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[reaction: see text] A Mg(0)/Me(3)SiCl system was found to be effective for the preparation of difluoro Danishefsky's dienes 2, which involves selective C-F bond cleavage of trifluoromethyl ketones 3. Subsequent hetero Diels-Alder reactions of 2 with aldehydes and imines gave a variety of fluorinated six-membered heterocycles.
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Amii et al. (2001) studied this question.
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