Pummerer Synthesis of Chromanes Reveals a Competition between Cyclization and Reductive Chlorination
Organic Letters(2019)
Abstract
The competition between an unprecedented reductive chlorination and the Pummerer reaction was studied and applied to the synthesis of benzofused oxygen heterocycles including 3-aminochromanes and in the intramolecular chlorination of activated aromatic rings. The use of (COCl)2 as a Pummerer activator showed substantial activity, producing α-chlorinated sulfides that can undergo Pummerer–Friedel–Crafts cyclization. If the aromatic ring has electron-donating groups in position three, then the reaction follows a different pathway, yielding the reductive chlorination products, where the chlorine atom comes from a sulfonium salt.
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Key words
reductive chlorination,chromanes,cyclization,synthesis
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