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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 10, 1980 - Issue 12
290
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Original Articles

Studies on a General Method for the Demethylation of Quaternized Nitrogen Heterocycles

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Pages 947-950 | Published online: 05 Dec 2006
 

Abstract

Probably the best general method so far developed for the dealkylation of quaternized nitrogen heterocycles is the reaction of the iodide salts in an aprotic solvent in the presence of triphenylphosphine.1,2 It has since been established3 that the iodide counterion is the active dealkylating agent, with the triphenylphosphine acting as a “methyl sponge”, preventing the reverse reaction from occurring. It follows, therefore, that any heterocycle (1) ought to be able to fulfil the same role as the triphenylphosphine with respect to the dealkylation of the quaternary salt of a less nucleophilic heterocycle (2). Since the reactivity to methylation of a large number of heterocycles with a reactivity range of ca 106 is known4, the choice of a convenient heterocycle (1) to go with any heterocycle (2) is, in principle, a wide one.

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