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Development of a Highly Enantioselective Catalytic Di-π-methane Rearrangement.

Samuel B Cahoon¹, Steven J Chapman¹, Tahoe A Fiala¹

¹Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States.

The Journal of Organic Chemistry

|November 18, 2024

Summary

This summary is machine-generated.

The di-π-methane rearrangement transforms organic compounds into vinyl cyclopropanes. A new dual chiral acid-iridium system achieves the first highly enantioselective catalytic all-carbon di-π-methane rearrangement.

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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

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Published on: February 7, 2019

Area of Science:

Organic Chemistry
Photochemistry
Catalysis

Background:

The di-π-methane (DPM) rearrangement is a key organic photorearrangement.
It converts 1,4-diene compounds to vinyl cyclopropanes, restructuring carbon frameworks.
Acid catalysis can influence DPM rearrangement pathways.

Purpose of the Study:

Investigate the impact of Lewis and Brønsted acids on DPM rearrangement.
Develop a catalytic system for highly enantioselective DPM rearrangement.
Explore the application of dual chiral acid-iridium systems.

Main Methods:

Studied the DPM rearrangement of dibenzobarrelenes.
Examined the effects of various Lewis and Brønsted acids.
Developed and tested a dual chiral Brønsted acid-iridium photosensitizer system.

Main Results:

Identified a dual chiral Brønsted acid-iridium photosensitizer system.
Achieved the first highly enantioselective catalytic all-carbon DPM rearrangement.
Demonstrated significant carbon framework restructuring via DPM rearrangement.

Conclusions:

The developed system enables highly enantioselective DPM rearrangement.
Dual chiral acid-iridium catalysis offers a powerful tool for organic synthesis.
This advancement provides synthetically valuable restructuring of substrates.