Abstract:
Two new alkaloids along with eleven known ones, were isolated from the 70% ethanol extract of the roots of
Scrophularia ningpoensis Hemsl. by various chromatographic methods, including silica gel, Sephadex LH-20, reverse phase C
18 and semi-preparative HPLC. Their structures were determined by physicochemical properties and spectroscopic methods, including UV, IR, MS, 1D/2D NMR and ECD. They were identified as 11
α-isopropylcytisine (
1), 13
α-isopropylcytisine (
2), uracil (
3), (
S)-5-hydroxypyrrolidin-2-one (
4), pterolactam (
5), methyl-
L-pyroglutamate (
6), kaempferide (
7), luteolin (
8), 5,6,7,4'-tetramethoxyflavone (
9), 6'-hydroxy-2',3',4,4'-tetramethoxychalcone (
10), scopolin (
11), hymexelsin (
12), and 8-hydroxycoumarin (
13). Among them, compounds
1 and
2 are two new compounds, while compounds
3,
4,
7-
12 were isolated from this plant for the first time. An antitumor activity assay showed that compounds
8 and
9 had weak cytotoxicity against breast cancer cells (4T1).