Syntheses of per-15N labeled etioporphyrins I–IV and a related tetrahydrobenzoporphyrin for applications in organic geochemistry and vibrational spectroscopy
作者:Timothy D. Lash、Shaohua Chen
DOI:10.1016/j.tet.2005.09.105
日期:2005.12
and assignment of vibrational spectra for sedimentary porphyrins. Etioporphyrin-I was prepared via pyrromethene intermediates, while etioporphyrins II–V and a related tetrahydrobenzoporphyrin were synthesized via stepwise routes involving the copper(II) mediated cyclization of a,c-biladienes as the key step. Detailed analyses of both the proton and carbon-13 NMR spectra provide nitrogen-15 coupling
氮15标记的吡咯已使用Barton-Zard,Knorr和Kleinspehn方法由市售的15 N甘氨酸或亚硝酸钠制得。这些吡咯用作合成每15 N标记的卟啉所需要的中间体,用于分析和分配沉积卟啉的振动光谱。Etioporphyrin-I是通过吡咯甲烯中间体制备的,而Eioporphyrins II-V和相关的四氢苯并卟啉是通过逐步路线合成的,其中铜(II)介导的a,c-胆二烯环化是关键步骤。质子和碳13 NMR光谱的详细分析为这些重要结构提供了氮15耦合常数。