55456-55-8Relevant articles and documents
Selective Monodeoxygenation of Methyl 3-(2-Quinoxalinylmethylene)carbazate N1, N4-Dioxide (Carbadox)
Massy,McKillop
, p. 1477 - 1480 (1996)
The veterinary drug methyl 3-(2-quinoxalinylmethylene)carbazate N1, N4-dioxide (Carbadox) has been selectively reduced in good yield at either N1 or N4 with the reagents sodium dithionite or phosphorus trichloride, respectively. The identity of the products, which are important metabolites, was established by 1H NMR and by an X-ray crystal structure of the N1-monodeoxygenated product. The further metabolite, bis(desoxy) Carbadox, was prepared by reduction of Carbadox with a slight excess of sodium dithionite/ acetic acid. When a large excess of this reagent was used, a new compound, methyl 3-(2-quinoxalinylmethyl)carbazate, was also formed.