A new total synthesis of the neuronal cell-protecting carbazole alkaloid carbazomadurin A is described. The key step was an allene-mediatedelectrocyclicreaction involving an indole [b]-bond for the construction of a highly substituted carbazole ring. The E-alkenyl side chain at the C1 position of carbazole was introduced between O-triflate and alkenyl pinacol borate using the Suzuki–Miyaura reaction
描述了神经细胞保护咔唑生物碱咔唑马杜林A的新的全合成。关键步骤是用于构建高度取代的咔唑环的涉及吲哚[ b ]键的异戊二烯介导的电环反应。使用Suzuki–Miyaura反应,将咔唑C1位置的E-烯基侧链引入O-三氟甲磺酸盐和烯基频哪醇硼酸酯之间。用TBAF裂解SEM组,并还原甲酰基以提供carBAzomadurin A.