The dihydroquinone derivatives of piperidine and piperazine are 7-piperazinyl and 7-piperadinyl-3,4-dihydroquinazolin-2(1H)-ones that exhibit D2 and 5-HT1A receptor binding affinities, making them suitable for use as the active ingredient of pharmaceuticals for the treatment of schizophrenia. The derivatives have the general formula:
where X is carbon or nitrogen and R is a group selected from a through f having the formula:
or a pharmaceutically acceptable salt thereof. The piperazine compounds are prepared by condensing 4-bromo-2-nitro-benzonitrile with 1-Boc-piperazine (1-tert-butoxycarbonyl-piperazine) to form an intermediate that is converted to a piperazinyl-3,4-dihydroquinazolin-2(1H)-one. Subsequent reductive amination with the biarylaldehydes a through f completes the synthesis of the 7-piperadinyl-3,4-dihydroquinazolin-2(1H)-ones. The piperadinyl compounds are prepared from tert-butyl-4-(2-oxo-1,2,3,4-tetradihydroquinazolin-7-yl)piperidine-1-carboxylate, which is converted to 7-(piperidin-4-yl)-3,4-dihyroquinazolin-2(1H)-one. Subsequent reductive amination with the biarylaldehydes a through f completes the synthesis of the 7-piperidinyl-3,4-dihydroquinazolin-2(1H)-ones.
哌啶和
哌嗪的二氢
喹啉衍
生物是7-
哌嗪基和7-
哌啶基-3,4-二氢
喹唑啉-2(1H)-酮,具有D2和5-HT1A受体结合亲和力,适用于作为治疗精神分裂症的药物的活性成分。该衍
生物具有以下通式:其中X是碳或氮,R是选择自a到f的具有以下式的基团:或其药学上可接受的盐。
哌嗪化合物通过将4-
溴-2-
硝基苯腈与1-Boc-
哌嗪(
1-叔丁氧羰基哌嗪)缩合形成中间体,该中间体转化为
哌嗪基-3,4-二氢
喹唑啉-2(1H)-酮。随后,与双芳基醛a到f的还原胺化反应完成了7-
哌啶基-3,4-二氢
喹唑啉-2(1H)-酮的合成。
哌啶化合物是从叔丁基-4-(2-氧代-1,2,3,4-四氢
喹唑啉-7-基)
哌啶-1-羧酸叔丁酯开始制备的,该化合物转化为7-(
哌啶-4-基)-3,4-二氢
喹唑啉-2(1H)-酮。随后,与双芳基醛a到f的还原胺化反应完成了7-
哌嗪基-3,4-二氢
喹唑啉-2(1H)-酮的合成。