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. 152121-30-7, Name is SB-202190, molecular formula is C20H14FN3O. In an article, author is Wani, Imtiyaz Ahmad,once mentioned of 152121-30-7, Formula: https://www.ambeed.com/products/152121-30-7.html.
A simple and efficient synthetic route to various 1,4-disubstituted tetrahydro-beta-carbolines and tetrahydropyrano[3,4-b]indoles in high yields and stereoselectivity via LiClO4-catalyzed S(N)2-type ring opening of aziridines and epoxides with indoles followed by p-toluenesulfonic acid (PTSA) catalyzed Pictet-Spengler reaction is described.
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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