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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
Published on: February 6, 2019
Synthesis of functionalized isoquinolines via sequential cyclization/cross-coupling reactions
1Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China.
Copper(II) chloride mediated cyclization of alkynylbenzaldehyde oximes efficiently produces 4-chloroisoquinolines. These intermediates are then functionalized using palladium-catalyzed cross-coupling reactions, yielding diverse isoquinoline derivatives.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Heterocyclic Chemistry
Background:
- Isoquinolines are a vital class of nitrogen-containing heterocycles with broad applications in medicinal chemistry and materials science.
- Developing efficient synthetic routes to functionalized isoquinolines remains a key objective in organic synthesis.
Purpose of the Study:
- To develop a novel copper(II) chloride-mediated synthetic strategy for the preparation of 4-chloroisoquinolines.
- To explore the subsequent functionalization of these 4-chloroisoquinolines via palladium-catalyzed cross-coupling reactions.
Main Methods:
- Cyclization of 2-alkynylbenzaldehyde O-methyl oximes using copper(II) chloride (CuCl2) in N,N-dimethylacetamide (DMA).
- Palladium-catalyzed Suzuki-Miyaura cross-coupling reactions with various arylboronic acids.
Main Results:
- The CuCl2-mediated cyclization provided 4-chloroisoquinolines in good yields.
- Subsequent palladium-catalyzed cross-coupling reactions successfully introduced diverse aryl substituents, affording a range of functionalized isoquinolines.
Conclusions:
- A facile and efficient method for synthesizing 4-chloroisoquinolines from readily available precursors has been established.
- The developed protocol offers a versatile platform for the construction of complex, functionalized isoquinoline scaffolds.
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