Cyclization of dialkylpropyn-1-yl(allyl)(3-isopropenylpropyn-2-yl)ammonium bromides and water-base cleavage of 2,2-dialkyl-5-methyl-2,6,7,7<i>a</i>-tetrahydro-1<i>h</i>-isoindolium and 2,2-dialkyl-5-methylisoindolinium bromides
作者:Emma H. Chukhajian、Martiros K. Nalbandyan、Hasmik R. Gevorkyan、Eliza H. Chukhajian、Henrik A. Panosyan、Armen G. Ayvazyan、Rafael A. Tamazyan
DOI:10.1002/jhet.5570450309
日期:2008.5
yn-2-yl)ammonium bromides under base-catalyzed condition instantly undergo intramolecular cyclization. The cyclization of dialkylpropyn-1-yl(3-isopropenylpropyn-2-yl)ammonium bromides leads to the formation of 2,2-dialkyl-5-methylisoindolinium salts. In case of allyl analogs, instead of the expected 2,2-dialkyl-6-methyl-3a,4-dihydroisoindolinium salts their isomeric forms - 2,2-dialkyl-5-methyl-2,6
在碱催化条件下,二烷基丙炔-1-基(或烯丙基)(3-异丙烯基丙炔-2-基)溴化铵立即经历分子内环化。二烷基丙炔-1-基(3-异丙烯基丙炔-2-基)溴化铵的环化导致形成2,2-二烷基-5-甲基异吲哚鎓盐。在烯丙基类似物,而不是预期的2,2-二烷基-6-甲基- 3的情况下一个,4- dihydroisoindolinium盐及其异构体形式- 2,2-二烷基-5-甲基2,6,7,7一-获得四氢-1 H-异吲哚溴化物。在碱性介质中,它们被转化为二氢异吲哚鎓盐,其在两个方向(1,2,1,6)上的裂解导致异构的二烷基-1,4-二甲基-和2,4-二甲基苄基胺的混合物。