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Stereoselective oxidation of optically active dihydropyridines with NOBF4 or MnO2 leads with either inversion or retention to axial chiral arylpyridines (see below), which can be converted by cathodic reduction into the corresponding dihydropyridines. This is the first report of the successful inversion of configuration or dihydropyridines.
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Straub et al. (1996) studied this question.
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