Asymmetric [4 + 3] cycloadditions between vinylcarbenoids and dienes: application to the total synthesis of the natural product (-)-5-epi-vibsanin E.

Asymmetric [4 + 3] cycloadditions between vinylcarbenoids and dienes: application to the total synthesis of the natural product (-)-5-epi-vibsanin E.
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DOI:
10.1021/ja9019484
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发表时间:
2009-06-17
影响因子:
15
通讯作者:
Williams CM
Williams CM
中科院分区:
化学1区
文献类型:
--
作者:
Schwartz BD;Denton JR;Lian Y;Davies HM;Williams CM

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(−)-5-epi-vibsanin E(2)的全合成经过18步完成。该合成结合了乙烯基卡宾和二烯之间的铑催化的[4 + 3]环加成反应,以快速生成三环核心,并采用有效的末端策略引入剩余的侧链。[4 + 3]环加成通过环丙烷化形成二乙烯基环丙烷,然后通过科普重排形成环庚二烯而发生。在手性铑配合物Rh_2(S-PPh_3)_4催化下,反应中生成的季铵型立体中心具有很高的不对称诱导作用。
The total synthesis of (−)-5-epi-vibsanin E (2) has been achieved in 18 steps. The synthesis combines the rhodium-catalyzed [4 + 3] cycloaddition between a vinylcarbenoid and a diene to rapidly generate the tricyclic core with an effective end game strategy to introduce the remaining side-chains. The [4 + 3] cycloaddition occurs by a cyclopropanation to form a divinylcyclopropane followed by a Cope rearrangement to form a cycloheptadiene. The quaternary stereogenic center generated in the process can be obtained with high asymmetric induction when the reaction is catalyzed by the chiral dirhodium complex, Rh2(S-PTAD)4.
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发表时间: 2008
影响因子: 2.7
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