Total synthesis of (-)-kopsinine and ent-(+)-kopsinine.
Total synthesis of (-)-kopsinine and ent-(+)-kopsinine.
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DOI:
10.1016/j.tet.2014.07.094
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发表时间:
2015-06-03
期刊:
影响因子:
2.1
通讯作者:
Boger, Dale L.
中科院分区:
文献类型:
--
作者:
Lee, Kiyoun;Boger, Dale L.
The total synthesis of (−)-kopsinine and its unnatural enantiomer is detailed, enlisting a late-stage SmI2-mediated transannular free radical conjugate addition reaction for construction of the core bicyclo[2.2.2]octane ring system with strategic C21–C2 bond formation. Key to the approach is assemblage of the underlying skeleton by an intramolecular [4+2]/[3+2] cycloaddition cascade of a 1,3,4-oxadiazole that provided the precursor C21 functionalized pentacyclic ring system 1 in a single step in which the C3 methyl ester found in the natural product served as a key 1,3,4-oxadiazole substituent, activating it for participation in the initiating Diels–Alder reaction and stabilizing the intermediate 1,3-dipole.
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影响因子:
15
作者:
Campbell, Erica L.;Zuhl, Andrea M.;Liu, Christopher M.;Boger, Dale L.
通讯作者:
Boger, Dale L.
影响因子:
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作者:
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15
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Kato D;Sasaki Y;Boger DL
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影响因子:
3.6
作者:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
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