Enantioselective total synthesis and confirmation of the absolute and relative stereochemistry of streptorubin B.

Enantioselective total synthesis and confirmation of the absolute and relative stereochemistry of streptorubin B.
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DOI:
10.1021/ja109165f
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发表时间:
2011-02-16
影响因子:
15
通讯作者:
Thomson RJ
Thomson RJ
中科院分区:
化学1区
文献类型:
--
作者:
Hu DX;Clift MD;Lazarski KE;Thomson RJ

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The enantioselective total synthesis of the pyrrolophane natural product streptorubin B is described. Key steps in the concise route include application of a one-pot enantioselective aldol cyclization/Wittig reaction and an anionic oxy-Cope rearrangement to forge the crucial 10-membered ring. Comparisons between CD-spectra of synthetic and natural samples of streptorubin B, coupled with X-ray crystallography, allowed for the determination of the absolute stereochemistry of this natural product for the first time. These studies also provided unambiguous proof of the relative configuration between the butyl sidechain and bis-pyrrole subunit. Additional studies revealed a novel atropstereoselective Paal–Knorr pyrrole condensation and provided fundamental experimental insight into the barrier for atropisomerization of the natural product.
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