Free-radical oxidation of para-substituted phenols by hypervalent tert-butylperoxyiodane and tert-butyl hydroperoxide: Synthesis of 4-(tert-butylperoxy)-2,5-cyclohexadien-1-ones
作者:Masahito Ochiai、Akinobu Nakanishi、Akiko Yamada
DOI:10.1016/s0040-4039(97)00781-8
日期:1997.6
Oxidation of 4-alkylphenols 1 by 1-(tert-butylperoxy)-1,2-benziodoxol-3(1H)-one (2) in the presence of tert-butyl hydroperoxide affords selectively 4-(tert-butylperoxy)-2,5-cyclohexadien-1-ones 3 in good yields. Evidence for the involvement of free-radicals is reported.
Direct Access to 1,4-Dihydroxyanthraquinones: The Hauser Annulation Reexamined with <i>p</i>-Quinones
作者:Dipakranjan Mal、Sutapa Ray、Indrajeet Sharma
DOI:10.1021/jo062271j
日期:2007.6.1
3-Phenylsulfanylphthalides (e.g. 8a) readily react with p-benzoquinones in the presence of (LiOBu)-Bu-t in THF to furnish 1,4-dihydroxyanthraquinones in good yields and one-pot operations.