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Research Update on 5-Bromo-2,3-difluorophenylboronic Acid Pinacol Ester (CAS: 1073339-12-4) in Chemical Biology and Pharmaceutical Applications

5-Bromo-2,3-difluorophenylboronic Acid Pinacol Ester (CAS: 1073339-12-4) is a boronic acid derivative that has garnered significant attention in recent years due to its versatile applications in chemical biology and pharmaceutical research. This compound, characterized by its unique bromo- and difluoro-substituted phenyl ring and pinacol ester protection, serves as a critical building block in Suzuki-Miyaura cross-coupling reactions, a cornerstone of modern synthetic chemistry. Recent studies have further elucidated its role in drug discovery, particularly in the development of kinase inhibitors and other targeted therapies.

In the context of drug discovery, 5-Bromo-2,3-difluorophenylboronic Acid Pinacol Ester has been employed as a key intermediate in the synthesis of novel small-molecule inhibitors. A 2023 study published in the Journal of Medicinal Chemistry demonstrated its utility in the construction of BTK (Bruton's tyrosine kinase) inhibitors, which are pivotal in the treatment of B-cell malignancies. The bromo and difluoro substituents on the phenyl ring were found to enhance binding affinity and selectivity, while the boronic acid pinacol ester moiety facilitated efficient cross-coupling with heteroaryl halides.

Beyond its synthetic applications, this compound has also been explored in the development of positron emission tomography (PET) radiotracers. Researchers at the University of California, San Francisco, recently reported the use of 5-Bromo-2,3-difluorophenylboronic Acid Pinacol Ester as a precursor for the synthesis of fluorine-18 labeled probes. These probes target specific biomarkers in neurodegenerative diseases, offering potential for early diagnosis and therapeutic monitoring. The compound's stability and reactivity under mild conditions make it particularly suitable for radiochemical applications.

From a chemical biology perspective, the unique electronic properties imparted by the bromo and difluoro substituents have been leveraged in the design of activity-based probes (ABPs). A 2024 study in ACS Chemical Biology highlighted its incorporation into ABPs targeting cysteine proteases, enabling real-time monitoring of enzyme activity in live cells. The boronic acid functionality, protected as the pinacol ester, was shown to be crucial for cell permeability and subsequent intracellular esterase-mediated activation.

The safety profile and handling considerations of 5-Bromo-2,3-difluorophenylboronic Acid Pinacol Ester have also been subjects of recent investigation. While generally stable under ambient conditions, studies recommend storage under inert atmosphere to prevent gradual hydrolysis of the boronic ester. The compound's acute toxicity has been classified as moderate, with appropriate personal protective equipment recommended during handling.

Looking forward, the applications of 5-Bromo-2,3-difluorophenylboronic Acid Pinacol Ester are expected to expand further. Emerging research suggests its potential in the development of covalent inhibitors, where the boronic acid moiety can form reversible covalent bonds with target proteins. Additionally, its use in DNA-encoded library technology is being explored, which could significantly accelerate hit identification in drug discovery campaigns.

• 1073339-20-4(4,4,5,5-tetramethyl-2-(2,3,4,5-tetrafluorophenyl)-1,3,2-dioxaborolane)
• 942069-51-4(5-Bromo-2-fluorophenylboronic acid, pinacol ester)
• 303006-90-8(2-[2,5-difluoro-4-(tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane)
• 1400220-51-0(2-(3-Bromo-2-fluorophenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane)
• 942069-49-0(5-Bromo-2-fluoro-1,3-phenylenediboronic acid, pinacol ester)
• 1165935-99-8(4,4,5,5-tetramethyl-2-(2,4,5-trifluorophenyl)-1,3,2-dioxaborolane)
• 1073339-11-3(4,4,5,5-tetramethyl-2-(2,3,5,6-tetrafluorophenyl)-1,3,2-dioxaborolane)
• 1073339-17-9(2,3-Difluorophenylboronic acid pinacol ester)
• 1326316-85-1(2-(4-bromo-2-fluorophenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane)
• 325142-81-2(4,4,5,5-Tetramethyl-2-(perfluorophenyl)-1,3,2-dioxaborolane)