Reaction of Hexachloroacetone with Activated Acetylenes in the Presence of <i>N</i>-Heterocycles. Synthesis of Trichloromethylated Bridgehead <i>N</i>-Heterocycles
作者:Issa Yavari、Maryam Sabbaghan、Zinatossadat Hossaini
DOI:10.1055/s-2006-950429
日期:2006.9
Pyridine reacts smoothly with hexachloroacetone (HCA) in the presence of dialkyl acetylenedicarboxylates or dibenzoylacetylene to produce indolizines. Under similar conditions, isoquinoline led to oxazino[2,3-a]isoquinolines and/or pyrrolo[2,1-a]isoquinolines. Dimethyl 3,3-bis(trichloromethyl)-3H,4aH-[1,3]oxazino[2,3-a]quinoline-1,2-dicarboxylate or dimethyl 1-methyl-7-(2,2,2-trichloroacetyl)-1H-pyrrolo[1,2-a]imidazole-5,6-dicarboxylate was obtained from the reaction of quinoline or N-methylimidazole with dimethyl acetylenedicarboxylate in the presence of HCA.
在乙炔二甲酸二烷基酯或二苯甲酰乙炔存在下,吡啶与六氯丙酮(HCA)顺利反应生成中氮茚。在类似条件下,异喹啉产生恶嗪并[2,3-a]异喹啉和/或吡咯并[2,1-a]异喹啉。 3,3-双(三氯甲基)-3H,4aH-[1,3]恶嗪基[2,3-a]喹啉-1,2-二甲酸二甲酯或1-甲基-7-(2,2,2-三氯乙酰基)二甲酯)-1H-吡咯并[1,2-a]咪唑-5,6-二甲酸由喹啉或N-甲基咪唑与乙炔二甲酸二甲酯在HCA存在下反应得到。