Reactions of <i>N</i>-Benzyloxycarbamate Derivatives with Stabilized Carbon Nucleophiles: A New Synthetic Approach to Polyhydroxamic Acids and Other Hydroxamate-Containing Mixed Ligand Systems
作者:Yuan Liu、Hollie K. Jacobs、Aravamudan S. Gopalan
DOI:10.1021/jo802410u
日期:2009.1.16
of stabilized carbon nucleophiles to give functionalized protected hydroxamic acids, 3, in good to excellent yields. The O-protected hydroxamate intermediates 3 can be further alkylated with halides to access a variety of potential metal binding hosts. The usefulness of this methodology has been demonstrated by the synthesis of a novel trihydroxamic acid 6, mixed ligand systems 9 and 12, and the macrocyclic
异羟肟酸是一类重要的硬金属离子(如 Fe(III))螯合剂,已在治疗、诊断和分离化学中得到应用。因此,它们的制备和掺入各种基质的方法很重要。已经开发了一种使用容易获得的N-苄氧基氨基甲酸乙酯1来制备异羟肟酸的新策略。Ñ的烷基化1易于发生,得到ñ -烷基- ñ -苄氧基氨基甲酸盐,2,其与各种稳定碳亲核试剂,得到受保护的官能化异羟肟酸,发生反应3,以良好至优异的产量。这O-保护的异羟肟酸酯中间体3可以用卤化物进一步烷基化,以获得各种潜在的金属结合主体。这种方法的有效性已通过新型三异羟肟酸6、混合配体系统9和12以及大环二异羟肟酸16的合成得到证明。