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采用了最近热门的Rh(III)催化C?H键活化方法,以N-甲氧基苯甲酰胺系列物为反应底物, N-氰基-N-苯基对甲苯磺酰胺(NCTS)为氰基化试剂,高效合成了含氰基官能团产物。结果表明,该反应在碳酸银存在下,使用二氧六环作为反应溶剂,于80°C反应8h生成的邻位氰基取代的N-甲氧基苯甲酰胺的产率较高。进一步研究表明,该反应具有好的区域选择性和底物/官能团适应性。一系列机理实验研究表明,该反应可能采用了一个内部的亲电取代机制及使用了C?H键切割步骤作为关键限速步骤。考虑到该反应产物包含有价值的结构单元-N-甲氧基甲酰胺和氰基取代基,因而有望用于现代有机合成中。

A new method has been developed for the mild and efficient Rh(III)-catalyzed direct C?H cyanation of a diverse range of N-methoxybenzamides using N-cyano-N-phenyl-p-toluenesulfonamide as an environmentally friendly and efficient cyanating reagent. This new reaction proceeded with good regioselectivity to provide direct access to a wide variety of valuable ortho-cyanated N-methox-ybenzamides with board substrate/functional group tolerance.

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