New 3-aryl-6-methylpyrimido[4,5-c]pyridazine-5,7(6H,8H)-diones and 3-aryl-6-ethyl-7-thioxo-7,8-dihydropyrimido[4,5-c]pyridazin-5(6H)-ones were efficiently synthesized via a regiospecific one-pot reaction of N-methylbarbituric acid and N-ethyl-2-thiobarbituric acid with various arylglyoxal monohydrates in the presence of hydrazine dihydrochloride in ethanol at 50 °C. The target compounds were obtained in high yields and were regioisomerically pure after recrystallization. These new heterocycles may act as potential MAO_B} inhibitors.
新型的3-芳基-6-
甲基吡啶并[4,5-c]
吡啶嗪-5,7(6H,8H)-二酮和3-芳基-6-乙基-7-
硫酮-7,8-
二氢吡啶并[4,5-c]
吡啶嗪-5(6H)-酮,通过N-甲基
巴比妥酸和N-乙基-2-
硫巴比妥酸与各种芳基
甘油醛一
水合物在
乙醇中50°C下,通过
盐酸肼作为催化剂的一锅法选择性反应高效合成。目标化合物在重结晶后得到高产率和纯的区域异构体。这些新型
杂环化合物可能作为潜在的MAO-B
抑制剂。