6-Fluoro-3-(4-piperidinyl)-1,2-benzisoxazole Hydrochloride丨CAS 84163-13-3

6-Fluoro-3-(4-piperidinyl)-1,2-benzisoxazole hydrochloride is an important intermediate widely used in the pharmaceutical industry, particularly in the synthesis of central nervous system (CNS) active compounds. Its benzisoxazole core, combined with a fluorine-substituted aromatic ring and a piperidinyl moiety, makes it a versatile building block for developing selective receptor modulators, enzyme inhibitors, and neuroactive drugs. It is frequently employed in medicinal chemistry for the synthesis of compounds targeting serotonin, dopamine, or norepinephrine receptors, as well as for the preparation of antidepressants, antipsychotics, and other neurotherapeutic agents. The hydrochloride salt form enhances solubility and stability, facilitating its use in various chemical transformations, including alkylation, acylation, and nucleophilic substitution reactions. Additionally, it serves as a key intermediate in structure–activity relationship (SAR) studies to optimize pharmacokinetics and receptor-binding affinity in drug development.

The benefits of 6-Fluoro-3-(4-piperidinyl)-1,2-benzisoxazole hydrochloride stem from its chemical stability, functional versatility, and pharmacologically relevant structure. The fluorine atom enhances metabolic stability and lipophilicity of downstream derivatives, which can improve bioavailability and receptor selectivity. Its piperidinyl group provides a reactive site for derivatization and contributes to favorable pharmacodynamic properties in CNS-active molecules. The benzisoxazole ring imparts rigidity and planarity, improving binding interactions with biological targets. The hydrochloride form ensures better handling, solubility, and reproducibility during synthesis, making it suitable for both laboratory-scale research and industrial-scale production. These features collectively allow chemists to efficiently design and synthesize bioactive molecules with enhanced efficacy and safety profiles.