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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Iridium-catalyzed enantioselective allyl-alkene coupling.

James Y Hamilton1, David Sarlah, Erick M Carreira

  • 1Eidgenössische Technische Hochschule Zürich , HCI H335, 8093 Zürich, Switzerland.

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|February 14, 2014
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Summary

This study introduces a novel iridium-catalyzed cross-coupling reaction for synthesizing complex dienes and trienes from allylic alcohols and olefins. The efficient method achieves high selectivity and enantioselectivity, enabling drug synthesis.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Asymmetric Synthesis

Background:

  • Allylic alcohols and olefins are versatile building blocks in organic synthesis.
  • Developing efficient catalytic methods for C-C bond formation is crucial for complex molecule synthesis.

Purpose of the Study:

  • To develop a direct iridium-catalyzed cross-coupling reaction between branched, racemic allylic alcohols and simple olefins.
  • To achieve high site selectivity and enantioselectivity in the cross-coupling transformation.

Main Methods:

  • Utilized an iridium-(P,olefin) complex as the catalyst.
  • Employed branched, racemic allylic alcohols and simple olefins as substrates.
  • Optimized reaction conditions for efficient coupling.

Main Results:

  • Successfully demonstrated the direct Ir-catalyzed cross-coupling reaction.
  • Achieved high site selectivity and excellent enantioselectivity in the formation of 1,5-dienes and trienes.
  • The method provided rapid access to diverse diene and triene structures.

Conclusions:

  • The developed Ir-catalyzed cross-coupling is a powerful tool for synthesizing 1,5-dienes and trienes.
  • This methodology was successfully applied to the catalytic asymmetric synthesis of JNJ-40418677, a γ-secretase modulator.