The Constituents of Conifer Needles. Dilignol Glycosides from Pinus massoniana Lamb.

Two sesquilignans from the wood of Abies marocana

“…The 13CNMR spectrum (Table 2) confirmed the relationship between 6a and la [8] and a triacetyl-guaiacylglycerol ether was established as the structure for this unit, according specifically to the signals at 874.51 (CH), 80.40 (CH) and 63.06 (CH2) [9]. The relative configuration of the glycerol part was established as being threo by comparing the 1HNMR data with the literature [9][10][11][12]. In 6a, H-7" resonated as a doublet (J = 6.2 Hzt at 86.10.…”

Anticholinesterase and β-Site Amyloid Precursor Protein Cleaving Enzyme 1 Inhibitory Compounds from the Heartwood of <i>Juniperus chinensis</i>

“…Although compound 21 was previously reported as being isolated from the needles of Pinus silvestris 22) and Pinus massoniana, 23) root bark of Picea abies, 24) bark of Illicium difengpi, 25) and root bark of Pseudolarix kaempferi, 26) the absolute configurations at C-7 and C-8 had not been determined. The coupling constants of the methine signals at δ 5.54 (H-7) and δ 3.34 (H-8) were 5.81 Hz, indicating a 7,8-trans configuration.…”

A New Neolignan Glycoside from the Leaves of Acer truncatum

“…During our ongoing investigations into the chemical constituents of this plant, the new neolignan glycoside (7R,8R)-7,8-dihydro-9′-hydroxyl-3′-methoxyl-8-hydroxymethyl-7-(4-hydroxy-3-methoxyphenyl)-1′-benzofuranpropanol 9′-O-β-Dglucopyranoside (1) and eight known compounds: (7R,8R)-7,8-dihydro-9′-hydroxyl-3′-methoxyl-8-hydroxymethyl-7-(4-O-α-L-rhamnopyranosyloxy-3-methoxyphenyl)-1′-benzofuranpropanol (2), schizandriside (3), lyoniresinol (4), berchemol (5), (-)-pinoresinol-4-O-β-D-glucopyranoside (6), hecogenin (7), chlorogenic acid (8) and neochlorogenic acid (9) were isolated from a water extract of A. truncatum leaves. The identification of the known compounds was supported by comparison with published data of related compounds [5][6][7][8][9][10][11][12]. Compounds 1-7 were evaluated for their antibacterial activities against Escherichia coli, Staphylococcus aureus, Micrococcus luteus and Bacillus cereus.…”