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■ Three New D-Lactone Ring Isomeric Phragmalin-Type Limonoids from Chukrasia tabularis var. velutina

Yi Li, Jun Luo, Qiang Wang,* and Ling-Yi Kong*

*School of Traditional Chinese Medicine, State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China

Abstract

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 δ-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, HMBC, and ROESY experiments.