490-91-5, Name is Thymoquinone, molecular formula is C10H12O2, belongs to indole-building-block compound, is a common compound. In a patnet, author is Yao, Guangkai, once mentioned the new application about 490-91-5, Formula: https://www.ambeed.com/products/490-91-5.html.
HFIP-Promoted Bischler Indole Synthesis under Microwave Irradiation
1,1,1,3,3,3-Hexafluoropropan-2-ol (HFIP) was found to be effective for the Bischler indole synthesis under microwave irradiation in the absence of a metal catalyst. Under the catalysis of HFIP, a wide range of -amino arylacetones were successfully transformed into indole derivatives with moderate to good yields.
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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