Vyacheslav Y. Sosnovskikh and Mikhail Y. Mel'nikov
The reactions of 3,3-dialkyl-6-trifluoromethyl-2,3-dihydro-4-pyrones with methyl and ethyl mercaptoacetates in the presence of piperidine result in the formation of 2-oxa-7-thiabicyclo[3.2.1]octane derivatives.