3-BROMO-5-METHOXYINDOLE-1-CARBOXYLIC ACID TERT-BUTYL ESTER

3-Bromo-5-methoxyindole-1-carboxylic acid tert-butyl ester (CAS 348640-11-9) commonly known as N-Boc-3-bromo-5-methoxyindole, is a strategically protected heterocyclic scaffold engineered for kinase inhibitor development and natural product synthesis. This molecule integrates a 5-methoxyindole core—a privileged pharmacophore prevalent in CNS-active pharmaceuticals and alkaloids—with a bromine substituent at the C3 position and an acid-labile Boc (tert-butoxycarbonyl) protecting group on the nitrogen atom. The C3-bromo handle serves as a privileged site for Pd-catalyzed cross-coupling (Suzuki, Buchwald-Hartwig, Sonogashira), enabling rapid diversification of the indole C3 position, while the 5-methoxy group provides electronic modulation and metabolic stability enhancement. The N1-Boc protection ensures stability under basic and nucleophilic conditions, allowing orthogonal synthetic strategies where the indole nitrogen can be deprotected selectively under mild acidic conditions. This intermediate is particularly valuable for constructing ATP-mimetic kinase inhibitors, serotonin receptor modulators, and tryptophan-derived natural products where precise control over substitution patterns and nitrogen protection is critical. Manufactured under controlled conditions, it supports drug discovery programs requiring modular access to functionalized indole architectures with tunable reactivity.