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CRISPR/Cas9 Editing of the C. elegans rbm-3.2 Gene using the dpy-10 Co-CRISPR Screening Marker and Assembled Ribonucleoprotein Complexes.

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Published on: December 11, 2020

Precision indole skeletal editing for single-carbon replacement.

Ling Zhang¹, Yatao Lang¹, Zhen Luo¹

¹The State Key Laboratory of Natural Product Chemistry, and the College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, P. R. China.

Science (New York, N.Y.)

|April 30, 2026

Summary

This summary is machine-generated.

Researchers developed a new photoreaction for indole synthesis, enabling regioselective C2 functionalization and carbon incorporation. This skeletal editing method is useful for creating complex molecules like quebrachamine.

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Area of Science:

Organic Chemistry
Synthetic Chemistry
Medicinal Chemistry

Background:

Indole scaffolds are prevalent in pharmaceuticals and natural products.
Efficient methods for functionalizing the indole C2 position are crucial for drug discovery and synthesis.

Purpose of the Study:

To develop a novel intramolecular skeletal editing reaction for indole derivatives.
To achieve regioselective C2 functionalization and carbon incorporation in indoles.

Main Methods:

Photoreaction of a pendant amide in tryptamine derivatives.
Density Functional Theory (DFT) calculations to elucidate reaction mechanisms.

Main Results:

Regioselective single-carbon replacement and substitution at the indole C2 position.
Facilitation of deuteration, alkylation, arylation, acylation, and 13C-labeling at C2.
Demonstrated applicability via a four-step total synthesis of quebrachamine.

Conclusions:

The developed photoreaction provides a versatile strategy for indole C2 functionalization.
The reaction mechanism involves a cascade of [2+2] cycloaddition, retro-[2+2] ring opening, decarbonylation, and cyclization.
This method offers a powerful tool for synthesizing complex indole-containing molecules.