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Related Concept Videos

Prochirality02:05

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Cholinergic antagonists bind to cholinergic receptors and limit the effects of acetylcholine and other cholinergic agonists. Based on the specific cholinergic receptor affinity, these antagonists are classified as muscarinic or nicotinic. Anticholinergics interrupt parasympathetic innervations while sympathetic innervations remain uninterrupted. Muscarinic antagonists are also called 'muscarinic antagonists', 'antimuscarinics', or 'parasympatholytics'. Nicotinic antagonists are called...
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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
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Direct-acting cholinergic agonists, such as synthetic choline esters and naturally occurring alkaloids, exert their effects by enhancing the actions of acetylcholine and stimulating the parasympathetic nervous system. Synthetic choline esters share structural similarities with acetylcholine. For example, they have a positively charged quaternary ammonium or onium group, contributing to their hydrophilic characteristics. As a result, they are poorly absorbed in the body through oral...
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Related Experiment Video

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Applications of Liquid-Chromatography Tandem Mass Spectrometry in Natural Products Research: Tropane Alkaloids as a Case Study
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Total synthesis of (-)-chamobtusin A.

Hikaru Suzuki1, Sakae Aoyagi

  • 1School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Horinouchi, Hachioji, Tokyo 192-0392, Japan.

Organic Letters
|December 4, 2012
PubMed
Summary

The first asymmetric total synthesis of chamobtusin A was achieved. This study introduces novel methods for aziridine formation and palladium-catalyzed annulation, advancing alkaloid synthesis.

Area of Science:

  • Organic Chemistry
  • Natural Product Synthesis

Background:

  • Alkaloids are a diverse class of nitrogen-containing natural products with significant biological activities.
  • Chamobtusin A is a structurally unique alkaloid whose total synthesis has not been previously reported.

Purpose of the Study:

  • To achieve the first asymmetric total synthesis of chamobtusin A.
  • To develop novel synthetic methodologies applicable to complex alkaloid structures.

Main Methods:

  • Asymmetric synthesis utilizing a novel aziridine formation from a 1,2-oxazine derivative.
  • Palladium-catalyzed annulation of a vinylaziridine intermediate.

Main Results:

  • Successful construction of the complex carbon skeleton of chamobtusin A.

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  • Demonstration of a novel aziridine formation strategy.
  • Efficient palladium-mediated annulation for constructing the target molecule.

    • Conclusions:

    • The first asymmetric total synthesis of chamobtusin A has been accomplished.
    • The developed synthetic route showcases innovative aziridine chemistry and palladium catalysis.
    • This work provides a foundation for the synthesis of related alkaloid natural products.