4-Aminophenylboronic acid pinacol ester

4-Aminophenylboronic acid pinacol ester (CAS No.: 214360-73-3) is a small-molecule boronic ester widely utilized as a versatile biochemical reagent and synthetic intermediate in life science and medicinal chemistry research. Functionally, it serves as a reactive building block for the generation of bioactive compounds, including kinase-targeting scaffolds such as receptor tyrosine kinase inhibitors and derivatives that modulate cyclin-dependent kinases and casein kinase pathways, thereby contributing to studies of cell cycle regulation, proliferation, and oncogenic signaling. Through its ability to participate in target-oriented synthesis and molecular modification, it supports the exploration of protein–ligand interactions and the development of compounds capable of modulating enzymatic activity and intracellular signaling cascades. Although direct biological activity data for this compound are limited, related boronic ester derivatives are commonly associated with enzyme interaction profiles and screening activities in the nanomolar to micromolar range. In experimental settings, it is frequently applied in in vitro biochemical assays, cell-based mechanistic studies, and early-stage drug discovery workflows, where dosing and concentration parameters are adjusted according to specific assay conditions and research objectives. Its utility is particularly relevant in studies of kinase signaling, metabolic regulation, and anticancer drug development.