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Updated: May 31, 2026

Facile Preparation of 4-Substituted Quinazoline Derivatives
Published on: February 15, 2016
Mechanochemical Single-Carbon Insertion into (Iso)quinolines
Chunxiu Jing1, Fanchen Huang1, Xiaotong Liang1
1Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an, 710069, China.
Researchers developed a new mechanochemical method to convert (iso)quinolines into benzoazepines. This efficient skeletal editing technique offers a valuable route to diverse benzoazepine drug candidates under mild conditions.
Area of Science:
- Organic Chemistry
- Medicinal Chemistry
- Synthetic Chemistry
Background:
- (Iso)quinolines are prevalent scaffolds in FDA-approved drugs.
- Benzoazepines are underrepresented in drug discovery due to limited synthetic accessibility.
- Efficient methods for benzoazepine synthesis are highly desirable.
Purpose of the Study:
- To develop an efficient protocol for converting (iso)quinolines into benzoazepines.
- To explore the utility of mechanochemical skeletal editing for carbon-atom insertion.
- To demonstrate the application of this method to pharmaceutically relevant compounds.
Main Methods:
- Mechanochemical skeletal editing via carbon-atom insertion into (iso)quinolines.
- Ambient reaction conditions, avoiding metal additives, bulk solvent, and pre-activation.
- Investigation of substrate scope and reaction mechanism.
- Photochemical cycloaddition of benzoazepines and subsequent de-carbonylation.
Main Results:
- Successful conversion of (iso)quinolines to benzoazepines using a user-friendly mechanochemical protocol.
- The reaction proceeds efficiently under mild, solvent-free conditions.
- Demonstrated light-induced cycloaddition of benzoazepines to cyclobutene-fused indolines.
- Conversion of indolines to indoles via selective de-carbonylation.
Conclusions:
- A novel and efficient mechanochemical method for synthesizing benzoazepines from (iso)quinolines has been established.
- This skeletal editing approach provides access to diverse benzoazepine structures.
- The protocol's utility is validated through its application to pharmaceutically relevant (iso)quinolines and further transformations.
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