Synthesis of Substituted Benzyl Homo-C-Ribonucleosides and -Nucleotides as Carba Analogues of Phosphoribosylanthranilate
作者:Tomáš Kubelka、Lenka Slavětínská、Michal Hocek
DOI:10.1002/ejoc.201200819
日期:2012.9
tryptophan biosynthesis. The synthesis was based on the preparation of TBS-protected 2-bromobenzyl C-ribonucleoside 4a by addition of (2-bromobenzyl)magnesium bromide to ribonolactone followed by reduction and subsequent functional group transformations. Pd-catalyzed hydrogenation, cross-couplings, amination or hydroxylation, as well as lithiation followed by reaction with CO2 and amidations, gave a large
新的 2-取代苄基 C-核糖核苷和 β-核苷酸被设计为磷酸核糖邻氨基苯甲酸的 carba 类似物,这是色氨酸生物合成的关键中间体。该合成基于通过将 (2-溴苄基) 溴化镁添加到核糖内酯,然后还原和随后的官能团转化来制备 TBS 保护的 2-溴苄基 C-核糖核苷 4a。Pd 催化的氢化、交叉偶联、胺化或羟基化,以及锂化,然后与 CO2 和酰胺化反应,得到大量的 2-烷基-、2-(杂)芳基、2-氨基、2-羟基、 2-羧基和2-氨基甲酰基衍生物,脱保护后得到游离的高-C-核糖核苷。一些标题核苷被转化为 5'-O-磷酸酯。