Synthesis of deuterium-labeled cinnamic acids: Understanding the volatile benzenoid pathway in the flowers of the Japanese loquat Eriobotrya japonica,Journal of Labelled Compounds and Radiopharmaceuticals

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Synthesis of deuterium-labeled cinnamic acids: Understanding the volatile benzenoid pathway in the flowers of the Japanese loquat Eriobotrya japonica
Journal of Labelled Compounds and Radiopharmaceuticals ( IF 0.9 ) Pub Date : 2021-07-09 , DOI: 10.1002/jlcr.3933
Bunta Watanabe ₁ , Shiori Nishitani ₂ , Takao Koeduka ₂

Affiliation

Cinnamic acids are widely distributed in plants, including crops for human use, and exhibit a variety of activities that are beneficial to human health. They also occupy a pivotal position in the biosynthesis of phenylpropanoids such as lignins, anthocyanins, flavonoids, and coumarins. In this context, deuterium-labeled cinnamic acids have been used as tracers and internal standards in food and medicinal chemistry as well as plant biochemistry. Therefore, a concise synthesis of deuterium-labeled cinnamic acids would be highly desirable. In this study, we synthesized deuterium-labeled cinnamic acids using readily available deuterium sources. We also investigated a hydrogen–deuterium exchange reaction in an ethanol-d₁/Et₃N system. This method can introduce deuterium atoms at the ortho and para positions of the phenolic hydroxy groups as well as at the C-2 position of alkyl cinnamates and is applicable to various phenolic compounds. Using the synthesized labeled compounds, we demonstrated that the benzenoid volatiles, such as 4-methoxybenzaldehyde, in the scent of the flowers of the Japanese loquat Eriobotrya japonica are biosynthesized from phenylalanine via cinnamic and 4-coumaric acids. This study provides easy access to a variety of deuterium-labeled (poly)phenols, as well as to useful tools for studies of the metabolism of cinnamic acids in living systems.

中文翻译：

氘标记肉桂酸的合成：了解日本枇杷枇杷花中的挥发性苯类途径

肉桂酸广泛分布于植物中，包括供人类使用的作物，并表现出多种有益于人类健康的活性。它们还在木质素、花青素、类黄酮和香豆素等苯丙素类化合物的生物合成中占有举足轻重的地位。在这种情况下，氘标记的肉桂酸已被用作食品和药物化学以及植物生物化学中的示踪剂和内部标准。因此，非常需要氘标记的肉桂酸的简明合成。在这项研究中，我们使用现成的氘源合成了氘标记的肉桂酸。我们还研究了乙醇-d ₁ /Et _{3中的氢-氘交换反应}N系统。该方法可以在酚羟基的邻位和对位以及肉桂酸烷基酯的C-2位引入氘原子，适用于各种酚类化合物。使用合成的标记化合物，我们证明了日本枇杷枇杷花香味中的苯类挥发物，如 4-甲氧基苯甲醛，是由苯丙氨酸通过肉桂酸和 4-香豆酸生物合成的。这项研究提供了对各种氘标记的（多）酚的轻松访问，以及用于研究生命系统中肉桂酸代谢的有用工具。

更新日期：2021-08-04

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