Reaction of 5, 8-dimorpholino-2-phenylpyrimido [4, 5-d] pyridazine (I) with Grignard reagent or organolithium afforded 4-substituted-3, 4-dihydro derivatives (II). The use of an excess of the reagent gave rise to further substitution at 8-position to afford 4, 8-disubstituted-3, 4-dihydro derivatives (III and VII). Similar results were observed in the reaction of Grignard reagents with analogous tetraazanaphthalene derivatives, 5, 8-dimorpholino-2-phenylpyrimido [4, 5-d] pyrimidine (XX) and 5, 8-dimorpholino-2-phenyl-pyrazino [2, 3-d] pyridazine (XXII), to afford 4-substituted-3, 4-dihydro derivatives (XXI) and 3-substituted-3, 4-dihydro derivatives (XXIII), respectively. Among the obtained derivatives, IIa and IIj exhibited significant diuretic activity.
                                    5,8-二吗啉基-2-
苯基嘧啶并[4,5-d]
哒嗪(I)与
格氏试剂或
有机锂反应,得到 4-取代-3,4-二氢衍
生物(II)。使用过量的试剂可进一步取代 8 位,得到 4,8-二取代-3,4-二氢衍
生物(III 和 VII)。
格氏试剂与类似的四氮杂
萘衍
生物--5,8-二吗啉基-2-
苯基嘧啶并[4,5-d]
嘧啶(XX)和 5,8-二吗啉基-
2-苯基吡嗪并[2,3-d]
哒嗪(XXII)反应,也观察到了类似的结果,分别得到了 4-取代的-3,4-二氢衍
生物(XXI)和 3-取代的-3,4-二氢衍
生物(XXIII)。在获得的衍
生物中,IIa 和 IIj 具有显著的利尿活性。