4‐Benzothiatriazine‐1,1(2H)‐dioxides reacted with allenes in the presence of a nickel(0)/(R)‐quinap complex to produce a variety of substituted 3,4‐dihydro‐1,2‐benzothiazine‐1,1(2H)‐dioxides in a regio‐ and enantioselective fashion. An intermediate nickelacycle was generated through denitrogenative activation of the triazo moiety which allowed the intermolecular incorporation of an allene group. quinap=1‐
Nickel-Catalyzed Denitrogenative Cyclization of 1,2,3,4-Benzothiatriazin-1,1(2<i>H</i>)-dioxides with Arynes To Synthesize Biaryl Sultams
作者:Vijaykumar H. Thorat、Yu-Lin Tsai、Yong-Ran Huang、Chien-Hong Cheng、Jen-Chieh Hsieh
DOI:10.1021/acs.orglett.2c00920
日期:2022.4.22
Herein, we report the nickel-catalyzed denitrogenative cyclization reaction of 1,2,3,4-benzothiatriazine-1,1-dioxides with arynes to generate the polysubstituted biaryl sultams with tolerance of a wide diversity of substituents on every subunit. The mechanistic study indicates that the reaction is initiated by the formation of a diradical species, which reacts with a nickel complex to form a nickelacycle