NNN pincer Ru(II)-catalyzed dehydrogenative coupling of 2-aminoarylmethanols with nitriles for the construction of quinazolines
作者:Xiao-Min Wan、Zi-Lin Liu、Wan-Qing Liu、Xiao-Niu Cao、Xinju Zhu、Xue-Mei Zhao、Bing Song、Xin-Qi Hao、Guoji Liu
DOI:10.1016/j.tet.2019.03.046
日期:2019.5
Ru(II)-catalyzed preparation of quinazolines via acceptorless dehydrogenative strategy has been developed. Under the optimized conditions, a broad range of substituted o-aminobenzyl alcohols and (hetero)aryl or alkyl nitriles were well tolerated to afford various 2-substituted quinazolines in high yields. Subsequently, a set of control experiments have been performed to elucidate the reaction mechanism,
通过无受体脱氢策略开发了一种有效的NNN钳入Ru(II)催化的喹唑啉制备方法。在优化的条件下,很好地耐受了广泛范围的取代的邻氨基苄醇和(杂)芳基或烷基腈,从而以高收率提供了各种2-取代的喹唑啉。随后,进行了一系列对照实验以阐明反应机理,该机理经历了醇氧化,腈水合和环缩合步骤。当前的协议具有几个优点,例如环境友好,操作简便,底物范围广(与脂族腈兼容,产率高达87%)和反应时间短(大部分在2小时之内)。