ABSOLUTE STRUCTURES OF 2 NEW C-13-NORISOPRENOIDS FROM APOLLONIAS-BARBUJANA

Two new C-13-norisoprenoid compounds, (3S,5R,6S,9R)-3,6-dihydroxy-5,6- dihydro-beta-ionol (1) and ,4S,5S,6S,9S)-3,4-dihydroxy-5,6-dihydro-bet a-ionol (2), were isolated from the leaves of Apollonias barbujana. Th e absolute structures were determined by spectroscopic methods and che mical transformations. ,4S,5S,6S,9R)-3,4-Dihydroxy-5,6-dihydro-beta-io nol (3) was also isolated, the structure of which has been determined by X-ray analysis and whose H-1-NMR, C-13-NMR, and MS data are reporte d herein.