approach to the total synthesis of the antimicrotubule agent welwistatin is described. Key transformations include (1) a 7-endo intramolecular conjugate addition reaction of enone 6 to deliver the strained bicyclo[4.3.1]decanone 5; (2) a 6pi electrocyclic ring closure of trienecarbamate 16 followed by oxidation to afford protected aniline 17; and (3) an intramolecular cyclization of acetic acid derivative
描述了一种全合成抗微管剂welwistatin的方法。关键的转化包括(1)烯酮6的7内-分子内共轭加成反应,以释放出应变的双环[4.3.1]
癸烷5。(2)将
三烯氨基甲酸酯16进行6pi环电环封闭,然后氧化得到受保护的
苯胺17;(3)
乙酸衍
生物18的分子内环化反应生成
吲哚19。