透過您的圖書館登入
IP:3.144.25.74
  • 學位論文

利用銠金屬催化3–乙氧基及3–氧代–4–芳基–1,2,5–噻二唑1,1–二氧化物之不對稱烯丙基化合成含四級碳之α-氨基酸

Synthesis of Chiral Quaternary α-Amino Acids via Rh-catalyzed Enantioselective Allylation of 3-Ethoxy and 3-Oxo-4-aryl-1,2,5-thiadiazole-1,1-dioxides

指導教授 : 吳學亮
若您是本文的作者,可授權文章由華藝線上圖書館中協助推廣。

摘要


本論文敘述以不同的烯丙基三氟硼酸鉀鹽試劑3與3–乙氧基–4–芳基–1, 2, 5–噻二唑1, 1–二氧化物1及3–氧代–4–芳基–1, 2, 5–噻二唑1, 1–二氧化物2進行不對稱1, 2-加成反應,成功地合成出一系列的掌性高烯丙胺化合物6,產率最高達到92%,鏡像超越值最高99% ee,非鏡像異構物比例最高達到20:1;以及得到掌性高烯丙胺化合物8,產率最高達到97%,最高鏡像超越值>99.5% ee。 使用加成產物8s,將主架構的五環結構開環得到具有掌性中心四級碳之α-胺基酸衍生物51c,再經由多步反應後,可合成出藥物BMS-561392之鏡像化合物55b。

並列摘要


This thesis describes the enantioselective addition of a variety of potassium allyl trifluoroborates 3 to 3-ethoxy-4-aryl-1,2,5-thiadiazole-1,1-dioxides 1 and 3-oxo-4-aryl-1,2,5-thiadiazole-1,1-dioxides 2, providing the corresponding adducts 6 in up to 92% yield with up to 99% ee and up to 20:1 diastereomeric ratio and 8 in up to 92% yield with 99% ee. The method is useful in offering efficient and convenient synthesis of quaternary α-amino acids, witnessing the synthetic utility in the preparation of ent–BMS-561392 (55a), which is an inhibitor of tumor necrosis factor-α (TNF-α) converting enzyme for the potential treatment of rheumatoid arthritis.

參考文獻


1. Adolph M. Pietruszkiewcz; John J.Baldwin; William A. Bolhofer;
Jacob M. Hoffman; William C. Lumma. J.Heterocyclic Chem. 1983, 20, 821.
2. (a) Katsuki, T.; Sharpless, K. B. J. Am. Chem. Soc. 1980, 102, 5974–
5976. (b) Rossiter, B.; Katsuki, T.; Sharpless, K. B. J. Am. Chem. Soc.
1981, 103, 464–465. (c) Martin, V.; Woodard, S.; Katsuki, T.;

延伸閱讀