Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 1,4-Dibromobutane, is researched, Molecular C4H8Br2, CAS is 110-52-1, about Accessing Polycyclic Heteroarenes Enabled by Copper-Catalyzed Aerobic Oxidative C-H/C-H [4 + 2] Annulation of 3-Arylindole Derivatives.HPLC of Formula: 110-52-1.
Several polycyclic aromatic hydrocarbons I (R = Ph, naphthalen-2-yl, 3,4-difluorophenyl, etc.; R1 = H, t-Bu, trifluoromethyl, ethoxycarbonyl; R2 = H, 3-Me, 4-OMe, 2,3-dichloro, etc.; R3R4 = -(CH=CH-CH=CH)-) are delivered at room temperature by copper-catalyzed aerobic oxidative C-H/C-H [4 + 2] annulation of alkyl-substituted 3-arylindole derivs II (R5 = 4-phenylbut-3-yn-1-yl, 2-(2-phenylethynyl)phenyl, 2-[2-(4-chlorophenyl)ethynyl]benzen-1-yl, etc.). Specifically, dual aryl C-H functionalization is furnished under mild conditions through the 1,2-migration of copper catalyst and regioselective alkyne insertion. Mechanistic experiments demonstrate that the C-H bond cleavage on the indole and Ph rings is not involved in the rate-limiting step.
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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