Mass Spectrometry of Bis-Quinolizidine Alkaloids: FAB-MS of Oxo-Substituted Sparteines

Table 1

Relative abundances of characteristic ions in the FAB mass spectra of 1– 7.

		Elemental	% Relative abundance
Ion	m/z	composition	1	2	3	4	5	6	7
M+H^⌉ +  a	249	C15H24N2O+H	50	100	100	—	—	—	—
	263	C15H22N2O2+H	—	—	—	100	100	—	—
	265	C15H24N2O2+H	—	—	—	—	—	100	25
M+H-CO^⌉ +  b	221	C14H24N2+H	—	—	8	—	—	—	—
M+H- H2O^⌉ +  c	245	C15H20N2O+H	—	—	—	—	10	—	—
	247	C15H22N2O+H						8	100
d	138	C9H15N+H	57	28	7	—	—	—	—
	151	C9H12NO+H	—	—	—	10	6	3	8
e	154	NBA+H	100	46	9	84	55	58	12
f	136	[NBA+H]-H2O	62	35	15	54	34	39	18

NBA: C₇H₇O₃N.