The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 551-16-6, Name is 6-APA, SMILES is [C@H]12SC([C@@H](N1C(=O)[C@H]2N)C(=O)O)(C)C, in an article , author is Zhu, Yingjun, once mentioned of 551-16-6, Computed Properties of https://www.ambeed.com/products/551-16-6.html.
An one-pot two-step three-component reaction of 2-indolinone, aromatic aldehydes and 1-aryl-3-trifluoromethyl-5-pyrazolone afforded trifluoromethylated poly-heterocyclic compounds containing pyrazolo [4′,3′:5,6]pyrano[2,3-b]indole skeleton. This atom economic and facile manipulative reaction involved initial treatment of three-component reaction mixtures with molecular iodine, followed by intramolecular annulation reaction with POCl3 in one-pot manner without isolation. Compared with the step-wise reactions, a more consecutive approach to trifluoromethylated pyrazolo[4′,3′:5,6]pyrano[2,3-b]indoles was achieved.
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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