1-Propanephosphonic Acid Cyclic Anhydride (T3P) as an Efficient Promoter for the Lossen Rearrangement: Application to the Synthesis of Urea and Carbamate Derivatives
作者:Vommina Sureshbabu、Basavalingappa Vasantha、Hosahalli Hemantha
DOI:10.1055/s-0030-1258158
日期:2010.9
The synthesis of hydroxamic acids starting from carboxylic acids employing 1-propanephosphonic acid cyclic anhydride (T3P) activation is described. Application of ultrasonication accelerates this conversion. Further, the T3P has also been employed to activate the hydroxamates, leading to isocyanates via the Lossen rearrangement. The isocyanates were trapped with suitable nucleophiles to afford the
描述了使用1-丙烷膦酸环酐(T3P)活化从羧酸开始的异羟肟酸的合成。超声处理的应用加速了这种转化。此外,T3P也已用于活化异羟肟酸酯,通过Lossen重排产生异氰酸酯。用合适的亲核试剂捕获异氰酸酯,得到相应的脲和氨基甲酸酯。 T3P-异羟肟酸-洛森重排-异氰酸酯