A Synthesis of Exiguaquinol Dessulfate.

A Synthesis of Exiguaquinol Dessulfate.
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DOI:
10.1002/chem.201604506
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发表时间:
2016-12-12
期刊:
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子:
--
通讯作者:
Vanderwal CD
Vanderwal CD
中科院分区:
其他
文献类型:
--
作者:
Schwarzwalder GM;Scott DR;Vanderwal CD

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A concise and stereoselective synthesis of exiguaquinol dessulfate is described. Sequential application of a Diels–Alder cycloaddition, a desymmetrizing aldol addition, and a reductive Heck cyclization established most of the architecture of exiguaquinol, and a carefully choreographed introduction of the polar substituents afforded the title compound; unfortunately, naphthoquinol sulfation could not be achieved to deliver exiguaquinol. Our hypothesis regarding the configurational preference of the N-acyl hemiaminal, which was based upon an analysis of internal hydrogen-bonding interactions with polar functional groups, was proven correct. Unfortunately, the title compound did not demonstrate any bactericidal activity against H. pylori cultures. A desymmetrization strategy led to the synthesis of a congener of exiguaquinol, an inhibitor of the H. pylori MurI enzyme and a potential antibiotic. The pentacyclic architecture was accessed via convergent Diels–Alder and aldol additions, followed by a reductive Heck cyclization to forge the vicinal quaternary stereogenic centers.
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