N-Cyanoacetylethylcarbamate → 2-[3,5-Dichloro-4-(5-isopropyl-6-oxo-1,6-dihydro-pyridazin-3-ylmethyl)-phenyl]-3,5-dioxo-2,3,4,5-tetrahydro-[1,2,4]triazine-6-carbonitrile

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This compound was prepared by a similar method to that described in Example 8, Step 2 except that (2-cyano-2-{[3,5-dichloro-4-(5-isopropyl-6-oxo-1,6-dihydro-pyridazin-3-ylmethyl)-phenyl]-hydrazono}-acetyl)-carbamic acid ethyl ester (47) was used in place of 2-cyano-2-{[3,5-dichloro-4-(5-isopropyl-6-oxo-1,6-dihydro-pyridazin-3-yloxy)-phenyl]-hydrazono}-acetyl)-carbamic acid ethyl ester (30) to afford 2-[3,5-dichloro-4-(5-isopropyl-6-oxo-1,6-dihydro-pyridazin-3-ylmethyl)-phenyl]-3,5-dioxo-2,3,4,5-tetrahydro-[1,2,4]triazine-6-carbonitrile (48) as an off-white solid (1.21 g, 39%); EI(+)-HRMS m/z calcd for C18H14Cl2N6O3 (M+H)1+ 433.0577, found 433.0577. Molecular Weight=433.2567; Exact Mass=432.0504

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