Structure Elucidation of Erythrosotidienone and Erythromotidienone- Two New Isoquinoline Alkaloids from Erythrinα vαriegαtα Flowers

Department of Chemistry, Indian Institute of Technology, Hauz khas, New Delhi-110 016

Manuscript received 9 November 1998

Careful examination of the acetone extract of the Erythrinα vαriegαtα flowers has revealed the presence of five compounds, three of which are identified as stigmasterol (1), cycloartenol (2) and erysotramidinc (13). The remaining two compounds are new isoquinolines whose structures have been established on the basis of chemical correlation, derivatization and ir, ¹H nmr, ¹³C nmr and mass spectral analysis. They are tentatively named as erythrosotidienone (4) and erythromotidienone (10). Cycloartenol (2) has been isolated for the first time from Erythrinα species. The occurrence of the new compounds 4 and 10 is of interest from the biogenetic point of view.