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A novel catalytic system employing RuCl 3 / PPh 3 is described for the preparation of 2,3‐disubstituted pyridines starting from 3,4‐disubstituted isoxazol‐5‐ones and acrolein. Mechanistic studies involving 31 P NMR, HRMS analyses and control experiments have been performed in order to support key events and intermediates proposed for this transformation.
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Fernandes et al. (2019) studied this question.
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