Diastereoselective Synthesis of Dimethyl (4R*,4a′R*,7a′R*)-1-Aryl-6′-benzoyl-4a′-methyl-5-oxo-1,4′,4a′,5,5′,6′-hexahydrospiro[pyrazole-4,7′-pyrrolo[3,4-c]pyridazine]-3′,7a′(1′Η)-dicarboxylates
作者:Branko Stanovnik、Uroš Uršič、Uroš Grošelj、Anton Meden、Jurij Svete
DOI:10.1055/s-0028-1083291
日期:2009.1
6′-hexahydrospiro[pyrazole-4,7′-pyrrolo[3,4-c]pyridazine]-3′,7a′(1′H)-dicarboxylates 12a-g. This represents a simple new pathway to novel heterocyclic systems. On the other hand, when (dimethylamino)propenoate 3 reacted with aniline hydrochloride (4), followed by the cycloaddition of 1,2,4,5-tetrazine 6, dimethyl (E)- and (Z)-4-(benzoyl[1-(methoxycarbonyl)-2-(phenylamino)vinyl]amino}methyl)-4-methyl-1,4-dihydropyridazine-3
甲基(Ž)-2-(苯甲酰基氨基)-3-(二甲基氨基)丙烯酸甲酯(1)配有trimethylenemethane(反应2),以产生甲基(ż)-2- [苯甲酰(2-甲基烯丙基)氨基] -3-(二甲基氨基)丙烯酸酯(3),然后通过将二甲基氨基与肼衍生物9a - h连续交换并环化成酯基,将其转化为吡唑衍生物11a - h。吡唑11a - g与1,2,4,5-四嗪3,6-二羧酸二甲酯的反应(6)导致非对映选择性形成1-芳基-6'-苯甲酰基-4a'-甲基-5-氧代-1,4',4a',5,5',6'-六氢螺[吡唑-4,7'-吡咯并[3,4 ç ]哒嗪] -3',7A'(1' ħ)-dicarboxylates 12A -克。这代表了通往新颖杂环系统的简单新途径。另一方面,当(二甲基氨基)丙酸酯3与苯胺盐酸盐(4)反应,然后将1,2,4,5-四嗪6,二甲基(E)-和(Z)-4-(苯甲酰基)环加成[1-(