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Published on: June 21, 2017
Asymmetric Reduction of Unactivated Alkenes
Nico D Fessner1, Sebastian Roth1, Richard Niese1
1Pharmaceutical and Medicinal Chemistry, Institute of Pharmaceutical Sciences, University of Freiburg, Freiburg, Germany.
Asymmetric reduction of unactivated alkenes is challenging. Recent advances integrate chemical and biocatalytic strategies, including engineered enzymes and radical-based mechanisms, for more sustainable and selective synthesis.
Area of Science:
- Organic Chemistry
- Catalysis
- Biocatalysis
Background:
- Asymmetric reduction of unactivated alkenes is synthetically challenging due to low polarity and steric bias.
- Traditional methods involve precious metal catalysts (Ir, Ru) or radical hydrogen atom transfer (HAT).
- Trends focus on sustainability, cost-effectiveness, and operational simplicity.
Purpose of the Study:
- To summarize recent developments in the asymmetric reduction of unactivated alkenes.
- To highlight the integration of chemical and enzymatic strategies.
- To discuss the potential of biocatalysis for this transformation.
Main Methods:
- Review of catalytic hydrogenation with precious and abundant metals.
- Analysis of radical-mediated hydrogen atom transfer (HAT) approaches.
- Exploration of advancements in biocatalysis, including engineered enzymes and photobiocatalysis.
Main Results:
- Diverse mechanistic toolbox developed, with strategies tailored to specific substrates and conditions.
- Emerging trends favor sustainable, cost-effective, and simpler processes.
- Biocatalysis shows promise, with innovations like BioHAT integrating radical mechanisms into proteins.
Conclusions:
- Enzymatic reduction of unactivated alkenes remains challenging but is advancing.
- Synergistic integration of chemical and enzymatic methods offers new possibilities.
- Further development is needed for general and practical biocatalytic solutions for unactivated alkenes.
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