• 제목/요약/키워드: (-)-${\beta}$-Narcotine

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(-)-${\beta}$-Narcotine: A Facile Synthesis and the Degradation with Ethyl Chloroformate

  • Lee, Dong-Ung
    • 대한약학회:학술대회논문집
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    • 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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    • pp.348.3-349
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    • 2002
  • (-)-${\alpha}$-narcotine( 1 R.9S) is one of the major bases in Papaver somniferum L.. the sourse plant for opium. while (-)-${\beta}$-narcotine(1R.9R) is a synthetic phthalideisoquinoline alkaloid. Although some advanced methods for the preparation of $\alpha$-narcotine have been developed using modified Bischler-Napieralski cyclization. the facile synthesis of $\beta$-narcotine has not further been attempted. supposingly because of its no clinical efficacy contrary to $\alpha$-narcotine having an antitussive effect. (omitted)

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(-)-α-Narcotine과 유사화합물을 ethyl chloroformate로 반응시 생성된 분해물의 입체화학 (Stereochemistry of the Degradation Product of (-)-α-Narcotine and Its Analogs with Ethyl Chloroformate)

  • 이동웅
    • 생명과학회지
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    • 제15권1호
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    • pp.147-151
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    • 2005
  • 양귀비의 성분중 하나인 $(-)-\alpha-narcotine$은 ethyl chloroformate와 가온반응시 diastereomeric chloro-carbamate 혼한물과 Z/E-enol lactone혼합물을 생성하였는데 이 중에서 Z/E-isomer의 생성비를 HPLC로 측정한 결과 Z:E=1:1.12로 나타나 열역학적으로 불안정한 E-isomer가 다소 많이 생성되었다. 그러나 이 isomer 혼합물을 chromatography로 각각 분리 한 결과, 그 생성 비는 Z:E=7:1로 나타나 분리도중에 column 내 에서 E-isomer가 보다 안정한 Z-isomer로 대부분 변하였음을 알 수 있었다. Z/E-isomer의 생성비가 유사한 구조의 화합물에서 어떻게 변하는지를 관찰하기 위하여 $\beta-narcotine$, deuterated $\beta-narcotine$$\beta-hydrastine$을 대상으로 동일한 조건하에 반응시킨 결과, 이들의 isomer 생성비율이 구조에 따라 크게 차이가 있음을 알 수 있었으며 그 이유를 설명하였다. 한편, 일반적인 보고와는 달리, narcotine에서 생성된 안정한 Z-isomer는 광화학반응에 의해 불안정한 E-isomer로 쉽게 변한다는 사실도 확인하였다.

(-)-β-Narcotine: A Facile Synthesis and the Degradation with Ethyl Choroformate

  • Lee, Dong-Ung
    • Bulletin of the Korean Chemical Society
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    • 제23권11호
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    • pp.1548-1552
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    • 2002
  • $(-)-\beta-Narcotine$ (6), a phthalideisoquinoline alkaloid, was synthesized conveniently by the direct condensation of cotarnine (1) and iodomeconine (2) prepared by aromatic iodination using thallium trifluoroacetate/KI and by the successive reduction of resulting $iodo-{\beta}-narcotine$ (5) with aluminum amalgam. Its structure including a stereochemistry was confirmed by instrumental analyses. This synthetic alkaloid was degraded with ethyl chloroformate at room temperature to afford the chloro-carbamate 6b as a crystalline intermediate, which was unexpectedly converted into the carbinol 8 by exchange of Cl with OH of water contained in the solvents and the ethoxy-carbamate 9, probably because of ethanol added to chloroform as a solvent stabilizer during the purification by column chromatography.