Oxidative Conversion of 3‐Alkoxyfurans to 2‐Hydroxy‐3(2<i>H</i>)‐furanones and 2‐Hydroxy‐2‐butene‐1,4‐diones with 2,3‐Dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) or Phenyltrimethylammonium Tribromide (PTAB) in <i>t</i>‐BuOH
作者:Shinsei Sayama
DOI:10.1080/00397910701543036
日期:2007.9.1
Abstract 2‐Alkoxy‐1,3,4‐triphenylfurans were oxidized to 3‐alkoxy‐2,4,5‐triphenyl‐ 2‐butene‐1,4‐diones with 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) in t‐BuOH. In contrast, various 3‐alkoxy‐2,4,5‐triphenylfurans were directly converted to 2‐hydroxy‐3(2H)‐furanone with phenyltrimethylammonium tribromide (PTAB) in t‐BuOH. The oxidative ring opening of 3‐alkoxy‐2,5‐diphenylfurans to cis‐2‐hydroxy‐2‐butene‐1
Oxidation of Furans with 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone(DDQ)
作者:Shinsei Sayama、Yutaka Inamura
DOI:10.3987/com-96-7456
日期:——
2,5-Disubstituted furans were oxidatively cleaved to 2-butene-1,4-diones with DDQ in CH2Cl2-DMSO. In particular, 3-alkoxy-2,5-diphenylfurans were selectively converted into cis-2-alkoxy-1,4-diphenyl-2-butene-1,4-diones with DDQ in CH2Cl2.
Convenient Transformation of 3-Alkoxyfurans to 2-Alkoxy-3-furanones or cis-2-Alkoxy-2-butene-1,4-diones with Phenyltrimethylammonium Tribromide
作者:Shinsei Sayama
DOI:10.3987/com-05-10366
日期:——
3-Alkoxy-2,5-diphenylfurans and 3-alkoxy-2,4,5-triphenylfurans were converted to 2-alkoxy-3-furanones with phenyltrimethylammonium tribromides(PTAB) in various alcohols at room temperature. The oxidative ring-opening of 3-alkoxy-2,5-diphenylfurans to cis-2-alkoxy-2-butene-1,4-diones was also accomplished with PTAB in DMSO.