process for the manufacture of methyl 3 - (2-quinoxalinylmethylene) carbazate n1, n4 dioxide.

摘要

1462424 Methyl 3-(2-quinoxalinylmethylene)- carbazate-NSP1/SP,NSP4/SP-dioxide PFIZER Inc 15 March 1974 [10 April 1973] 11706/74 Heading C2C The title compound is prepared by reacting a nitrone, acetal, oxime, semicarbazone or thiosemicarbazone derivative of 2-formylquinoxaline-1,4-dioxide with NH 2 NHCO 2 Me or a hydrazone derived therefrom, provided that only said hydrazone may be used for reaction with an acetyl. Reference has been directed by the Comptroller to Specification 1,058,047.