A concise total synthesis of (±)-vigulariol

A concise total synthesis of (±)-vigulariol
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DOI:
10.1002/anie.200603880
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发表时间:
2007-01-01
影响因子:
16.6
通讯作者:
Gobbi, Luca
Gobbi, Luca
中科院分区:
化学1区
文献类型:
--
作者:
Clark, J. Stephen;Hayes, Stewart T.;Gobbi, Luca

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评论:用碘化钐 (II) 处理醛 A,通过还原环化得到单一非对映异构体 B。随后,将六氟乙酰丙酮铜 (II) (D) 添加到 a-重氮酮 C 中,通过初始氧鎓叶立德 E 的 [2, 3]-σ 重排得到 F (Z/E= 5:1)。用 AIBN 和亚化学计量乙硫醇实现了应变 (E)-F 异构化为 (Z)-F。 G 与甲基乙烯基酮的分子内 Diels-Alder 反应生成 H(外切/内切 = 2:1)。差向异构化仅产生exo-H。
Comment: Treatment of aldehyde A with samarium (II) iodide gave B as a single diastereoisomer by reductive cyclization. Later, addition of copper (II) hexafluoroacetylacetonate (D) to a-diazo ketone C gave F (Z/E= 5: 1) by [2, 3]-sigmatropic rearrangement of incipient oxonium ylide E. Isomerization of strained (E)-F to (Z)-F was achieved with AIBN and sub-stoichiometric ethanethiol. Intramolecular Diels–Alder reaction of G with methylvinyl ketone furnished H (exo/endo= 2: 1). Epimerization gave exo-H exclusively.