PdCl2(MeCN)2 in combination with dppp proved to be a powerful and efficient catalyst for the coupling of sterically hindered N-arylsulfonylhydrazones with aryl halides, thus providing a flexible and convergent access to tetrasubstituted olefins related to iso-combretastatin A4 in good yields. This new protocol has been applied successfully to the formal synthesis of biphenylisopropylidene 4-pyridine
PdCl 2(MeCN)2与dppp的结合被证明是一种强大而有效的催化剂,可用于将位阻N-芳基磺酰catalyst与芳基卤化物偶合,从而以高收率灵活,收敛地获得与异-combretastatin A4有关的四取代烯烃。该新方案已成功应用于
生物学上感兴趣的
联苯异亚丙基4-
吡啶CYP17
抑制剂12b的正式合成。