in methanol; diethyl ether 10 h; Ambient temperature;

1: 63 percent / NaOH; acetic acid / 1 h / Heating 2: 89 percent / diethyl ether View Scheme

1: 62 percent / O-(2,4-dinitrophenyl)-hydroxylamine, n-butyllithium / tetrahydrofuran / Ambient temperature 2: 63 percent / NaOH; acetic acid / 1 h / Heating 3: 89 percent / diethyl ether View Scheme

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