Fe(II)-mediated fragmentation of 1,4-diaryl-2,3-dioxabicyclo[2.2.2]octanes through competitive single electron transfer pathway and Lewis acid pathway
作者:Masaki Kamata、Takashi Kudoh、Jun-ichi Kaneko、Hye-Sook Kim、Yusuke Wataya
DOI:10.1016/s0040-4039(01)02201-8
日期:2002.1
1]heptanes 3a–d. On the other hand, 4-aryl-3-cyclohexenones 4c–d and p-substituted phenols 5c–d were obtained in the reactions of 1c–d with FeBr2 in CH2Cl2. A new fragmentation mechanism involving an electrophilic oxyl radical 1,5-substitution and a nucleophilic O-1,2-aryl shift is proposed based on the product analysis. In addition, the in vitro antimalarial activities of 1a–d were tested.
1,4-二芳基-2,3-二氧杂双环[2.2.2]辛烷的反应1A - d(1A Ar为:p -FC 6 ħ 4,1B:Ar为PH,1C:Ar为p -MeC 6 ħ 4,1D:Ar为p -MeOC 6 ħ 4)与FeBr 2的THF溶液,得到1,4- diarylbutan -1,4-二酮2A - d和1,4-二芳基-7-氧杂双环〔2.2.1〕庚烷3a中- d。另一方面,4-芳基-3-环己烯酮4c – d1c - d与FeBr 2在CH 2 Cl 2中的反应制得了对位酚5c - d和对位酚。在产物分析的基础上,提出了一种新的涉及亲电子羟基1,5-取代和亲核O -1,2-芳基移位的断裂机理。此外,还测试了1a - d的体外抗疟活性。