The constitution of two new sesquiterpenic ketones
作者:G. Lukas、J.C.N. Ma、J.A. McCloskey、R.E. Wolff
DOI:10.1016/s0040-4020(01)99180-x
日期:1964.1
Concise Synthesis of Astellatol Core Skeleton
作者:Nan Zhao、Shengling Xie、Gui Chen、Jing Xu
DOI:10.1002/chem.201602711
日期:2016.8.26
A ten‐step, enantiospecific synthesis of the highly challenging core skeleton of sesterterpenoid astellatol has been achieved. Key transformations of this strategy include a facile, convergent construction of the tricyclic motif and a SmI2‐induced reductive radical cyclization that forms the pivotal cyclobutane ring.
Described is a short-step synthesis of optically active yamataimine, a 12-membered pyrrolizidinealkaloid of retronecine type. Methyl (1S,5R)-5-methyl-2-oxocyclopentanecarboxylate derived from (R)-(+)-pulegone was converted into the necic acid component required for the synthesis of yamataimine, in a nine-step sequence. Regioselective coupling of (+)-retronecine with the necic acid component via tin-mediated