Chemical Constituents from Annona Glabra

Abstract

AbstractA new kaurane diterpenoid, annoglabasin G (16α‐hydro‐19‐acetoxy‐ent‐kauran‐17‐al) (1), along with 27 compounds including 18 kaurane diterpenoids, 16β‐hydro‐ent‐kauran‐17‐oic acid (2), 16α‐hydro‐ent‐kauran‐17‐oic acid (3), 19‐nor‐ent‐kauran‐4α‐ol‐17‐oic acid (4), 16α‐hydro‐19‐ol‐ent‐kauran‐17‐oic acid (5), ent‐kaur‐16‐en‐19‐oic acid (6), 16α‐hydroxy‐ent‐kauran‐19‐oic acid (7), 16α,17‐dihydroxy‐ent‐kauran‐19‐oic acid (8), 16β,17‐dihydroxy‐ent‐kauran‐19‐oic acid (9), 16α‐hydro‐ent‐kauran‐17,19‐dioic acid (10), 16β‐hydroxy‐17‐acetoxy‐ent‐kauran‐19‐oic acid (11), 16β‐hydro‐17‐hydroxy‐ent‐kauran‐19‐al (12), 16α‐hydro‐17‐hydroxy‐ent‐kauran‐19‐al (13), 16β,17‐dihydroxy‐ent‐kauran‐19‐al (14), 16α‐hydro‐19‐al‐ent‐kauran‐17‐oic acid (15), 16α‐hydro‐17‐acetoxy‐ent‐kauran‐19‐al (16), 16α‐hydro‐19‐acetoxy‐ent‐kauran‐17‐oic acid (17), ent‐kaur‐15‐en‐19‐oic acid (18) and ent‐kaur‐15‐en‐17‐ol‐19‐oic acid (19); four acetogenins, annomontacin (20), annonacin (21), isoannonacinone (22) and squamocin (23); four steroids, β‐sitosterol (24), stigmasterol (25), β‐sitosteryl‐D‐glucoside (26) and stigmasteryl‐D‐glucoside (27) and one oxoaporphine, liriodenine (28), were isolated from the fresh fruits of Annona glabra. These compounds were characterized and identified by physical and spectral evidence.