It is shown that 2-allylatedanilines (cf. Schemes 2–4, 7, and 8) on irradiation in protic solvents such as H2O. MeOH, and EtOH in the presence of H2SO4 undergo a novel photosolvolysis reaction to yield specifically trans-2-hydroxy- and trans-2-alkoxy-1-methylindanes. Intermediates are presumably tricyclo[4.3.0.01,8]nona-2,4-dienes formed in an intramolecular [2s + 2s] cycloaddition reaction (cf. Scheme
结果表明,在质子传递溶剂(如H 2 O. MeOH和EtOH)中,在H 2 SO 4存在下,辐照2-烯丙基化的苯胺(参见方案2-4、7和8)经历了新的光解反应特别地产生反式-2-羟基和反式-2-烷氧基-1-甲基茚满。中间体大概是在分子内[2 s + 2 s ]环加成反应中形成的三环[4.3.0.0 1,8 ] nona-2,4-二烯(参见方案7)。另一方面,N,N,N-三甲基-2-(1'-甲基烯丙基)苯胺盐18(方案6)和2-(3'-丁烯基)-N,N-二甲基苯胺(17)在MeOH或H 2 SO 4 / MeOH中辐射后,铵基还原生成(1-甲基烯丙基)苯(19)和1-甲基茚满(20)。
Stereochemical Analysis of an Aromatic Triplet Di-?-methane Rearrangement
作者:Bernhard Scholl、Hans-J�Rgen Hansen
DOI:10.1002/hlca.19860690821
日期:1986.12.10
irradiation in MeCN at 20°, undergoes in its lowest-lying triplet state an aromatic di-π-methane (ADPM) rearrangement to yield (−)-(1′R,2′R)- and (+)-(1′R,2′S)-N,N-dimethyl-2-(2-methylcyclopropyl)aniline ((−)-trans- and (+)-cis-7) in an initial trans/cis ratio of 4.71 ± 0.14 and in optical yields of 28.8 ± 5.2% and 15 ± 5%, respectively. The ADPM rearrangement of (−)-(S)-4 to the trans- and cis-configurated