THREE NEW D-LACTONE RING ISOMERIC PHRAGMALIN-TYPE LIMONOIDS FROM CHUKRASIA TABULARIS VAR. VELUTINA

[摘要]：Three new D-lactone ring isomeric phragmalin-type limonoids, tabulalins G-I (1-3), were isolated from the stem barks of Chukrasia tabularis var. velutina. Compound 1 possesses C-16/C-30 delta-lactone ring (D), which was unusual in phragmalins, and that of 2 and 3 were C-16/C-17. The structures of these three new compounds were elucidated on HR-ESI-MS, 1D and 2D NMR including HSQC, IIMBC, and ROESY experiments.

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