透過您的圖書館登入
IP:3.12.152.21
  • 學位論文

樟腦醯胺為掌性輔助基應用於 (+)-2-epi-α-Allokainic Acid 之不對稱合成研究

Asymmetric Synthesis of (+)-2-epi-α-Allokainic Acid Employing Ketopinic Amide as Chiral Auxiliary

指導教授 : 汪炳鈞
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


本論文利用樟腦醯胺139作為掌性輔助基,與甘胺酸第三丁酯142縮合形成之樟腦醯基亞胺116為起始物,經由1,4-加成反應建構立體中心得到單一非鏡像異構物之加成物130;隨後利用胺轉換法將掌性輔助基水解並進行合環反應,合成內醯胺(lactam)結構的焦谷胺酯(pyroglutamate) 147,最後以羥醛反應建構出C4位置具有不對稱中心的紅藻胺酸前驅物157,藉此合成C2-epi-紅藻胺酸 (+)-2-epi-α-Allokainic acid 128。

並列摘要


This thesis deals with the application of camphor-derived ketopinic amide 139 as a chiral auxiliary in the synthesis of pyrrolidine alkaloids. Asymmetric 1,4-addition of chiral imine 116, derived from glycinate 142 and ketopinic amide 139, with α,β-unsaturated ester 142 afforded adduct 130 as a single isomer. Transamination of compound 130, followed by cyclization provided lactam 147. The construction of C4 stereogenic center was achieved by the aldol reaction of boc-protected lactam 147 with acetone. Further functional group transformation led to the synthesis of (+)-2- epi-α-Allokainic acid 128.

參考文獻


[10] Johnston, G. A. R.; Curtis, D. R.; Davies, J.; McCulloch, R. M. Nature 1974, 248, 804.
[5] Murakami, S.; Takemoto, T.; Shimizu, Z. J. Pharm. Soc. Jpn. 1953, 73, 1026.
[9] Watase, H.; Tomiie, Y.; Nitta, I. Bull. Chem. Soc. Jpn. 1958, 31, 714.
[11] Sperk, G. Prog. Neurobiol. (Oxford) 1994, 42, 1.
[14] Oppolzer, W.; Thirring, K. J. Am. Chem. Soc. 1982, 104, 4978.

延伸閱讀