Illicium sesquiterpenes: divergent synthetic strategy and neurotrophic activity studies.

Illicium sesquiterpenes: divergent synthetic strategy and neurotrophic activity studies.
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DOI:
10.1002/chem.201300198
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发表时间:
2013-05-10
影响因子:
4.3
通讯作者:
Theodorakis, Emmanuel A.
Theodorakis, Emmanuel A.
中科院分区:
化学2区
文献类型:
--
作者:
Trzoss, Lynnie;Xu, Jing;Lacoske, Michelle H.;Mobley, William C.;Theodorakis, Emmanuel A.

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Majucin-type sesquiterpenes from Illicium sp., such as jiadifenolide (2), jiadifenin (3) and (1R,10S)-2-oxo-3,4-dehydroxyneomajucin (4, ODNM), possess a complex caged chemical architecture and remarkable neurotrophic activities. As such, they represent attractive small molecule leads against various neurodegenerative diseases. We present an efficient, enantioselective and unified synthesis of 2, 3 and 4 and designed analogues that diverge from tetracyclic key intermediate 7. The synthesis of 7 is highlighted by the use of an enantioselective Robinson annulation reaction (construction of AB rings), a Pd-mediated carbomethoxylation reaction (construction of C ring) and a one-pot oxidative reaction cascade (construction of D ring). Evaluation of the neurotrophic activity of these compounds led to the identification of several highly potent small molecules that significantly enhanced the activity of nerve growth factor (NGF) in PC-12 cells. Moreover, efforts to define the common pharmacophoric motif suggest that substitution at the C-10 center significantly affects bioactivity, while the hemiketal moiety of 2 and 3 and the C-1 substitution might not be critical to the neurotrophic activity.
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