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High-yield selective synthesis of specific molecules - Organic Intermediates - China Sweet Wormwood by fdhjkl rfghjtkl
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High-yield selective synthesis of specific molecules - Organic Intermediates - China Sweet Wormwood by FDHJKL RFGHJTKL
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| Article Posted: 10/12/2013 |
| Article Views: 264 |
| Articles Written: 2148 - MORE ARTICLES FROM THIS AUTHOR |
| Word Count: 347 |
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High-yield selective synthesis of specific molecules - Organic Intermediates - China Sweet Wormwood |
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Although chemistry has advanced tremendously, one sticky issue inobtaining pure products is the existence of two different forms ofthe same molecule, enantiomers that are non-superimposable mirrorimages of each other. The small difference in position of certain atoms can play a critical role in functionality and generally only oneof the two is desired for a given purpose. Asymmetric synthesis, enantioselective synthesis and chiralsynthesis all refer to the selective production of only one of twoenantiomers. It is a very important chemical reaction type andorganic chemists constantly seek new methods in order to achieve itwith specific molecules . European researchers supported by funding of the ‘Asymmetric Brønsted acidcatalysed cyclisation reactions’ (Abaccr) project set out todevelop such mechanisms to selectively produce a class ofcompounds, azabicyclic structures, from readily available startingmaterials.
This is particularly important for the treatment ofdiseases. Researchers sought to explore enantiomer-selective reactionsproducing ring structures (cyclisation reactions) by exploiting thehigh reactivity of nitrogen acyl (N-acyl) iminium ions in a chiralacid-base solution (Brønsted hyaluronic acid (HA) and itsconjugate base). Organic intermediates play an important role in synthetictransformations but their high reactivity can make them difficultto control. Brønsted HA, a chiral catalyst, applied in asolution of starting material results in formation of highlyreactive N-acyl iminium ions that pair with the chiral conjugatebase of HA. This pairing of the intermediates enables highlyenantioselective irreversible cyclization.
Scientists successfully carried out the reaction and demonstratedthat it could be extended to a wide range of substrates (startingmaterials). They further investigated a two-catalyst method forproducing Beta-carboline compounds that could have important impact on numerous asymmetric catalysismethods employing binol phosphoric acids. Overall, the Abaccr project team contributed a variety of highlyselective asymmetric catalysed cyclisation synthesis reactions ofcommercial importance in drug therapies .
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