Cyclization via carbolithiation of alpha-amino alkyllithium reagents.
Cyclization via carbolithiation of alpha-amino alkyllithium reagents.
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DOI:
10.1021/ol801523r
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发表时间:
2008-09-18
期刊:
影响因子:
5.2
通讯作者:
Rychnovsky SD
中科院分区:
文献类型:
--
作者:
Bahde RJ;Rychnovsky SD
We report a new route to tertiary α-amino stereocenters by sequential alkylation of α-amino nitriles followed by reductive lithiation of the nitrile and cyclization onto an alkene. Reductive lithiation of α-amino nitriles using lithium 4,4′-di-tert-butylbiphenylide (LiDBB) and subsequent intramolecular carbolithiation proceeded with modest to high diastereoselectivity to deliver cyclic or spirocyclic ring systems. The stereoselectivity of these intramolecular carbolithiations was examined using density function calculations to evaluate plausible transition state models.
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