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Research Briefing on 3-chloro-N-methylisoquinolin-1-amine (CAS: 1368050-35-4) in Chemical Biology and Pharmaceutical Applications

The compound 3-chloro-N-methylisoquinolin-1-amine (CAS: 1368050-35-4) has recently garnered significant attention in the field of chemical biology and pharmaceutical research due to its potential therapeutic applications. This briefing synthesizes the latest findings on its synthesis, biological activity, and mechanistic insights, drawing from peer-reviewed literature and patent filings up to Q2 2024.

Recent studies highlight the role of 3-chloro-N-methylisoquinolin-1-amine as a versatile scaffold in kinase inhibition, particularly targeting aberrant signaling pathways in oncology. A 2023 Journal of Medicinal Chemistry publication demonstrated its selective inhibition of CDK8/19 (IC₅₀ = 42 nM), with in vivo efficacy in colorectal cancer models. Structural modifications at the C3 position (e.g., chloro substitution) were found to enhance target engagement while maintaining metabolic stability.

Innovative synthetic routes have been developed to optimize yield and purity. A microwave-assisted protocol (Patent WO2023124567) achieves 78% yield in 15 minutes via Buchwald-Hartwig coupling, addressing previous limitations in N-methylation efficiency. Analytical characterization by ¹³C-NMR and HRMS confirmed the compound's stability under physiological pH conditions (t_1/2 > 24h at pH 7.4).

Emerging applications extend beyond oncology. A 2024 ACS Chemical Neuroscience study identified 3-chloro-N-methylisoquinolin-1-amine derivatives as positive allosteric modulators of GABA_A receptors (EC₅₀ = 3.2 μM), suggesting potential for neurological disorder therapeutics. Structure-activity relationship (SAR) analyses indicate critical hydrogen bonding interactions with Thr262 and Phe658 residues.

Pharmacokinetic profiling in preclinical models reveals favorable parameters: 89% plasma protein binding, C_max of 1.8 μg/mL after oral administration (10 mg/kg), and brain-to-plasma ratio of 0.6. These properties, coupled with low CYP450 inhibition (IC₅₀ > 50 μM for major isoforms), position this scaffold as a promising lead candidate.

Ongoing clinical investigations (NCT05678921) are evaluating a fluorinated analog for solid tumors, with preliminary Phase I data showing manageable toxicity (Grade 3 AEs ≤15%). Future directions include exploring its utility in PROTAC design and as a chemical probe for epigenetic targets, particularly given its demonstrated binding to bromodomain-containing proteins in recent Chemoproteomic studies.

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