Studies on Acetylenic Compounds. XLIII. Synthesis of Ibotenic Acid.
作者:Yukichi Kishida、Tetsuo Hiraoka、Junya Ide、Atsusuke Terada、Norio Nakamura
DOI:10.1248/cpb.15.1025
日期:——
Ibotenic acid (α-amino-3-hydroxy-5-isoxazoleacetic acid monohydrate) (I), a flycidal amino acid isolated from Amanitae fungi, was synthesized. The reaction of ethyl 4, 4-diethoxytetrolate (V) with hydroxylamine in the presence of alkali gave 3-hydroxy-5-isoxazolecarboxaldehyde diethyl acetal (VI), which was hydrolyzed with 50% AcOH to the corresponding 3-hydroxy-5-isoxazolecarboxaldehyde (II). Strecker or Bucherer reaction of II followed by alkaline hydrolysis afforded I, which was identical with the natural ibotenic acid.
Ibotenic acid(α-氨基-3-羟基-5-异恶唑乙酸一水合物)(I)是从天蝇科真菌中分离出来的一种杀蝇氨基酸。4,4-二乙氧基四甲酸乙酯(V)与羟胺在碱存在下反应生成 3-羟基-5-异恶唑甲醛二乙缩醛(VI),用 50%的 AcOH 将其水解为相应的 3-羟基-5-异恶唑甲醛(II)。对 II 进行 Strecker 或 Bucherer 反应,然后进行碱性水解,可得到 I,它与天然的异烟酸相同。