Bi(OTf)<sub>3</sub>-Catalyzed Intramolecular Amination of Triazenylaryl Allylic Alcohols: A Stereoselective, High-Yield Synthesis of (<i>E</i>)-3-Alkenyl 2<i>H</i>-indazoles
<div><p></p><p>An efficient Bi(OTf)<sub>3</sub>-catalyzed synthesis of 3-alkenyl-2-pyrrolidine-2H-indazoles from triazenylaryl allylic alcohols via the intramolecular direct amination process is reported. Compared with the dodecyl benzenesulfonic acid (DBSA)-catalyzed method, the new method is more efficient and gives greater yields and functionality tolerance. Additionally, the 3-alkenyl-2-pyrrolidine-2H-indazoles can be transformed to a series of new products under different reaction conditions.</p>
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