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A general method for the synthesis of bastaranes and isobastaranes: First total synthesis of bastadins 5, 10, 12, 16, 20, and 21

机译:合成Bastaranes和isobastaranes的一般方法:第一个总合成巴斯塔锡5,10,12,16,20和21

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摘要

A general strategy for the synthesis of twenty naturally occurring bastadins (all but bastadin 3) is presented. A key retrosynthetic disconnection of the two amide bonds, common in all target molecules, bisects the macrocyclic core into two diaryl ether fragments, an alpha,omega-diamine (western part) and an alpha,omega-dicarboxylic acid (eastern part). Efficient preparation of the synthetically challenging o-mono or dibromo-substituted diaryl ether linkages was achieved employing the diaryl iodonium salt method. Regarding the western part, variations of the aliphatic chain were more efficiently secured by the preparation of two different alpha,omega-aminonitrile moieties. Cobalt boride mediated reduction of the nitrile functionality established the required diamines and, at the same time, provided the necessary variation of the aromatic-ring bromination pattern. Regarding the eastern part, two different dicarboxyl precursors had to be prepared in order to accommodate bromination-pattern variations. Coupling and subsequent macrolactamization of different combinations of these key intermediates may lead at will to any member of this family of marine natural products. Four bastaranes (bastadins 5, 10, 12 and 16) and two isobastaranes (bastadins 20 and 21) were synthesized as a demonstration of the flexibility and efficiency of the approach presented.
机译:介绍了合成20天然存在的副杀蛋白的一般策略(All但Bastadin 3)。两个酰胺键的关键逆转性断开在所有靶分子中常见,使大环核分为两种二芳基醚片段,α,ω-二胺(西部)和α,ω二羧酸(东部)。使用二芳基碘鎓盐法实现了合成挑战的O-Mono或二溴取代的二芳基醚键的高效制备。关于西部,通过制备两种不同的α,甘露腈部分,更有效地确保了脂族链的变化。硼化钴介导的丁腈官能度的降低建立了所需的二胺,同时提供芳香环溴化图案的必要变化。关于东部,必须制备两种不同的二羧基前体,以适应溴化溴化型变化。这些关键中间体的不同组合的偶联和随后的Macroactamization可能会导致该家庭海洋天然产物的任何成员的意志。合成了四种混蛋(巴斯塔丁酸盐5,10,12和16)和两种含有屠杀20和21),作为呈现的灵活性和效率的证明。

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