Catalytic amounts of B(C6F5)3 have been found to be able to promote the intramolecular cyclization of vinyl-substituted N,N-dialkyl arylamines to afford nitrogen-containing heterocycles. Our mechanistic studies indicate the reaction is initiated by abstraction of an α-hydride from an N-alkyl substituent by B(C6F5)3, which is followed by cyclization, and is concluded by delivery of the hydride to the
已经发现催化量的B(C 6 F 5)3能够促进
乙烯基取代的N,N-二烷基芳基胺的分子内环化,从而提供含氮杂环。我们的机理研究表明,该反应是通过B(C 6 F 5)3从N-烷基取代基中提取一个
氢化物引发的,然后进行环化反应,并通过将该
氢化物传递至环状阳离子中间体而结束。B(C 6 F 5)3的双重作用首先用作氧化剂,然后用作携带
氢化物的还原剂,使sp 3碳与富电子烯烃之间罕见的氧化还原中性环化过程得以实现,而无需使用过渡
金属或外部氧化剂。