A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 86-95-3, Name is 4-Hydroxyquinolin-2(1H)-one, molecular formula is C9H7NO2. In an article, author is Festa, Alexey A.,once mentioned of 86-95-3, Formula: https://www.ambeed.com/products/86-95-3.html.
A selective route to the formation of 1-alkoxypyrazino[1,2-a]indole-3-amines through alcohol-initiated dinitrile cyclization, starting from N-(cyanomethyl)indole-2-carbonitriles under basic conditions, was discovered. The resulting compounds were shown to be unstable in solution, and a three-component reaction of the dinitrile, alcohol, and aromatic aldehyde was used to overcome the problem.
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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