Lawsone aldehydes were directly transformed into the biologically important, unique carbon skeleton of chiral methanobenzo[f]azulenes/methanodibenzo[a,d][7]annulenes in high dr and ee and in very good yields by using quinine-thiourea-catalyzed tandem Wittig/intramolecularMichael/intramolecular aldol reactions. This asymmetriccatalytic tandem protocol will be highly useful because these final molecules
通过使用奎宁 - 硫脲催化的串联 Wittig,Lawsone 醛直接转化为具有高 dr 和 ee 且产率非常高的手性甲烷苯并 [f] azulenes/methanodibenzo[a,d][7]annulenes 的生物学重要的独特碳骨架/分子内迈克尔/分子内羟醛反应。这种不对称催化串联方案将非常有用,因为这些最终分子是重要抗生素的基本骨架。