The total synthesis of Lycopodium alkaloid (−)-huperzine A has been accomplished in 10 steps with 17% overall yield from commercially abundant (R)-pulegone. The synthetic route features an efficientsynthesis of 4 via a Buchwald–Hartwig coupling reaction, a dianion-mediated highly stereoselective alkylation of 4, and a rare example of an intramolecular Heck reaction of an enamine-type substrate. The
Divergent Total Synthesis of the Lycopodium Alkaloids Huperzine A, Huperzine B, and Huperzine U
作者:Rui Ding、Jian-Guo Fu、Guang-Qiang Xu、Bing-Feng Sun、Guo-Qiang Lin
DOI:10.1021/jo402419h
日期:2014.1.3
Buchwald–Hartwig coupling and Heck cyclization reactions and an Ir-catalyzed olefin isomerization reaction. This work has established the absoluteconfigurations of huperzine B and huperzine U and revealed that natural huperzine A, huperzine B, and huperzine U possess the same set of absolute stereochemistries, thus providing support for the potential role of huperzine B and huperzine U in the biosynthesis of huperzine