A Versatile Synthesis of α-Keto (cyanomethylene)triphenylphosphorane Ylides from Alkyl Halides Utilizing a Noble Phenylsulfonyl Reagent
作者:Kieseung Lee、Chan-Yeon Hwang
DOI:10.5012/bkcs.2013.34.10.2953
日期:2013.10.20
A noble phenylsulfonyl reagent 8 having -oxo (cyanomethylene)triphenylphosphorane ylide subunit readily condensed with various alkyl halides under basic conditions to afford -alkyl--oxo--phenylsulfonyl (cyanomethylene)triphenylphosphorane ylides 9 in excellent yields. These sulfonyl ylides 9 were then reductively desulfonylated with in the presence of methanol to provide -keto (cyanomethylene)-triphenylphosphorane
具有-氧代(氰亚甲基)三苯基正膦叶立德亚单元的贵苯磺酰基试剂8在碱性条件下容易与各种烷基卤化物缩合,以优异的收率得到-烷基-氧代-苯基磺酰基(氰基亚甲基)三苯基正膦叶立德9。然后在甲醇存在下将这些磺酰叶立德9还原去磺酰化以良好至极好的产率提供-酮基(氰基亚甲基)-三苯基正膦叶立德2'。我们的新合成方法利用一种新的苯磺酰基试剂作为关键试剂,在温和的反应条件下以良好的总产率从卤代烷中快速获得各种-酮(氰亚甲基)三苯基正膦叶立德。