Total synthesis of (-)-spirangien A, an antimitotic polyketide isolated from the myxobacterium Sorangium cellulosum.

Total synthesis of (-)-spirangien A, an antimitotic polyketide isolated from the myxobacterium Sorangium cellulosum.
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(-)-spirangien A 的全合成,这是一种从纤维素粘杆菌中分离出来的抗有丝分裂聚酮化合物。

DOI:
10.1002/asia.200800445
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发表时间:
2009
期刊:
Chemistry, an Asian journal
影响因子:
--
通讯作者:
Paterson I
Paterson I
中科院分区:
--
文献类型:
--
作者:
Paterson I

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描述了含细胞毒性螺缩醛的聚酮化合物 (-)-spirangien A 的立体控制全合成。该方法利用基于羟醛的策略构建了一种常见的立体四元体中间体,该中间体被精心设计成螺缩醛核心,然后引入不稳定的含戊烯侧链,在避光条件下使用连续的 Stille 交叉偶联反应进行。描述了 (−)-spirangien A 的首次全合成,这是一种粘细菌来源的有效细胞毒性和抗真菌聚酮化合物。通过使用通过有效的羟醛还原序列获得的常见1,3-二醇中间体来安装C15-C18和C25-C28立体四分体,以及试剂控制的硼羟醛偶联,然后进行螺缩醛化,开发了一种高度收敛的策略来构建复杂的螺缩醛核。这种先进的螺缩醛中间体转化为 (+)-螺环二烯,之前是通过螺环 A 的受控降解获得的,然后通过使用烯丙基硼化-Peterson 序列安装截短的侧链来实现。然后通过不饱和 C1-C12 侧链的受控连接实现 (−)-spirangien A 的全合成,避免暴露在光下。利用 Stork-Wittig 烯化和双 Stille 交叉偶联序列安装了具有交替 (Z) 和 (E) 烯烃的精致共轭五烯发色团,最初生成了 spirangien A 的甲酯,事实证明它比相应的游离酸更稳定。随后仔细水解得到 (−)-spirangien A,验证了相对和绝对构型。
A stereocontrolled total synthesisof the cytotoxic spiroacetal‐containing polyketide (−)‐spirangien A is described. This utilizes an aldol‐based strategy to construct a common stereotetrad intermediate that was elaborated into the spiroacetal core, followed by the introduction of the unstable pentaene‐containing side chain, performed with exclusion of light, using sequential Stille cross‐coupling reactions.An expedient first total synthesis of (−)‐spirangien A, a potent cytotoxic and antifungal polyketide of myxobacterial origin, is described. By using a common 1,3‐diol intermediate obtained by an efficient aldol‐reduction sequence for installation of the C15–C18 and C25–C28 stereotetrads and a reagent‐controlled boron aldol coupling followed by spiroacetalization, a highly convergent strategy was developed for construction of the elaborate spiroacetal core. Conversion of this advanced spiroacetal intermediate into (+)‐spirangien diene, obtained previously by controlled degradation of spirangien A, was then achieved by installation of the truncated side‐chain using an allylboration–Peterson sequence. The total synthesis of (−)‐spirangien A was then achieved by the controlled attachment of the unsaturated C1–C12 side‐chain, avoiding exposure to light. A Stork–Wittig olefination and double Stille cross‐coupling sequence was exploited to install the delicate conjugated pentaene chromophore featuring alternating (Z)‐ and (E)‐olefins, leading initially to the methyl ester of spirangien A, which proved significantly more stable than the corresponding free acid. Subsequent careful hydrolysis afforded (−)‐spirangien A, validating the relative and absolute configuration.
硼介导的β-烷氧基甲基酮羟醛反应中的1,5-反立体控制:甲酰基氢键的作用。
DOI: 10.1021/jo701849x
发表时间: 2008
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影响因子: --
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影响因子: 1.8
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期刊: ORGANIC LETTERS
影响因子: 5.2
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DOI: 10.1021/jo00300a031
发表时间: 1990-06-22
影响因子: 3.6
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