Chemoenzymatic Synthesis of Phosphonic Acid Analogues of L-Lysine, L-Proline, L-Ornithine, and L-Pipecolic Acid of 99 % ee - Assignment of Absolute Configuration to (-)-Proline
作者:Frank Wuggenig、Anna Schweifer、Kurt Mereiter、Friedrich Hammerschmidt
DOI:10.1002/ejoc.201001501
日期:2011.4
72 % furnished (S)-alcohols of 99 % ee. These were converted via azides into the phosphonic acid analogues of L -lysine, L -proline, L -ornithine and L -pipecolic acid. (-)-Phosphaproline was transformed into crystalline ureas derived from (R)- and (S)-1-phenylethyl isocyanate. X-ray structure analyses revealed that the levorotary phosphaproline has the R configuration, contrary to earlier reports.
(±)-ω-Halo-α-(氯乙酰氧基)膦酸酯通过使用蛋白酶 (Chirazyme® P-2) 进行动力学拆分。酯以 56% 到 72% 的转化率回收,提供的 (S)-醇为 99% ee。这些通过叠氮化物转化为 L-赖氨酸、L-脯氨酸、L-鸟氨酸和 L-哌啶酸的膦酸类似物。(-)-磷酸脯氨酸转化为衍生自 (R)- 和 (S)-1-苯基乙基异氰酸酯的结晶尿素。X 射线结构分析显示左旋磷酸脯氨酸具有 R 构型,这与早期的报道相反。