A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, COA of Formula: https://www.ambeed.com/products/555-30-6.html, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 555-30-6, Name is (S)-2-Amino-3-(3,4-dihydroxyphenyl)-2-methylpropanoic acid, molecular formula is C10H13NO4. In an article, author is He, Tingting,once mentioned of 555-30-6.
The applications of a newly designed chiral naphthyl-C2-indole bifunctional phosphine organocatalyst in stereoselective formal [4 + 2] cycloaddition reactions were reported. The chiral naphthyl-C2-indole skeleton was introduced to bifunctional phosphine organocatalysis for the first time, and excellent stereocontrol was achieved in two types of formal [4 + 2] cycloaddition reactions. With the optimal catalyst, a series of chiral spirooxindole and hydrodibenzofuran architectures were produced in moderate to good yields with excellent stereoselectivities (up to >99% ee, >20:1 dr).
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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