With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.14618-45-2,3-(Trifluoroacetyl)indole,as a common compound, the synthetic route is as follows.
14618-45-2, General procedure: One of compounds 3a-3f (20 mmol) was dissolved in DMF (10 mL). Trifluoroacetic anhydride (4.2 mL, 30 mmol) was added dropwise at 0C. After stirring for 3.5 h, water was added, the solid filtered off and treated with 20% NaOH (40 mL, 0.2 mol) at 55C overnight. Upon cooling down, the solution was extracted with Et2O. The aqueous phase was acidified with concentrated HCl and the residue was filtered off to give one of compounds 4a-4f. 1H-Indole-3-carboxylic acid (4a). White solid, yield 81%, mp 216-218C (214C [20]). 1H NMR spectrum, delta, ppm: 7.15 t (J = 8.0 Hz, 2H, ArH), 7.45 d (J = 8.0 Hz, 2H, ArH), 8.00 s (1H, CH-N), 11.81 s (1H, COOH), 11.93 s (1H, NH).
14618-45-2 3-(Trifluoroacetyl)indole 589126, aindole-building-block compound, is more and more widely used in various fields.
Reference：
Letter; Zhang; Xu; Wang; Kang; Russian Journal of General Chemistry; vol. 87; 12; (2017); p. 3006 – 3016;,
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