Enantioselective total synthesis of (+)-isoboonein
Enantioselective total synthesis of (+)-isoboonein, an iridoid lactone, was accomplished from (-)-dimenthyl bicyclo[2.2.1]hept-5-ene-2,3- dicarboxylate, which was synthesized by diastereoselective Diels-Alder reaction of dimenthyl fumarate with cyclopentadiene.
Tada, Masahiro,Inoue, Sayako,Miki, Takao,Onogi, Shin-Ichi,Kaminaga, Jun-Ichi,Hiraoka, Junko,Kitano, Yoshikazu,Chiba, Kazuhiro
ABELIOSIDES A AND B, SECOIRIDOID GLUCOSIDES FROM ABELIA GRANDIFLORA
Key Word Index - Abelia grandiflora; A. spathulata, A. serrata; Caprifoliaceae; secoiridoid glucoside; abelioside A; abelioside B; structure elucidation; 2-D NMR. - Two new secoiridoid glucosides, abeliosides A and B, were isolated along with cantleyoside and sylvestroside II from Abelia grandiflora.On the basis of spectral and chemical evidence, these new glucosides were identified as esters of secologanic acid or secologanolic acid with an iridoid lactone which may arise from loganin.Cantleyoside was also isolated from A. spathulata and A. serrata.