Bs. Joshi et al., H-1-NMR AND C-13-NMR ASSIGNMENTS FOR SOME PYRROLO[2,1B]-QUINAZOLINE ALKALOIDS OF ADHATODA-VASICA, Journal of natural products, 57(7), 1994, pp. 953-962
From the leaves of Adhatoda vasica, the pyrrolo[2,1b]quinazoline alkal
oids l-vasicine [1], l-vasicinone [2], l-vasicol [3], anisotine [7], 3
-hydroxyanisotine [8], and a new alkaloid, vasnetine [9] have been iso
lated and their structures established by H-1- and C-13-nmr spectral s
tudies. The chemical shift assignments for these alkaloids were confir
med by H-1 homonuclear COSY, DEFT, HETCOR, selective INEPT and HMBC nm
r experiments.