Asymmetric Synthesis of Lycoperdic Acid.
作者:Shigeyuki YOSHIFUJI、Mamoru KANAME
DOI:10.1248/cpb.43.1617
日期:——
Lycoperdic acid [(2S, 5'S)-2-amino-3-(5'-carboxy-2'-oxo-5'-tetrahydrofuranyl)propanoic acid], isolated from the mushroom Lycoperdon perlatum, was synthesized from trans-4-hydroxy-L-proline by a six-step route involving samarium diiodide (SmI2)-mediated formation of the spiro-γ-lactone and ruthenium tetroxide (RuO4) oxidation of the L-proline ring system to the L-pyroglutamic acid moiety. Lycoperdic acid (1) was found to undergo hydrolysis of the γ-lactone ring in 1 N hydrochloric acid at 23°C, giving an equilibrated mixture of 1 and the corresponding hydroxy acid.
来源于蘑菇 Lycoperdon perlatum 的蕈酸[(2S, 5'S)-2-氨基-3-(5'-羧基-2'-氧-5'-四氢呋喃基)丙酸]是通过 6 步反应路线由反式-4-羟基-L-脯氨酸合成得到,涉及使用二碘化钐(SmI2)形成螺环-γ-内酯和使用四氧化钌(RuO4)将 L-脯氨酸环系氧化成 L-焦谷氨酸部分。蕈酸(1)在 23°C下可以与 1 N 的盐酸反应发生γ-内酯环的水解,生成与相应的羟基酸平衡共存混合物。