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Synthesis of the 2-oxo-N-phenyl-2-(5-phenylisoxazol-3-yl)acetohydrazonoyl cyanide analogues 7–27. Reagents and conditions: (a) CH3CN, MeLi, THF, -78 °C; or CH3CN, NaH, THF, 50 °C; (b) 2 N HCl, NaNO2, H2O, 0 °C; (c) 4a–f, NaOAc, EtOH, 14–81% for three steps.
