Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels. 4940-39-0, Name is 4-Oxo-4H-1-benzopyran-2-carboxylic Acid, molecular formula is C10H6O4. In an article, author is Thopate, Satish B.,once mentioned of 4940-39-0, Recommanded Product: 4940-39-0.
A highly regioselective and stereoselective cascade annulation of indoles with C2-symmetric enone tethered-cyclohexadienones provides rapid access to complex indole alkaloid-like scaffolds in high yields. Interestingly, a different reaction course was observed with 3-substituted indoles giving C-2/N annulation products with similar complexity via intramolecular aza-Michael addition. This desymmetrization approach is highly practical and allows atom-economical synthesis of natural product-like molecules containing several contiguous stereocenters with broad range of substrate scope and high functional-group tolerance. The synthetic utility of the products was demonstrated with various chemoselective, regioselective, and diastereoselective transformations on the highly strained polycyclic indoles to elaborate the value of this tandem reaction.
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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