Hydrazine → 1,4-Naphthalenedione, 5-amino-2,3-dimethoxy-

Reaktionsgleichung

NN.CC(C)(C)[CH2:5][O:6][C:7]1[C:8](=[O:27])[C:9]2[C:14]([C:15](=[O:23])[C:16]=1[O:17][CH2:18]C(C)(C)C)=[C:13]([N+:24]([O-])=O)[CH:12]=[CH:11][CH:10]=2>[Pd].C(O)C>[CH3:5][O:6][C:7]1[C:8](=[O:27])[C:9]2[C:14]([C:15](=[O:23])[C:16]=1[O:17][CH3:18])=[C:13]([NH2:24])[CH:12]=[CH:11][CH:10]=2

Komponenten

Versuchsvorschrift

Hydrazine (4.0 ml, 125 mmol of 97%) was added dropwise, over a 2 hour period, to a stirred mixture of the captioned compound of Preparation 2 (19.9 g, 75.6 mmol), 5% palladium on carbon (10 g) and ethanol (750 ml) in a nitrogen atmosphere. The catalyst was filtered off through a celite pad that was washed with hot ethanol (2×300 ml). The combined filtrate and washings were concentrated to dryness in vacuo and the residue recrystallized from water:ethanol (1.5:1) giving 14.6 g of 2,3-dimethoxy-5-amino-1,4-naphthoquinone, mp 116°-117°.