Divergent total syntheses of (-)-aspidospermine and (+)-spegazzinine.
Divergent total syntheses of (-)-aspidospermine and (+)-spegazzinine.
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DOI:
10.1021/ol300599p
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发表时间:
2012-04-20
期刊:
影响因子:
5.2
通讯作者:
Boger DL
中科院分区:
文献类型:
--
作者:
Lajiness JP;Jiang W;Boger DL
Divergent total syntheses of (+)-spegazzinine (1) and (−)-aspidospermine (2) and their extensions to the synthesis of C19-epi-aspidospermine and C3-epi-spegazzinine are detailed, confirming the relative stereochemistry and establishing the absolute configuration of (+)-spegazzinine. A powerful intramolecular [4 + 2]/[3 + 2] cycloaddition cascade of a 1,3,4-oxadiazole provided the pentacyclic skeleton and all the requisite stereochemistry of the natural products in a single reaction that forms three rings, four C–C bonds, and five stereocenters.
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