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Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes
Published on: December 16, 2019
Highly functionalized benzene syntheses by directed mono or multiple magnesiations with TMPMgCl.LiCl
Wenwei Lin1, Oliver Baron, Paul Knochel
1Department Chemie und Biochemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377 München, Germany.
Direct magnesiation of functionalized aromatics is achieved using an OBoc directing group and TMPMgCl.LiCl base. This method enables the synthesis of highly substituted benzene derivatives with excellent yields.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- Direct functionalization of aromatic compounds is crucial in organic synthesis.
- Existing methods often require harsh conditions or lack regioselectivity for complex substrates.
Purpose of the Study:
- To develop a novel method for the direct magnesiation of highly functionalized aromatic compounds.
- To utilize an ortho-alkoxycarbonyl (OBoc) group as a directing element for regioselective magnesiation.
Main Methods:
- Employing an OBoc group as a directing group on aromatic substrates.
- Utilizing TMPMgCl·LiCl (2,2,6,6-tetramethylpiperidinylmagnesium chloride lithium chloride complex) as a strong, non-nucleophilic base.
- Quenching the intermediate magnesiated species with electrophiles.
Main Results:
- Successful direct magnesiation of aromatics containing ester, nitrile, or ketone functionalities.
- High yield (>95%) preparation of meta-magnesiated benzophenone derivatives.
- Access to a range of highly functionalized and substituted benzene compounds after electrophilic quench.
Conclusions:
- The OBoc-directed magnesiation offers a facile and efficient route to complex aromatic structures.
- This methodology expands the synthetic utility of organomagnesium reagents in the presence of sensitive functional groups.
- Provides a powerful tool for constructing highly substituted aromatic building blocks for further chemical transformations.
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