A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, SDS of cas: 17826-04-9, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 17826-04-9, Name is 6-Bromo-1H-indole-3-carbaldehyde, molecular formula is C9H6BrNO. In a Article, authors is Jiang，once mentioned of 17826-04-9
The total synthesis of the cytotoxic marine alkaloid, (±)-dragmacidin, trans-6,7-dibromo-3-[5-(6-bromo-1H-indol-3-yl)-4-methyl-2-piperazinyl] -1H-indol-4-ol, is described. The synthesis proceeds through the condensation of (6-bromoindol-3-yl)-alpha-(methylamino)acetonitrile with (6,7-dibromo-4-methoxyindol-3-yl)-alpha-oxoacetyl chloride. The product of this condensation was converted in two steps to an intermediate containing the central diketopiperazine ring which after reduction and deprotection gave the racemic natural product along with its cis isomer. An efficient preparation of 6,7-dibromo-4-methoxyindole is also presented.
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Reference：
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles