A number of 1-deaza-7,8-dihydropteridines with antimitotic activity have been prepared by the route shown in the scheme for NSC-350386 (1,2). Reaction of 2-aminopropiophenone oxime with ethyl 6-amino-4-chloro-5-nitropyridin-2-ylcarbamate (I) gave (II), which was hydrolyzed in a mixture of dioxane and hydrochloric acid to give the ketone (III). Reductive cyclization of (III) was effected with Raney Nickel and hydrogen.