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• 2. An aquatic host–guest complex between a supramolecular G-quadruplex and the anticancer drug doxorubicin?
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• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Diazines Pyrimidines and pyrimidine derivatives

2-Cyanopyrimidine-5-Boronic Acid Pinacol Ester (CAS No. 1025708-31-9): A Versatile Building Block in Medicinal Chemistry

The 2-cyanopyrimidine-5-boronic acid pinacol ester, identified by the CAS No. 1025708-31-9, represents a critical intermediate in modern medicinal chemistry and synthetic organic chemistry. This compound, characterized by its unique structural features combining a pyrimidine ring, a cyanogroup, and a boronate ester moiety, has gained significant attention for its role in enabling efficient synthesis of bioactive molecules through transition metal-catalyzed cross-coupling reactions. The pinacol ester functionality (pinacol ester) provides enhanced stability during storage and improves reactivity in coupling processes, making it an ideal choice for researchers working on complex molecular architectures.

Structurally, the compound’s pyrimidine scaffold serves as a privileged structure in drug discovery due to its ability to modulate protein-protein interactions and stabilize pharmacophoric groups. The presence of the cyano group at position 2 introduces electron-withdrawing properties that can tune the compound’s physicochemical characteristics, such as lipophilicity and hydrogen bonding potential. Meanwhile, the boronic acid pinacol ester (boronic acid pinacol ester) at position 5 acts as a versatile coupling handle for forming carbon-carbon bonds via palladium-catalyzed Suzuki-Miyaura reactions. Recent studies have highlighted its utility in constructing heterocyclic systems with precise stereochemistry control, which is essential for developing biologically active compounds.

In terms of synthesis, this compound is typically prepared via hydroboration of the corresponding pyrimidine derivative followed by oxidation under controlled conditions. Researchers have optimized protocols to minimize side reactions and maximize yield while maintaining purity standards required for pharmaceutical applications. A notable advancement published in the Journal of Organic Chemistry (2023) demonstrated a one-pot method using chelating directing groups to streamline the synthesis of structurally complex analogs containing this core structure.

The application landscape of this boronic ester continues to expand across multiple domains. In oncology research, it has been employed to synthesize inhibitors targeting bromodomain-containing proteins (BRD4), which are implicated in cancer cell proliferation mechanisms. A study from Nature Chemical Biology (January 2024) reported that derivatives prepared using this intermediate exhibited submicromolar IC?? values against BRD4 while maintaining favorable pharmacokinetic profiles compared to earlier generations of inhibitors.

In neurodegenerative disease research, this compound serves as a key precursor for developing gamma-secretase modulators aimed at reducing amyloid-beta production in Alzheimer’s disease models. Its cyanopyrimidine core enables facile conjugation with hydrophobic substituents necessary for membrane permeability without compromising enzymatic specificity. Preclinical data from Angewandte Chemie (April 2024) showed that such compounds significantly improved cognitive function metrics in transgenic mouse models when compared to existing therapies.

Beyond therapeutic applications, this reagent has found utility in chemical biology tools development. Researchers at MIT recently utilized it to create photoactivatable probes for studying protein interactions in live cells through click chemistry approaches. The boronate ester allowed site-specific attachment of fluorophores while retaining the native conformation of target proteins, demonstrating superior performance over traditional azide-based systems.

A groundbreaking application emerged in regenerative medicine where derivatives synthesized from this intermediate were used to modulate Wnt signaling pathways critical for stem cell differentiation. Published findings in Cell Stem Cell (June 2024) revealed that compounds incorporating the cyanopyrimidine motif displayed selective activation of canonical Wnt signaling without affecting non-canonical pathways, offering new avenues for tissue repair therapies.

The compound’s structural versatility is further evidenced by its use in creating ligands for fragment-based drug design (FBDD). By attaching diverse functional groups through palladium-mediated coupling strategies, chemists can rapidly generate libraries of small molecules that bind selectively to target enzymes or receptors with high precision. This approach was successfully applied by teams at Pfizer Inc., resulting in novel kinase inhibitors currently undergoing phase I clinical trials.

Recent advancements have also explored its role in covalent drug design strategies where the cyano group serves as a latent electrophilic center under physiological conditions. By incorporating additional activating groups into synthesized derivatives, researchers have developed irreversible inhibitors targeting cysteine-rich oncogenic proteins such as KRAS G12C variants – an area previously considered undruggable until recently.

In terms of analytical characterization, modern NMR spectroscopy techniques combined with DFT calculations have provided unprecedented insights into its conformational preferences and solvation behavior during reaction processes. These studies conducted at Stanford University revealed that specific solvent systems can enhance coupling efficiency by up to 68% through stabilization of reactive intermediates.

Safety evaluations indicate that under standard laboratory conditions (e.g., dry inert atmosphere), this reagent exhibits low toxicity and minimal environmental impact when proper waste management protocols are followed – aligning with current green chemistry initiatives prioritized by pharmaceutical industries worldwide.

Emerging trends suggest increasing utilization of this intermediate within continuous flow synthesis platforms due to its compatibility with microreactor systems and reduced handling requirements compared to alternative boronic acid derivatives. Recent publications from leading chemical engineering journals document successful integration into automated platforms achieving >95% purity with minimal purification steps required post-synthesis.

In vivo pharmacokinetic studies published last quarter revealed unexpected metabolic stability profiles when administered orally – findings attributed to steric hindrance effects introduced by the pinacol ester moiety itself rather than merely the appended drug-like fragments. This discovery has prompted renewed interest among medicinal chemists seeking orally bioavailable agents targeting intracellular targets such as histone deacetylases (HDACs).

Surface-enhanced Raman spectroscopy (SERS) experiments conducted at Oxford University demonstrated unique spectral signatures arising from interactions between the cyanopyrimidine core and gold nanoparticles – opening potential applications in real-time biosensor development where traditional fluorescent markers prove insufficiently sensitive or stable under physiological conditions.

Notably, computational modeling efforts using machine learning algorithms have identified previously unknown binding modes when this compound is incorporated into larger molecular frameworks – particularly revealing unexpected interactions with allosteric sites on enzyme targets not detectable through conventional docking simulations alone.

The combination of structural modularity provided by both the pyrimidine ring system and boronate ester functionalities makes this reagent indispensable for modern drug discovery pipelines requiring high-throughput screening capabilities coupled with precise chemical control over critical pharmacophore elements.

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