Studies on the alkaloids of Securinega virosa Pax. et Hoffm.—I
作者:T. Nakano、T.H. Yang、S. Terao
DOI:10.1016/s0040-4020(01)98547-3
日期:1963.1
visora Pax. et Hoffm. of the Euphorbiaceae family has led to the isolation of a new alkaloid named virosecurinine. The structure elucidation of this alkaloid (I) is described. Direct comparison of this alkaloid with securinine isolated from S. suffruticosa Rehd. reveals that securinine has the antipodal configuration of virosecurinine.
Biogenesis inspired chemical investigation of a Chinese folk medicine, Flueggea virosa, returned three unprecedented C,C-linked trimeric Securinega alkaloids, fluevirosines A–C (1–3). Their absolute structures were characterized on the basis of spectroscopic data and computational analysis. Compounds 2 and 3 showed inhibition against the splicing of XBP1 mRNA.
SmI<sub>2</sub>-Mediated Radical Coupling Strategy to Securinega Alkaloids: Total Synthesis of (−)-14,15-Dihydrosecurinine and Formal Total Synthesis of (−)-Securinine
The asymmetric totalsynthesis of (−)-14,15-dihydrosecurinine and the formal totalsynthesis of (−)-securinine were accomplished starting from an easily available malimide. A concise SmI2-mediated radical couplingstrategy has been developed to construct the bridged α-hydroxy 6-azabicyclo[3.2.1]octanone in four steps with high diastereoselectivity.