1393110-52-5Relevant articles and documents
Divergent total synthesis of the lycopodium alkaloids huperzine A, huperzine B, and huperzine U
Ding, Rui,Fu, Jian-Guo,Xu, Guang-Qiang,Sun, Bing-Feng,Lin, Guo-Qiang
, p. 240 - 250 (2014/01/17)
Huperzine A, huperzine B, and huperzine U are congeners isolated from the Chinese herb Huperzia serrata (=Lycopodium serratum) in minuscule amounts. The most efficient total synthesis of huperzine A, the first asymmetric total syntheses of huperzine B, and the first total synthesis of huperzine U have been achieved efficiently in overall yields of 17%, 10%, and 9%, respectively, each spanning 10-13 steps from (R)-pulegone. The featured steps include palladium-catalyzed Buchwald-Hartwig coupling and Heck cyclization reactions and an Ir-catalyzed olefin isomerization reaction. This work has established the absolute configurations 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 A.
Synthesis of (R)-(+)-4-methylcyclohex-2-ene-1-one
Tun, Maung Kyaw Moe,Herzon, Seth B.
, p. 9422 - 9425 (2013/01/15)
A three-step synthesis of (R)-(+)-4-methylcyclohex-2-ene-1-one (1) from (R)-(+)-pulegone (3), proceeding in 44% overall yield, is described. The sequence comprises vinyl triflate formation, site-selective ozonolysis, and reduction. The route requires only one chromatographic purification and provides a convenient method to access multigram quantities of (R)-(+)-4-methylcyclohex- 2-ene-1-one (1).
An efficient total synthesis of (-)-huperzine A
Ding, Rui,Sun, Bing-Feng,Lin, Guo-Qiang
supporting information, p. 4446 - 4449 (2012/10/29)
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 efficient synthesis of 4 via a Buchwald-Hartwig coupling reaction,