Chemoenzymatic synthesis of rengyoside -A, -B, isorengyoside and synthesis of their aglycones
摘要:
The chemoenzymatic synthesis of a group of naturally occurring cyclohexylethanoids, rengyoside-A, -B and isorengyoside, has been performed by enzymatic glucosidation of their chemically synthesized aglycones, rengyol, rengyoxide and isorengyol. (C) 1997 Published by Elsevier Science Ltd.
Chemoenzymatic synthesis of rengyoside -A, -B, isorengyoside and synthesis of their aglycones
摘要:
The chemoenzymatic synthesis of a group of naturally occurring cyclohexylethanoids, rengyoside-A, -B and isorengyoside, has been performed by enzymatic glucosidation of their chemically synthesized aglycones, rengyol, rengyoxide and isorengyol. (C) 1997 Published by Elsevier Science Ltd.
1,3-Diol Synthesis via Controlled, Radical-Mediated C−H Functionalization
作者:Ke Chen、Jeremy M. Richter、Phil S. Baran
DOI:10.1021/ja802491q
日期:2008.6.1
The invention of a method for the synthesis of 1,3-diols from the corresponding alcohols is described, via controlled, radical-mediated C-H functionalization. The sequence described herein entails near quantitative conversion to the corresponding trifluoroethyl carbamate, followed by a variant of the Hofmann-Löffler-Freytag reaction, cyclization, and hydrolysis to provide the 1,3-diols. In addition
METHOD FOR SEPARATING EIGHTEEN COMPONENTS IN TRADITIONAL CHINESE MEDICINE COMPOSITION
申请人:Shijiazhuang Yiling Pharmaceutical Co., Ltd.
公开号:EP3680248A1
公开(公告)日:2020-07-15
The invention belongs to the field of quality analysis and control of traditional Chinese medicine, and provides a method for separating eighteen components in a traditional Chinese medicine composition, comprising: (1) preparing the traditional Chinese medicine composition into a total extract of the traditional Chinese medicine composition, separating by resin through sequentially eluting with water, 10% ethanol and 30% ethanol, and collecting the 30% ethanol eluate to obtain a 30% ethanol extract; (2) adding the 30% ethanol extract to a reverse phase silica gel ODS-AQ-HG, and separating in a medium pressure separation column to obtain differently numbered elution dry pastes; (3) dissolving the differently numbered elution dry paste with 30% methanol as a solvent, and passing the solution through a 0.45 µm microporous membrane, carrying out a primary separation by high performance liquid chromatography and collecting chromatographic peaks with different retention times, and further purifying by high performance liquid chromatography; finally obtaining the components of eighteen components. The separation method of the present invention enables in-depth study of the chemical components of a pharmaceutical composition.
[EN] 1,3-DIOL SYNTHESIS VIA CONTROLLED, RADICAL-MEDIATED C-H FUNCTIONALIZATION<br/>[FR] SYNTHÈSE DE 1,3-DIOL PAR FONCTIONNALISATION CONTRÔLÉE DE C-H AVEC RADICAUX
申请人:SCRIPPS RESEARCH INST
公开号:WO2009137691A3
公开(公告)日:2009-12-23
Chemo enzymatic synthesis of Rengyol and Isorengyol
作者:Christoph Kobler、Franz Effenberger
DOI:10.1016/j.tet.2006.03.012
日期:2006.5
Cyanohydrins 2 of O-protected 4-hydroxycyclohexanones 1 are excellent starting compounds for the synthesis of Isorengyol (I) and Rengyol (II). The cyano group of the O-benzyl derivative 2d is first converted into the corresponding aldehyde 4, which via Wittig olefination led to the vinyl Compound 6. Hydroboration of the trans-derivative (trans-6) leads, after debenzylation, to Isorengyol, whereas hydroboration and debenzylation of the cis-isomer (cis-6) gives Rengyol. With hydroxynitrile lyases (HNLs) as catalysts the stereoselective preparation of cis- as well as trans-cyanohydrin 2d is possible, which enables the selective preparation of Isorengyol or Rengyol, respectively. The trans-con figuration of Isorengyol and the cis-configuration of Rengyol were secured by X-ray crystal structure analysis. (c) 2006 Elsevier Ltd. All rights reserved.