ChemInform Abstract: Mesityllithium as a Reagent for Chemoselective Halogen—Lithium Exchange Reaction.
Abstract
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ChemInform Abstract
Mesityllithium is found to be an excellent lithiating agent for haloaromatics bearing alkoxycarbonyl groups to give chemoselectively aryllithiums which are further react with carbonyl compounds to give products (III), (V) and (VII), or undergo intramolecular 1,2-additions to give lactones (XI) and (XIII), the latter compound is a precursor for the camptothecin alkaloid.
