申请人:King Fahd University of Petroleum and Minerals
公开号:US08916704B1
公开(公告)日:2014-12-23
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-piperazinyl-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,使它们适合用作治疗精神分裂症的药物的活性成分。这些衍生物具有一般公式:其中X是碳或氮,R是从a到f的具有以下结构的基团:或其药用可接受的盐。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)缩合制备,形成一个中间体,该中间体转化为哌嗪基-3,4-二氢喹唑啉-2(1H)-酮。随后与二芳基醛a至f进行还原胺化反应,完成了7-哌嗪基-3,4-二氢喹唑啉-2(1H)-酮的合成。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-羧酸酯制备的,将其转化为7-(哌啶-4-基)-3,4-二羟喹唑啉-2(1H)-酮。随后与二芳基醛a至f进行还原胺化反应,完成了7-哌啶基-3,4-二氢喹唑啉-2(1H)-酮的合成。