Synthesis of 7-<sup>15</sup>N-Oroidin and Evaluation of Utility for Biosynthetic Studies of Pyrrole−Imidazole Alkaloids by Microscale <sup>1</sup>H−<sup>15</sup>N HSQC and FTMS
作者:Yong-Gang Wang、Brandon I. Morinaka、Jeremy Chris P. Reyes、Jeremy J. Wolff、Daniel Romo、Tadeusz F. Molinski
DOI:10.1021/np900638e
日期:2010.3.26
Numerous marine-derived pyrrole−imidazole alkaloids (PIAs), ostensibly derived from the simple precursor oroidin, 1a, have been reported and have garnered intense synthetic interest due to their complex structures and in some cases biological activity; however very little is known regarding their biosynthesis. We describe a concise synthesis of 7-15N-oroidin (1d) from urocanic acid and a direct method
许多海洋衍生的吡咯-咪唑生物碱 (PIA),表面上来自简单的前体 oroidin 1a,已被报道并由于其复杂的结构和在某些情况下的生物活性而引起了强烈的合成兴趣;然而,关于它们的生物合成知之甚少。我们描述了从尿刊酸中简明合成 7- 15 N-oroidin ( 1d ) 以及通过脉冲标记和 1D 1 H- 15 N HSQC NMR 和 FTMS分析测量15 N 掺入的直接方法。使用模拟脉冲标记实验,我们估计了通过 1D 1 H− 15掺入新生物合成 PIA 的检测限 (LOD)N HSQC在 1500 μg 未标记的 oroidin(每 1600 份约 1 份)的背景下相当于 0.96 μg 的15 N-oroidin(2.4 nmole)。7- 15 N-Oroidin 将在活海绵的生物合成喂养实验中发挥作用,以提供直接信息来阐明导致更复杂的吡咯-咪唑生物碱的途径。