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[reaction: see text] 8-Aza-5,7-dimethyl-2-trifluoromethylchromone reacts with alkyl mercaptoacetates to give pyrido derivatives of 2-oxa-7-thiabicyclo[3.2.1]octane, which undergo the reductive ring-opening to sulfanyl acetates. The latter compounds are useful CF(3)-containing building blocks for the preparation of a variety of 2-pyridone derivatives.
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Sosnovskikh et al. (2003) studied this question.
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