Titanium(III)‐Catalyzed Reductive Decyanation of Geminal Dinitriles by a Non‐Free‐Radical Mechanism
作者:Jens Weweler、Sara L. Younas、Jan Streuff
DOI:10.1002/anie.201908372
日期:2019.12.2
mono-decyanation of geminal dinitriles is reported. The reaction proceeds under mild conditions, tolerates numerous functional groups, and can be applied to quaternary malononitriles. A corresponding desulfonylation is demonstrated as well. Mechanistic experiments support a catalyst-controlled cleavage without the formation of free radicals, which is in sharp contrast to traditional stoichiometric radical decyanations
据报道,钛催化了双腈的单脱氰反应。该反应在温和的条件下进行,可耐受许多官能团,并可用于季戊二腈。还证明了相应的脱磺酰基作用。机理实验支持催化剂控制的裂解而不形成自由基,这与传统的化学计量的自由基脱氰形成鲜明对比。提出了两个TiIII物种参与CC裂解,并研究了添加的ZnCl2和2,4,6-可力丁盐酸盐的有益作用。