Constituents of Asclepiadaceae Plants. XXXV. Component of Marsdenia tomentosa DECNE. Structure of Tomentin and Dehydrotomentin

抄録

Two new polyoxypregnane derivatives, tomentin (12β-O-, 20-O-diacetyltomentogenin) and dehydrotomentin (12β-O, 20-O-diacetylutendin), were isolated from the stem of Marsdenia tomentosa. Dehydrotomentin is a diester possessing the utendin skeleton to be isolated from the Asclepiadaceae plants for the first time. Very characteristic fragment pattern for tomentogenin derivatives was observed in the mass spectrum of tomentin.