Synthesis of pyrrolo[1,2-a]indoles: vilsmeier formylation of some 3-methylindol-2-yl ketones and 3(3-methylindol-2-yl)propenoic ester
作者:Takawira C.-G. Kazembe、Deryck A. Taylor
DOI:10.1016/0040-4020(80)80102-5
日期:1980.1
latter case, 2-carbethoxy-1-chloro-3-dimethylamino-9-methyl-3H-pyrrolo[1,2-a]indole (9b) was isolated as an intermediate. The structure of the pyrroloindolylidene acetaldehydes was proved by synthesis of the chromophore from 4-acetyl-3-methyl-1-phenyl-pyrrole-2-carboxylate (26). The preparation and behaviour of 1-phenylpyrrole-2,4- and 3,4-dicarboxylates, monomethylated in the pyrrole ring, is described
3-甲基吲哚-2-基甲基酮与磷酰氯在二甲基甲酰胺中反应,得到3-氯-3(3-甲基吲哚-2-基),丙烯醛(4)。通过与3(3-甲基吲哚-2)的相同试剂反应生成2-Carbomethoxy-和2-carbethoxy-1-chloro-9H-pyrrolo [1,2-a] indol-9-次乙醛(10a和b)分别为(6- )丙烯酸酯(7)和3(3-甲基吲哚-2-基)-3-氧代丙酸酯(2)。在后一种情况下,分离出2-碳乙氧基-1-氯-3-二甲基氨基-9-甲基-3H-吡咯并[1,2-a]吲哚(9b)作为中间体。由4-乙酰基-3-甲基-1-苯基-吡咯-2-羧酸酯合成发色团证明了吡咯并二亚甲基乙醛的结构(26)。描述了在吡咯环中单甲基化的1-苯基吡咯-2,4-和3,4-二羧酸酯的制备和行为。这些化合物是在寻找令人满意的途径合成与10a和b有关的化合物的起始原料的过程中制备的。这样的二酯的皂化作用是显着