Ring-closing metathesis for the synthesis of substituted indenols, indenones, indanones and indenes: Tandem RCM-dehydrogenative oxidation and RCM-formal redox isomerization
作者:E. Mabel Coyanis、Jenny-Lee Panayides、Manuel A. Fernandes、Charles B. de Koning、Willem A.L. van Otterlo
DOI:10.1016/j.jorganchem.2006.08.074
日期:2006.12
temperature and catalyst loadings) for the metathesis reactions resulted in the formation of substituted indenones, formed by a tandem RCM-dehydrogenative oxidation in the absence of a hydrogen acceptor. Further manipulations of the reaction conditions generated two substituted indanones by way of a tandem RCM-formal redox isomerization sequence. Finally the synthesis of some substituted indenes was accomplished
使用钌介导的闭环复分解(RCM)和Grubbs第二代催化剂作为关键步骤,已经合成了许多取代的茚基。所需的二烯通过两种策略合成。第一种方法是使用[RuClH(CO)(PPh 3)3将2-烯丙基-3-异丙氧基-4-甲氧基苯甲醛异构化为其苯乙烯衍生物异丙氧基-4-甲氧基-2-丙烯基苯甲醛]。然后将该化合物和3-异丙氧基-4-甲氧基-2-(1-苯基丙烯基)-苯甲醛用乙烯基-或异丙烯基-溴化镁处理,得到复分解所需的四个支架。由于化合物3-异丙氧基-4-甲氧基-2-(1-甲基-2-丙烯基)苯甲醛难以异构化,因此二烯底物1- [3-异丙氧基-4-甲氧基-2-(1-甲基丙烯基) ))-苯基]-丙-2-烯-1-醇和1- [3-异丙氧基-4-甲氧基-2-(1-甲基丙烯基)-苯基] -2-甲基丙-2-烯-1-醇通过添加格氏试剂为3-异丙氧基-4-甲氧基-2-(1-甲基-2-丙烯基)苯甲醛,随后arylallyl