作者:Prince Ravat、Rahel Hinkelmann、David Steinebrunner、Alessandro Prescimone、Ina Bodoky、Michal Juríček
DOI:10.1021/acs.orglett.7b01461
日期:2017.7.21
methyl groups was synthesized via photochemical and benzylic coupling route. Resolution of each compound into enantiomers and determination of the Gibbs activation energies of enantiomerization (ΔG⧧(T)) revealed high configurational stability in all three cases. The ΔG⧧(T) values of difunctionalized [5]helicenes were compared with those of their monofunctionalized analogues and the parent [5]helicene. Within
通过光化学和苄基偶联途径,合成了在峡湾区被氟,甲氧基或甲基基团双官能化的一系列[5]螺旋烯。各化合物进入对映体和判定enantiomerization(Δ的吉布斯活化能的分辨率ģ ⧧(Ť))揭示在所有三种情况下的高外形稳定性。将双官能化[5]螺旋烯的ΔG⧧(T)值与其单官能化类似物和母体[5]螺旋烯的ΔG compared(T)值进行了比较。在这一系列中,扭曲和Δ之间的指数相关性ģ ⧧(Ť) 被找到。在迄今为止报道的[ n ]螺旋烯中,二甲基衍生物表现出与[9]螺旋烯相当的最高构型稳定性之一。