Lignans and neolignans from Piper schmidtii

Neolignan Derivatives from the Flower of Magnolia biondii Pamp. and their Effects on IL-2 expression in T-cells

“…Chromatographic purification of chloro- , and maglifloenone (11) 19 by comparing their physicochemical and spectroscopic data with those reported in the literature (Fig. 1).…”

Four New Jacaranone Analogs from the Fruits of a Beibu Gulf Mangrove Avicennia marina

“…Compound 1 showed (MeOH) of −14.7°. The reported rotation value for cornoside is negative −10.5° [13], whose stereochemistry of the aglycone and the β- d -glucosyl residue have been established by enzymatic hydrolysis and other methods [13,14,15]. The reported rotation value after poly-acetylation of cornoside is also negative ( −10.2°) [16].…”

“…The presence of a molecular ion at m/z 701.2630 [M + Na] + (calcd [M + Na] + , 701.2633) in the HRESIMS spectrum suggested a molecular formula of C 30 H 46 O 17 . Analysis of the 1 H NMR data (Table 2) showed the presence of two cyclohexanone moieties in 4 [14] by the presence of the proton signals at δ H 6.95 (1H, d, J = 10.0 Hz, H-2), 5.87 (1H, d, J = 10.0 Hz, H-3), 3.67 (1H, dd, J = 7.0, 3.6 Hz, H-6), 2.82 (1H, m, H-5α), and 2.49 (1H, m, H-5β)], and [δ H 6.93 (1H, d, J = 10.0 Hz, H-2‴), 5.85 (1H, d, J = 10.0 Hz, H-3‴), 3.64 (1H, dd, J = 7.0, 3.6 Hz, H-6‴), 2.82 (1H, m, H-5‴α), and 2.49 (1H, m, H-5‴β), and the carbon signals at δ C 198.6 (C-4), 154.7 (C-2), 127.1 (C-3), 72.4 (C-1), 82.8 (C-6), and 38.9 (C-5) and δ C 198.6 (C-4‴), 154.0 (C-2‴), 127.0 (C-3‴), 72.4 (C-1‴), 82.7 (C-6‴), and 38.9 (C-5‴). The proton signals at δ H 3.67 (1H, dd, J = 7.0, 3.6 Hz, H-6) and 3.64 (1H, dd, J = 7.0, 3.6 Hz, H-6‴), and corresponding carbon signals at δ C 82.8 (C-6), 82.7 (C-6‴), 38.9 (C-5) and 38.9 (C-5‴) revealed that 4 was the CH 3 OH adduct of cornoside [13].…”

Phytochemicals derived from Piper longum in insect and mite pests management: A review

“…Furthermore, some Piperaceae plant fruits have been used as food-flavoring agents and arealso known to possess insecticidal activities (Miyakado et al, 1979;Su and Horvat, 1981;Tyagi, 1993). Piper guineese Schumacher &Thonn and P. nigrum L. are used as insecticides and molluskicides in several areas of Africa (Su and Horvat, 1981;Ivbijaro and Bolaji, 1990).…”