Studies on the Constituents of Asclepiadaceae Plants. XXXIX. Component of Marsdenia tomentosa DECNE : Structure of Deacetyldehydrotomentodin, 20-O-Acetylpenupogenin, Deacetylkidjoladinin, and Kidjoladinin

抄録

Four new polyoxypregnane derivatives, deacetyldehydrotomentodin (12β-O-cinnamoylutendin) (III), 20-O-acetylpenupogenin (12β-O-cinnamoyl-20-O-acetylsarcostin) (V), deacetylkidjoladinin (12β-O-tigloylsarcostin) (VIII), and kidjoladinin (12β-O-tigloyl-20-O-acetylsarcostin) (IX), were isolated from the stem of Marsdenia tomentosa DECNE. Deacetyldehydrotomentodin is the first example of a monoester possessing the utendin skeleton to be isolated from the Asclepiadaceae plants.