Delcosine (lucaconine) and its derivatives have all been shown to lose one mole of water, upon treatment with acetyl chloride, thus giving an anhydro compound. On the basis of the observation of the infrared spectra of anhydro-diacetyldelcosine, anhydro-oxodelcosine, and anhydro-1, 10-didehydro-oxodelcosine, it may be concluded that, in each compound, dehydration takes place between two tertiary hydroxyl groups, with a ketone carbonyl group being formed. Based on a tentative structure for delcosine proposed by Marion and his co-workers, structures for anhydro-diacetyldelcosine and anhydro-oxdelcosine are proposed. On hydrogenation over platinum in acetic acid, anhydro-diacetyldelcosine yielded anhydro-dihydro-diacetyl-delcosine. Anhydro-oxodelcosine was inert under these reduction conditions. On the basis of these experimental results, a possible mechanism of this novel hydrogenation is proposed. The ultraviolet spectrum of anhydro-diacetyldelcosine, with a new type of chromophore, is also shown.
研究表明,当用
乙酰氯处理时,Delcosine(露卡宁)及其衍
生物都会失去一摩尔的
水,从而生成一种脱
水化合物。根据对脱
水-
二乙酰基
鹅掌楸碱、脱
水-氧代
鹅掌楸碱和脱
水-1,10-二脱
水-氧代
鹅掌楸碱红外光谱的观察,可以得出结论:在每种化合物中,两个叔羟基之间都发生了脱
水反应,并形成了一个酮羰基。根据马里恩和他的同事们提出的脱氢
二乙酰脱氢
鹅掌楸碱的暂定结构,提出了脱氢
二乙酰脱氢
鹅掌楸碱和脱氢氧脱氢
鹅掌楸碱的结构。在
醋酸中用
铂进行氢化时,脱
水二乙酰基鹅膏蕈碱生成脱
水二乙酰基鹅膏蕈碱。在这些还原条件下,脱
水氧代
鹅掌楸碱是惰性的。根据这些实验结果,提出了这种新型氢化反应的可能机理。此外,还展示了带有新型发色团的脱
水二乙酰基鹅膏蕈碱的紫外光谱。