Enantioselective total synthesis of (-)-acetylaranotin, a dihydrooxepine epidithiodiketopiperazine.

Enantioselective total synthesis of (-)-acetylaranotin, a dihydrooxepine epidithiodiketopiperazine.
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DOI:
10.1021/ja209354e
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发表时间:
2012-02-01
影响因子:
15
通讯作者:
Reisman, Sarah E.
Reisman, Sarah E.
中科院分区:
化学1区
文献类型:
--
作者:
Codelli, Julian A.;Puchlopek, Angela L. A.;Reisman, Sarah E.

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The first total synthesis of the dihydrooxepine-containing epidithiodiketopiperazine (ETP) (−)-acetylaranotin (1) is reported. The key steps of the synthesis include an enantioselective azomethine ylide (1, 3)-dipolar cycloaddition reaction to set the absolute and relative stereochemistry, a rhodium-catalyzed cycloisomerization/chloride elimination sequence to generate the dihydrooxepine moiety, and a stereoretentive diketopiperazine sulfenylation to install the epidisulfide. This synthesis provides access to (−)-1 in 18 steps from inexpensive, commercially available starting materials. We anticipate that the approach described herein will serve as a general strategy for the synthesis of additional members of the dihydrooxepine ETP family.
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