Synthetic Studies towards NG-121: Diastereoselective Synthesis of NG-121 Methyl Ether
作者:Narshinha Argade、Mandeep Singh
DOI:10.1055/s-0032-1317544
日期:——
Abstract Starting from unsymmetrically O-protected methyl 4-bromo-3,5-dihydroxybenzoate, a facile synthesis of the methyl ether of bioactive natural product NG-121 was accomplished in very good overall yield. The key steps were: Stille coupling reaction of the farnesyl unit with the electron-rich phenolic segment; hydroxy-directed selective epoxidation of the farnesyl chain along with concomitant phenol-driven
摘要 从不对称的O保护的4-溴-3,5-二羟基苯甲酸甲酯开始,以非常好的总收率轻松合成了生物活性天然产物NG-121的甲基醚。关键步骤为:法呢基单元与富电子酚段的斯蒂勒偶联反应;法呢基链的羟基定向选择性环氧化以及伴随的苯酚驱动的分子内区域和非对映选择性闭环成相应的羟基苯并吡喃;和区域选择性甲酰化,然后原位还原内酯化。 从不对称的O保护的4-溴-3,5-二羟基苯甲酸甲酯开始,以非常好的总收率轻松合成了生物活性天然产物NG-121的甲基醚。关键步骤为:法呢基单元与富电子酚段的斯蒂勒偶联反应;法呢基链的羟基定向选择性环氧化以及伴随的苯酚驱动的分子内区域和非对映选择性闭环成相应的羟基苯并吡喃;和区域选择性甲酰化,然后原位还原内酯化。