthesis of third-generation neonicotinoid insecticides such as fipronil and pymetrozine, ethyl chloroformate reacts with chlorinated hydrocarbons to form chloropropanedicarboxylate, which is then cyclized to construct a neurotoxic nitroguanide structure. These compounds have efficient contact and gastric toxicity against piercing sucking mouthparts pests such as rice planthoppers and aphids.

 

2. Sulfonylurea herbicides
When synthesizing sulfonylurea herbicides such as sulfonamide and bensulfuron methyl, a sulfonylurea skeleton is formed by reacting with sulfonamide compounds. Its unique heterocyclic structure can specifically inhibit acetyl lactate synthase (ALS), block the synthesis pathway of branched chain amino acids in weeds, and achieve low-dose, highly selective weed control effects.
3. Plant growth regulator
By reacting with indole-3-acetic acid (IAA) analogues, ethyl chloroformate can synthesize ester compounds with auxin activity. These substances can regulate plant cell elongation and division, promote fruit enlargement, and increase crop yield, and are widely used in fruit tree cultivation.

Materials Science: Building Units of Functional Polymer Materials

 

Its acyl chloride group can react with the hydroxyl and amino groups at the end or side chains of the polymer chain, introducing functional groups and endowing the material with special properties.
1. Polyester material modification
In the synthesis of polyethylene terephthalate (PET), ethyl chloroformate can be used as a comonomer to introduce propylene ester segments through ester exchange reaction, thereby increasing the glass transition temperature (Tg) and thermal stability of the polymer. It is suitable for the field of high-temperature engineering plastics.

 

2. Biodegradable material
When copolymerized with polylactic acid (PLA), ester bond hydrolysis sensitive sites can be introduced to accelerate the degradation rate of the material in vivo. At the same time, the degradation cycle can be controlled by adjusting the length of the malonate ester chain segment, which is suitable for medical materials such as absorbable sutures and drug sustained-release carriers.
3. Synthesis of photosensitive materials
Its acyl chloride group can react with photochromic compounds (such as spiropyran) to generate ester derivatives with photoresponsiveness. Such materials have potential application value in fields such as smart windows and optical storage devices.

Procedure:

Starting Material: Use ethyl malonate (also known as monoethyl potassium malote) as the starting material.

Chlorination Agent: Select a chlorinating agent such as thionyl chloride (SOCl2) or oxalyl chloride (COCl2).

Reaction Conditions:

Dissolve the monoethyl potassium malote in an appropriate solvent, such as toluene or dichloromethane.

Add the chlorinating agent dropwise to the solution under controlled conditions.

Heat the reaction mixture to a moderate temperature (e.g., 110°C for thionyl chloride) and stir for several hours to ensure complete reaction.

Work-up:

After the reaction is complete, remove the solvent by distillation under reduced pressure.

The resulting product is obtained as an oil or solid, depending on the reaction conditions and purification steps.

Example Procedure:

Starting with 14.9 g (112.8 mmol) of ethyl malonate in 226 mL of toluene, add 26.6 g (225.6 mmol) of thionyl chloride.

Heat the reaction mixture to 110°C and stir for 4 hours.

Concentrate the mixture under reduced pressure to obtain ethyl malonyl chloride as a brown oil.

Alternative Approach:

This method involves converting monoethyl potassium malote to its chloride derivative, though direct examples of this specific route may not be readily available. However, the principle would involve chlorination of the carboxylic acid ester functionality.

General Steps:

Preparation of Malonic Acid Monoethyl Ester: If not readily available, synthesize monoethyl potassium malote from malonic acid or its salts.

Chlorination:

Dissolve the monoethyl potassium malote in an inert solvent.

Add a suitable chlorinating agent, such as oxalyl chloride or thionyl chloride, under controlled conditions.

Heat the reaction mixture to an appropriate temperature and stir for several hours.

Work-up and Purification:

Remove the solvent and unreacted reagents by distillation.

Further purify the product as needed.

Chloroformylacetate ethyl ester, chemically denoted as CH2(COOC2H5)2Cl, is a specialized organic compound exhibiting unique bioactivity characteristics. Its molecular structure integrates a chloride substituent with two ethyl ester groups attached to a central malonic acid derivative, imparting it with specific properties that make it intriguing for various biochemical applications.

One notable bioactivity feature lies in its potential as a precursor in the synthesis of bioactive compounds. Due to its malonyl moiety, it can undergo controlled reactions to form intermediates crucial for the preparation of pharmaceuticals, agrochemicals, and other biologically active agents. The chloride group facilitates these synthetic transformations, often serving as a point of attachment or modification.

Moreover, this compound may exhibit moderate to low toxicity profiles, although its specific toxicity levels depend on the application context and exposure conditions. Its biocompatibility, when appropriately handled and incorporated, can be leveraged in designing novel therapeutic strategies or enhancing existing ones.

In synthetic biology and biotechnology, it finds utility in the engineering of metabolic pathways, enabling researchers to introduce or augment specific biochemical reactions tailored for producing high-value compounds. Its ability to undergo diverse chemical manipulations underscores its versatility in tailoring bioactivities to meet specific research or industrial needs.

In summary, ethyl malonyl chloride, with its distinct chemical architecture, offers a versatile platform for the development of bioactive molecules, contributing to advancements in medicinal chemistry, agriculture, and beyond. However, thorough safety assessments and controlled use are paramount to harness its potential fully while mitigating potential risks.

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