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  • Title: [Cyclic hydrazides. II. (1) Synthesis of 3-aminopyrazolo[1,2-b]hthalazine-1(1H),5(10 H)-diones].
    Author: Winters G, Di Mola N, Oppici E, Nathansohn G.
    Journal: Farmaco Sci; 1975 Aug; 30(08):620-30. PubMed ID: 1149874.
    Abstract:
    The synthesis is described of a number of 3-aminopyrazolo[1,2-b]phthalazine-1(1H),5(10H)-diones (I) differently substituted on the amino group and in position 2, through condensation of alpha-chloro-beta-chlorocarbonylenamines (IV) with the 3,4-dihydrophthalazin-1(2H)-one (III). Alternatively cyanoacetylchlorides are condensed with (III) giving directly the 3-aminopyrazolo[1,2-b]phthalazine-1(1H),5(10H)-diones with the primary amino function (VII).
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