Studies on the Synthesis of Emetine. II. Synthesis of Rubremetinium Bromide
作者:Yoshio Ban
DOI:10.1248/cpb1953.3.53
日期:——
Synthesis of rac-emetine was attempted on the working basis described in the preceding paper, 1) starting from homoveratrylamine, formaldehyde, and ethylmalonic acid. Distinct from the former case, most of the important intermediates were not obtained in a crystalline state, rendering the structure of the ultimate compound ambiguous. When however the penultimate compound, tetradehydroemetinium salt (XII) was submitted to dehydrogenation by means of mercuric acetate, there was obtained rac-rubremetinium bromide (I) in beautifully crystallized state. Structural identity of this salt with the one prepared from natural emetine was established through the direct comparison of their ultrabiolet and infrared spectra. Evidence was thus provided for the correctness of this route for the synthesis of emetine.
在前一篇论文所述的工作基础上,我们尝试合成了 rac-emetine,1) 起始原料是高藜芦碱、甲醛和乙基丙二酸。与前者不同的是,大多数重要的中间体都不是以结晶状态获得的,因此最终化合物的结构并不明确。不过,当倒数第二种化合物--四去氢美丁鎓盐(XII)通过醋酸巯基进行脱氢反应时,得到了结晶状态非常漂亮的rac-rubremetinium bromide(I)。通过直接比较它们的紫外光谱和红外光谱,确定了这种盐与天然依美汀制备的盐的结构相同。从而证明了这一合成依美汀路线的正确性。