A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Recommanded Product: 19012-03-4, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 19012-03-4, Name is 1-Methyl-1H-indole-3-carbaldehyde, molecular formula is C10H9NO. In a Article, authors is Abouabdellah, Ahmed，once mentioned of 19012-03-4
The enolate of 4-N-(tert-butyloxycarbonyl)aminobutyro-gamma-lactone 9 reacted with 2-bromo-1methylindole-3-carboxaldehyde in the presence of stannic chloride to give the product of aldol condensation 16. Deprotection and dehydration of the latter with trifluoroacetic acid and dimethyl sulfide followed by Pd2(dba)3 -catalyzed ring closing of the product afforded the alpha-carboline 6 in good overall yield.
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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