Abstract From an ethanolic extract of Peschierafuchsiaefolia three quaternary alkaloids have been isolated and their structures determined from their spectral data as 12-methoxy-4-methylvoachalotine, 12-methoxy-4-methylvoachalotine ethyl ester and fuchsiaefoline. Analyses of the 13 C NMR spectra of some sarpagine alkaloids were carried out to confirm the structures of these compounds.
BRAGA, RAGUEL M.;REIS, FRANCISCO DE A. M., PHYTOCHEMISTRY, 26,(1987) N 3, 833-836
作者:BRAGA, RAGUEL M.、REIS, FRANCISCO DE A. M.
DOI:——
日期:——
General Approach for the Synthesis of 12-Methoxy-Substituted Sarpagine Indole Alkaloids Including (−)-12-Methoxy-<i>N</i><sub>b</sub>-methylvoachalotine, (+)-12-Methoxy-<i>N</i><sub>a</sub>-methylvellosimine, (+)-12-Methoxyaffinisine, and (−)-Fuchsiaefoline
作者:Hao Zhou、Xuebin Liao、Wenyuan Yin、Jun Ma、James M. Cook
DOI:10.1021/jo052081t
日期:2006.1.1
a Schöllkopf-based chiralauxiliary in good yield. This ester was then employed in the first regiospecific, stereospecific total synthesis of (+)-12-methoxy-Na-methylvellosimine, (+)-12-methoxyaffinisine, (−)-fuchsiaefoline, and 12-methoxy-Nb-methylvoachalotine in excellent overall yield. The asymmetric Pictet−Spengler reaction and enolate-driven palladium-catalyzed cross-coupling processes served as