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Sharpless Epoxidation

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The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
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Crystallization-induced dynamic resolution R-epimer from 25-OCH3-PPD epimeric mixture.

Sainan Zhang1, Yun Tang2, Jiaqing Cao3

  • 1School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, China.

Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
|October 23, 2015
PubMed
Summary

This study developed a rapid crystallization-induced dynamic resolution (CIDR) process to efficiently separate the potent anti-cancer compound 25(R)-OCH3-PPD from its epimeric mixture, achieving high purity and yield for potential large-scale production.

Keywords:
25-OCH(3)-PPD epimeric mixtureAnticancer activityCrystallization-induced dynamic resolutionHPLC-ELSDSeparation and quantitation

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Area of Science:

  • Natural Products Chemistry
  • Pharmacognosy
  • Organic Chemistry

Background:

  • 25-OCH3-PPD, a dammarane sapogenin from Panax species, exhibits promising antitumor activity.
  • The R-epimer, 25(R)-OCH3-PPD, demonstrates superior anti-cancer potency compared to its S-epimer and the epimeric mixture.
  • Efficient separation of 25(R)-OCH3-PPD is crucial for its therapeutic development.

Purpose of the Study:

  • To develop a rapid and scalable purification process for 25(R)-OCH3-PPD.
  • To optimize the crystallization-induced dynamic resolution (CIDR) for separating 25(R)-OCH3-PPD from its epimeric mixture.
  • To establish a validated analytical method for quantifying the epimeric mixture and the purified product.

Main Methods:

  • Optimization of the CIDR process using single factor analysis and orthogonal design experiments (OA9).
  • Development and validation of a sensitive RP-HPLC method with ELSD detection for epimer quantification.
  • Application of the optimized CIDR conditions (3mL 95% ethanol, 8% HCl, 72h, sealed environment) for purification.

Main Results:

  • The optimized CIDR process achieved a maximum production of 25(R)-OCH3-PPD with 97% chemical purity and 87% total yield.
  • Nearly complete separation of 25(R)-OCH3-PPD from a 220mg epimeric mixture was accomplished.
  • A validated HPLC-ELSD method enabled accurate quantification of the epimers.

Conclusions:

  • A simple, steady, and scalable small-batch purification process for 25(R)-OCH3-PPD was successfully developed using CIDR.
  • This method provides an efficient route for obtaining highly pure 25(R)-OCH3-PPD from its epimeric mixture.
  • The findings support the potential for large-scale production of this potent anti-cancer compound.