A NEW SECO-LIMONOID FROM THE INFLORESCENCES OF Dictyoloma vandellianum

Structure Revision of the Sesquiterpene Nordine Based on NMR Spectroscopic Analysis and X-ray Crystallography

“…The reaction mixture was diluted with H 2 O (30 mL) and extracted with CHCl 3 (3 × 30 mL). The CHCl 3 extract was washed successively with 5% hydrochloric acid and H 2 O, dried over Na 2 SO 4 , and concentrated under reduced pressure to afford an acetylated derivative ( 1a ) (4.7 mg). , …”

“…The CHCl 3 extract was washed successively with 5% hydrochloric acid and H 2 O, dried over Na 2 SO 4 , and concentrated under reduced pressure to afford an acetylated derivative (1a) (4.7 mg). 13,14 Acetylated derivative (1a): 1 H NMR (CDCl 3 , 500 MHz) 5.45 (1H, dd, J = 10.5, 5.0 Hz, H-2), 5.23 (1H, s, H-12a), 5.09 (1H, s, H-12b), 4.55 (1H, dd, J = 6.5, 4.5 Hz, H-6), 3.67 (1H, dd, J = 11.5, 8.0 Hz, H-10), 2.56 (1H, m, H-4a), 2.34 (1H, m, H-4b), 2.34 (1H, m, H-5a,) 2.14 (1H, dd, J = 20.0, 5.5 Hz, H-1a), 2.03 (3H, s, acetoxy CH 3 ), 1.97 (3H, s, acetoxy CH NaO 5 , 316.1985).…”