Polyalongirin A-B, two novel linked compounds from the twigs of Polyalthia longifolia
YUN-SHENG LIN 1, CHIA-YI GUO 2
1 Department of Biological Science and Technology, Meiho University, Pingtung, Taiwan
2 Department of Biological Science and Technology, National Pingtung University of Science and Technology, Pingtung, Taiwan
Two novel linked compounds, Polyalongirin A (1) and Polyalongirin B (2) , have been isolated from the twigs of Taiwanese Polyalthia longifolia. They were composed of a clerodane diterpene linked to an aprophine alkaloid , is an unprecedented natural N-1 and C-16 linked compound. The stuctures of 1 and 2 and their absolute configurations were elucidated by detail analysis of spectroscopic, including 1D and 2D NMR (1H , 13C, 1H - 1H COSY, HMQC, HMBC and NOESY ) spectroscopic data and Kappa CCD Detector.
