Chemical Identity and Structure

2-Chloro-1-[1-(4-fluorophenyl)-2,5-dimethyl-1H-pyrrol-3-yl]-1-ethanone (Aladdin SKU: C183556) is a structurally defined small molecule combining three pharmacophoric elements: (1) an electron-rich 2,5-dimethylpyrrole ring, (2) a 4-fluorophenyl substituent on the pyrrole nitrogen, and (3) a reactive chloroacetyl group at the 3-position of the pyrrole ring.

The α-haloketone motif (–COCH₂Cl) confers high electrophilicity at the methylene carbon, making this compound an efficient alkylating agent toward a wide range of soft and hard nucleophiles. The 4-fluorophenyl group on nitrogen provides metabolic stability and lipophilicity adjustments that are frequently exploited in medicinal chemistry lead optimization. The 2,5-dimethyl substitution pattern on the pyrrole ring sterically directs reactivity to the 3- and 4-positions and modulates the electronic density of the carbonyl.

The compound is a solid at room temperature and should be handled under inert atmosphere conditions when extended stability is required, given the susceptibility of α-haloketones to hydrolysis and nucleophilic substitution.

Synthetic Applications and Reactivity

The chloroacetyl group in this compound serves as a versatile electrophilic handle for the construction of diverse heterocyclic and carbocyclic architectures. Common synthetic transformations include:

• S-Alkylation: Reaction with thiol-containing nucleophiles (e.g., thiourea, mercaptoacetic acid derivatives) to produce thioether-linked adducts, which are precursors to thiazolidinone, thiazole, and related sulfur heterocycles.
• N-Alkylation: Coupling with primary or secondary amines, hydrazines, or azoles to introduce amine-containing or nitrogen-heterocycle-linked side chains.
• O-Alkylation: Reaction with phenols or alcohols under basic conditions to afford ether derivatives.
• Cyclization reactions: Intramolecular or intermolecular cyclizations using bifunctional nucleophiles enable construction of five- and six-membered rings fused or linked to the pyrrole core, expanding molecular complexity efficiently.

The 4-fluorophenyl group on the pyrrole nitrogen can additionally participate in nucleophilic aromatic substitution (SNAr) under forcing conditions, providing a further handle for diversification. These combined features position C183556 as a multifunctional building block for library synthesis and medicinal chemistry programs targeting a range of biological activities.

Handling, Safety, and Storage Guidelines

As an α-haloketone, 2-chloro-1-[1-(4-fluorophenyl)-2,5-dimethyl-1H-pyrrol-3-yl]-1-ethanone is a lachrymatory and potentially vesicant compound and must be handled with appropriate personal protective equipment (PPE):

• Personal protective equipment: Chemical-splash goggles, nitrile gloves (double-gloving recommended), lab coat, and use within a fume hood are mandatory.
• Skin and eye contact: Flush immediately with copious water for at least 15 minutes; seek medical attention. α-Haloketones are known skin and mucous membrane irritants.
• Inhalation: Move to fresh air immediately; seek medical attention if symptoms persist.
• Storage: Store in a tightly sealed container in a cool (2–8 °C recommended), dry, well-ventilated location, away from moisture, light, oxidizers, bases, and nucleophilic reagents. Desiccant use is recommended.
• Disposal: Dispose of as halogenated organic waste in accordance with local, regional, and national regulations.

Researchers should consult the Safety Data Sheet (SDS) provided by Aladdin Scientific prior to use. Given the reactive nature of the compound, small-scale test reactions are advisable before scale-up.

Quality, Purity, and Analytical Characterization

Aladdin Scientific supplies 2-Chloro-1-[1-(4-fluorophenyl)-2,5-dimethyl-1H-pyrrol-3-yl]-1-ethanone (C183556) as a research-grade reagent. Researchers requiring lot-specific purity data should request a Certificate of Analysis (CoA) at the time of order. Typical analytical techniques used to characterize this compound include:

• ¹H NMR and ¹³C NMR: Confirm regiochemistry of the pyrrole ring substitution, methyl groups, and the chloroacetyl methylene protons (expected singlet ~4.5 ppm for –CH₂Cl in CDCl₃).
• ¹⁹F NMR: Confirms presence and environment of the aryl fluoride substituent.
• HPLC purity: Reverse-phase HPLC with UV detection provides quantitative purity assessment.
• Mass spectrometry (MS): High-resolution mass spectrometry (HRMS) confirms molecular formula; characteristic isotope pattern (M and M+2 in ~3:1 ratio) confirms chlorine presence.
• Melting point: Useful as an identity check; consult the CoA for the lot-specific value.

Researchers are advised to perform identity confirmation upon receipt, particularly when the compound will be used in multi-step synthetic sequences where intermediate purity is critical.