Chemical constituents from leaves of Cajanus cajan / 中草药

ABSTRACT

Objective: To study the chemical compounds from the leaves of Cajanus cajan. Methods: Normal phase silica gel, medium-pressure ODS, MCI, and Sephadex LH-20 gel column chromatographies were used to isolate and purify the constituents. And their structures were identified by their physical properties, nuclear magnetic resonance spectrum, mass spectrometry, etc. Results: Twenty-three compounds were separated from the alcohol extract in the leaves of C. cajan. They were cajanine (1), longistyline A (2), longistyline C (3), cajanolactone A (4), pinostrobin (5), orientin (6), isovitexin (7), vitexin (8), cajanol (9), cajanin (10), prunetin (11), pratensein (12), (2R, 3R)-2, 3-dihydro-5-7, 4'-dimethoxyflavone (13), ethyl 10', 16'-dihydroxy hexadecanoate (14), vanillic acid (15), ethyl heptadecanoate (16), 2-O-quebrachitol (17), 2, 3, 4-trihydroxy-isovaleric acid (18), stigmasterol (19), betulinic acid (20), heptadecanoic acid (21), β-sitosterol (22), and β-daucosterol (23). Conclusion: Compounds 10-19 are obtained from this plant for the first time.