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■ Suggestion of Unexpected Sulfur Dioxide Mechanism for Deoxygenations of Pyridine N -Oxides with Alkanesulfonyl Chlorides and Triethylamine

Yoshiki Morimoto,* Hajime Kurihara, Takamasa Shoji, and Takamasa Kinoshita

*Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan

Abstract

The reaction mechanism for unusual deoxygenations of pyridine N-oxides with alkanesulfonyl chlorides and triethylamine was explored. Some experimental facts suggested that sulfur dioxide generated in the reaction system might be responsible for the deoxygenations without chlorinations of the pyridine nucleus.