Base-Catalyzed Intramolecular [4+2]-Cycloaddition of [3-Arylprop-2-yn-1-yl](3-phenylprop-2-en-1-yl)ammonium Bromides and Cleavage of the Cycloaddition Products in Aqueous Alkali
作者:E. O. Chukhajian、L. V. Ayrapetyan、K. G. Shahkhatuni、El. O. Chukhajian、H. S. Mkrtchyan、H. A. Panosyan
DOI:10.1134/s1070428019030072
日期:2019.3
group in the para position of the aromatic ring inhibits the process. 6-Bromo(or methyl)-4-phenyl-2,3,3a,4-tetrahydro-1H-benzo[f]isoindol-2-ium bromides undergo cleavage in aqueous alkaline medium at both N2-C3 and C1-N2 bonds, whereas cleavage of 6-methyl-4-phenyl-1,3,3a,4-tetrahydrospiro[benzo[f]isoindole-2,4′-morpholin]-2-ium bromide follows only the latter path. An accessible method has been developed
对[3-(4-溴(或甲基)苯基丙-2-炔-1-基](3-苯基丙-2-烯-1-基)溴化铵的分子内环化的研究表明,存在溴芳环对位的碳原子或甲基会抑制该过程6-溴(或甲基)-4-苯基-2,3,3a,4-四氢-1 H-苯并[ f ]异吲哚-2-基溴化物在碱性水溶液中同时在N 2 -C 3和C 1 -N 2键处裂解,而6-甲基-4-苯基-1,3,3a,4-四氢螺[苯并[ f]]异吲哚-2,4'-吗啉] -2-溴化铵仅遵循后一条路径。已开发出一种易于合成的方法,用于合成6-溴(或甲基)-4-苯基-2,3,3a,4-四氢-1 H-苯并[ f ]异吲哚-2-溴化物,异构体N- [ 7-溴-2(3)-甲基-1-苯基萘-3(2)-基甲基]哌啶和-吗啉及其7-甲基取代的类似物。