• 제목/요약/키워드: chiral resolution

검색결과 168건 처리시간 0.027초

Chiral Separation of the Enantiomers of Metoprolol and Its Metabolites by High Performance Liquid Chromatography

  • Kim, Kyeong-Ho;Shin, Sang-Duk;Lee, Joo-Hyun;Lee, Sang-Cheal;Kang, Jong-Seong;Mar, Woong-chon;Hong, Seon-Pyo;Kim, Hyun-Ju
    • Archives of Pharmacal Research
    • /
    • 제23권3호
    • /
    • pp.230-236
    • /
    • 2000
  • (1'R, 2R)-, (1'R, 2S)-, (1'S, 2R)- and (1'S, 2S)-$\alpha$-hydroxymetoprolol; (2R)- and (2S)-O-des-methylmetoprolol; and (2R)- and (2S)-metoprolol acid are major metabolites of (2R)-and (2S)-metoprolol, $\beta$-adrenergic antagonist. The focus of most chiral separation methods until now has been on determination of the enantiomeric parent drug. However, it is just as important to be able to follow the metabolism of the enantiomers and their possible chiral metabolites. Therefore, for the study of stereoselective metabolism and pharmacokinetics of metoprolol, the chiral separation of the enantiomers of metoprolol and its metabolites has been investigated using four chiral stationary phases, i.e., Chiralcel OD, Chiral-AGP, Cyclobond I and Sumichiral OA-4900 columns. Metoprolol acid was resolved only by Sumichiral OA-4900. Chiralcel OD provided the highest separation factor and resolution value for metoprolol and O-desmethylmetoprolol and partially resolved the four stereoisomers of $\alpha$-hydroxymetoprolol. Diastereomeric $\alpha$-hydroxymetoprolols were resolved using the coupled column chromatographic system of two chiral stationary phases, Sumichiral OA-4900 column and Chiralcel OD column.

  • PDF

Liquid Chromatographic Resolution of Racemic Drugs on Various $\alpha$-Arylalkylamine Derived Chiral Stationary Phases

  • Hyun, Myung-Ho;Pirkle, William H.
    • Bulletin of the Korean Chemical Society
    • /
    • 제8권1호
    • /
    • pp.45-47
    • /
    • 1987
  • After conversion to their 3,5-dinitrobenzoyl or 3,5-dinitroanilide derivatives, the enantiomers of a number of drugs may be chromatographically separated on various ${\alpha}$-arylalkylamine-derived chiral stationary phases (CSPs). While each CSP used in this study is useful, CSP 1 is best able to resolve the 3,5-dinitroanilide derivative of Ibuprofen while CSP 9 generally gives rather large ${\alpha}$ values for the resolution of 3,5-dinitrobenzoyl derivatives of the enantiomers of ${\beta}$-adrenergic blocking drugs.

Chiral Separation on Sulfonated Cellulose Tris(3,5-dimethylphenylcarbamate)-coated Zirconia Monolith by Capillary Electrochromatography

  • Lee, Jeong-Mi;Jang, Myung-Duk;Park, Jung-Hag
    • Bulletin of the Korean Chemical Society
    • /
    • 제33권8호
    • /
    • pp.2651-2656
    • /
    • 2012
  • Sulfonated cellulose tris(3,5-dimethylphenylcarbamate) (SCDMPC)-coated zirconia monolith (ZM) was used as the chiral stationary phase in capillary electrochromatography for separation of enantiomers of ten chiral compounds in acetonitrile (ACN)-phosphate buffer mixtures as the eluent. Influences of the ACN content, buffer concentration and pH on chiral separation have been investigated. Separation data on SCDMPC-ZM have been compared with those on CDMPC-ZM. Resolution factors were better on SCDMPC-ZM than CDMPC-ZM while retention factors were in general shorter on the former than the latter. Best chiral resolutions on SCDMPC-ZM were obtained with the eluent of 50% ACN containing 50 mM phosphate at pH around 4.

염화갈륨, 인듐 및 탈륨 함유 이분자형 키랄 살렌 촉매에 의한 라세믹 알킬 글리시딜레이트 유도체의 비대칭 가수분해반응 (Hydrolytic Kinetic Resolution of Racemic Alkyl-glycidyl Derivatives by using Dimeric Chiral Salen Catalyst Containing Ga, In and TlCl3)

  • 신창교;카테카 라울;김건중
    • 공업화학
    • /
    • 제18권3호
    • /
    • pp.218-226
    • /
    • 2007
  • 키랄성 말단기의 에폭사이드는 키랄중간체나 여러 출발물질로서 다양하게 이용되기 때문에 입체선택적인 합성방법은 학술적으로나 산업적인 관점에서 대단히 흥미롭다. 본 연구에서는 염화갈륨, 인듐 및 탈륨을 함유한 2분자형의 키랄성 코발트 살렌 촉매를 새로이 합성하고 그 특성을 평가하였다. 촉매가 2분자형을 갖는지의 직접적인 증거를 질량분석과 EXAF분석을 통하여 제시하였다. 합성한 촉매는 여러 종류의 에테르 및 에스테르 그룹을 함유한 에폭사이드 유도체의 가수분해의 속도차에 의한 비대칭 고리열림반응에 적용하여 그 활성과 선택성을 조사하였다. 합성이 용이한 2분자구조의 살렌착체 촉매는 물을 친핵체로 하는 라세믹 에폭사이드의 고리 열림을 통하여 99%ee 이상을 나타낼 정도의 매우 높은 광학선택성을 보였다. 2분자형의 살렌 촉매는 단분자형의 촉매에 비하여 촉매량을 적게 첨가하여도 현저히 향상된 촉매활성을 나타내었다. 본 연구에서 적용한 촉매시스템은 키랄 에폭사이드 및 1,2-디올 중간체의 제조에 매우 효과적이었다

전이금속염 함유 키랄 살렌 촉매에 의한 광학선택적 에폭사이드의 합성 (Enantioselective Epoxide Synthesis on the Chiral Salen Catalyst having a Transitional Metal Salt)

  • 곽소봉;키테라 라올;김건중
    • Korean Chemical Engineering Research
    • /
    • 제46권4호
    • /
    • pp.769-776
    • /
    • 2008
  • 키랄성 말단기의 에폭사이드는 키랄중간체나 여러 출발물질로서 다양하게 이용되기 때문에 그 선택적인 합성법은 매우 유용하다. 본 연구에서는 염화코발트(II), 염화철(III) 및 질산아연(II)을 각각 함유한 키랄 코발트 살렌 촉매를 새로이 합성하고 그 특성을 평가하였다. 질량분석과 EXAF분석을 통하여 형성된 촉매 착체의 구조를 평가하였다. 합성한 촉매는 방향족 에폭사이드인 스타이렌 옥사이드와 페닐글리시딜 에테르의 속도차에 의한 비대칭 가수분해적 고리열림반응과 글리시틸부틸레이트의 합성반응에 적용하여 그 활성과 선택성을 조사하였다. 합성이 용이한 전이금속염함유 살렌착체 촉매는 물을 친핵체로 하는 라세믹 에폭사이드의 고리 열림을 통하여 99%ee 이상을 나타낼 정도의 매우 높은 광학선택성을 보였으며, 적은 양의 첨가로도 높은 활성을 보였다. 본 연구에서 적용한 촉매씨스템은 키랄 에폭사이드 및 1,2-디올 중간체의 제조에 매우 효과적이었다.

Separation of the Enantiomers of β-Blockers Using Brush Type Chiral Stationary Phase Derived from Conformationally Rigid α-Amino β-Lactam

  • Pirkle, William H.;Lee, Won-Jae
    • Bulletin of the Korean Chemical Society
    • /
    • 제31권3호
    • /
    • pp.620-623
    • /
    • 2010
  • A brush type chiral stationary phase (CSP 2) derived from ${\alpha}$-amino ${\beta}$-lactam was prepared for the separation of the enantiomers of ${\beta}$-blockers. Compared to the CSP derived from ${\alpha}$-amino phosphonate (CSP 1), in general, the conformationally rigid CSP 2 showed greater scope and much enhanced enantioselectivity for the resolution of ${\beta}$-blockers. The effect of various salt additives on enantioseparation of ${\beta}$-blockers in the mobile phase was investigated. The unusual effect of temperature on the chromatographic behaviors was observed on CSP 2. It also afforded appreciable increases in enantioselectivity without significantly affecting resolution, as the column temperature was reduced.