TCI B5903 4-Bromoindolin-2-one (CAS 99365-48-7) is a bromo-substituted heterocyclic building block belonging to the indolinone class, widely employed in organic synthesis and medicinal chemistry research. Its core structure serves as a versatile intermediate for constructing indole-fused frameworks, and the bromo substituent at the 4-position enables further functionalization via cross-coupling reactions such as Suzuki-Miyaura and Buchwald-Hartwig. This compound is commonly utilized in the development of kinase inhibitors, receptor modulators, and other bioactive small molecules.
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