Facile Synthesis of Hydroxyformamidines by the N-Oxidation of Their Corresponding Formamidines
作者:Garry Hanan、Mihaela Cibian、Sophie Langis-Barsetti
DOI:10.1055/s-0030-1259329
日期:2011.2
The N-oxidation of N,N′-disubstituted amidines with MCPBA (m-chloroperoxibenzoic acid) affords a mild, rapid, and efficient route to the corresponding hydroxyamidines This novel synthetic route for the preparation of N,N′-disubstituted hydroxyamidines provides an attractive alternative to the classical one. It was found that the efficiency of the N-oxidation reaction, and the stability of the hydroxyformamidines are influenced by the substitution on the N,N′-diaryl rings, for example, higher yields (up to 92%) and more stable products are obtained for the compounds bearing substituents in the 2,6-positions of the phenyl rings. ¹H NMR and ¹³C NMR, HRMS and/or elemental analysis were used to characterize the products.
用 MCPBA(间氯过氧苯甲酸)对 N,N′-二取代脒进行 N-氧化反应,可以温和、迅速且高效地制备相应的羟基脒。这一新的合成路线为制备 N,N′-二取代羟基脒提供了有吸引力的替代方案,取代经典的合成方法。研究发现,N-氧化反应的效率以及羟基甲脒的稳定性受到 N,N′-二芳基环上取代基的影响,例如,带有苯环2,6-位取代基的化合物可以获得更高的产率(高达92%)和更稳定的产品。产物通过¹H NMR、¹³C NMR、HRMS 和/或元素分析进行表征。