Phosphinic Acid Pseudopeptides Analogous to Glutamyl-<i>γ</i>-glutamate: Synthesis and Coupling to Pteroyl Azides Leads to Potent Inhibitors of Folylpoly-γ-glutamate Synthetase
作者:Nadya Valiaeva、David Bartley、Tsutomu Konno、James K. Coward
DOI:10.1021/jo010283t
日期:2001.7.1
required. Alkylation and conjugate addition reactions of trivalent phosphorus (P(III)) species were investigated. In situ generation of bis-trimethylsilyl esters of phosphinous acids proved to be an effective route to phosphinates of modest structural complexity. However, this chemistry could not be extended to the incorporation of an amino acid moiety at the N-terminal side of the desired phosphinate. A
已经研究了几种类似于γ-谷氨酰基肽Glu-γ-Glu的复杂次膦酸酯磷酸肽的途径。由于需要升高的温度,发现通过向被保护的乙烯基甘氨酸中添加磷基基团来形成γ-膦酰基谷氨酸衍生物具有有限的价值。研究了三价磷(P(III))的烷基化和共轭加成反应。次膦酸的双三甲基甲硅烷基酯的原位生成被证明是具有中等结构复杂性的次膦酸酯的有效途径。但是,这种化学方法不能扩展到在所需次膦酸酯的N-末端侧掺入氨基酸部分。使用P(III)化学方法和脱卤化氢成功合成了目标次膦酸酯磷酸肽,得到α,β-不饱和次膦酸酯,然后共轭添加二乙基乙酰胺基丙二酸酯和酸介导的水解得到所需的次膦酸酯磷酸肽。未保护的次膦酸酯磷酸肽与衍生自叶酸和甲氨蝶呤的两个酰基叠氮化物的偶联导致感兴趣的相应的蝶酰基磷酸肽,因为叶酰聚谷氨酸合成酶催化反应中四面体中间体的可能模拟。