• 1. An insight into the hybridization mechanism of hairpin DNA physically immobilized on chemically modified graphenes
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• 2. Acentric and chiral heterometallic inorganic–organic hybrid frameworks mediated by alkali or alkaline earth ions: synthesis and NLO properties
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• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Indoles and derivatives Indoles

Recent Advances in the Study of 5-Bromo-6-chloro-1H-indole (CAS: 122531-09-3) in Chemical Biology and Pharmaceutical Research

5-Bromo-6-chloro-1H-indole (CAS: 122531-09-3) is a halogenated indole derivative that has garnered significant attention in recent years due to its versatile applications in chemical biology and pharmaceutical research. This compound serves as a key intermediate in the synthesis of various biologically active molecules, including kinase inhibitors, antimicrobial agents, and fluorescent probes. The unique electronic and steric properties imparted by the bromo and chloro substituents at the 5- and 6-positions, respectively, make this scaffold particularly valuable for structure-activity relationship (SAR) studies and drug discovery efforts.

Recent studies have explored the synthetic utility of 5-Bromo-6-chloro-1H-indole in the preparation of novel heterocyclic compounds. A 2023 publication in the Journal of Medicinal Chemistry demonstrated its use as a precursor for the synthesis of potent and selective JAK2 inhibitors, which show promise for the treatment of myeloproliferative neoplasms. The researchers employed palladium-catalyzed cross-coupling reactions to functionalize the indole core, highlighting the compound's reactivity and versatility in medicinal chemistry applications.

In the field of antimicrobial research, 5-Bromo-6-chloro-1H-indole has been investigated as a scaffold for developing new anti-tubercular agents. A recent study published in Bioorganic & Medicinal Chemistry Letters reported the synthesis of a series of indole-3-carboxamide derivatives using this compound as a starting material. Several analogs exhibited potent activity against Mycobacterium tuberculosis with minimum inhibitory concentrations (MICs) in the low micromolar range, while showing minimal cytotoxicity against mammalian cell lines.

The photophysical properties of 5-Bromo-6-chloro-1H-indole have also been explored in materials science applications. A 2024 study in ACS Applied Materials & Interfaces described its incorporation into fluorescent molecular rotors for viscosity sensing in biological systems. The halogen substituents were found to significantly influence the compound's fluorescence quantum yield and Stokes shift, making it a valuable building block for designing environment-sensitive probes.

From a pharmacological perspective, research has focused on understanding the metabolic fate of 5-Bromo-6-chloro-1H-indole derivatives. A recent investigation published in Drug Metabolism and Disposition characterized the major Phase I and Phase II metabolites of several lead compounds derived from this scaffold. The study revealed that the bromo and chloro substituents confer metabolic stability compared to their non-halogenated counterparts, potentially leading to improved pharmacokinetic profiles.

Ongoing research continues to explore new applications for 5-Bromo-6-chloro-1H-indole in chemical biology. A preprint available on ChemRxiv describes its use in the development of covalent inhibitors targeting cysteine residues in disease-relevant proteins. The electron-withdrawing effects of the halogen atoms were found to enhance the reactivity of adjacent positions toward nucleophilic attack, enabling the design of selective covalent modifiers.

In conclusion, 5-Bromo-6-chloro-1H-indole (CAS: 122531-09-3) remains a valuable scaffold in contemporary chemical and pharmaceutical research. Its unique structural features continue to inspire innovations across multiple disciplines, from drug discovery to materials science. Future research directions may include expanding its utility in targeted protein degradation strategies and as a component of novel bioimaging agents.

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