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。