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Planar Chirality Directs Enantiospecific Diastereoselectivity in Isocyanide-Based Multicomponent Reactions
Michael Kapsalis1, Michael Fragkiadakis1, Iakovos Konstantaras1
1Chemistry Department, University of Crete, Voutes, 70013 Heraklion, Greece.
Planar chirality in [2.2]-paracyclophane scaffolds provides predictable stereochemical control in isocyanide-based multicomponent reactions. This substrate-controlled approach achieves enantiospecific transfer without external chiral catalysts.
Area of Science:
- Organic Chemistry
- Stereochemistry
- Asymmetric Synthesis
Background:
- Stereochemical control in isocyanide-based multicomponent reactions (IMCRs) is a significant challenge.
- Substrate-controlled variants often lack predictable stereochemical outcomes.
Purpose of the Study:
- To investigate the use of planar chirality in [2.2]-paracyclophane scaffolds for stereochemical control in IMCRs.
- To demonstrate enantiospecific stereochemical transfer in Passerini and Ugi reactions.
Main Methods:
- Utilizing planar-chiral [2.2]-paracyclophane scaffolds as substrates.
- Performing Passerini three-component reactions and Ugi four-component/Ugi-tetrazole reactions.
- Analyzing stereochemical outcomes and diastereocontrol across numerous reaction variants.
Main Results:
- Planar chirality enabled predictable enantiospecific stereochemical transfer.
- Consistent diastereocontrol was achieved across over 65 reactions.
- No external chiral catalysts were required for stereochemical induction.
Conclusions:
- Planar chirality is a viable substrate-encoded principle for stereochemical control in IMCRs.
- This strategy expands enantiospecific multicomponent synthesis beyond point chirality.
- The findings offer a new route for asymmetric synthesis using readily available chiral scaffolds.
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