4-Bromobenzaldehyde

In the synthetic process, it provides the required para-substituted aromatic ring that becomes part of the atazanavir molecular framework. The aldehyde functional group participates in carbon–carbon bond-forming reactions to construct important side-chain intermediates, while the bromo substituent enables further chemical transformations such as coupling reactions. Because of its suitable reactivity and well-defined substitution pattern, 4-bromobenzaldehyde plays a direct and important role in the efficient synthesis of atazanavir. 4-Bromobenzaldehyde serves as a key starting material and intermediate in the synthesis of atazanavir, an antiretroviral protease inhibitor.