Synthesis and structural revision of naturally occurring ayapin derivatives

Ethyl Cinnamate Derivatives as Promising High-Efficient Acaricides against <i>Psoroptes cuniculi</i>: Synthesis, Bioactivity and Structure–Activity Relationship

“…45) Aromatic aldehyde 1 was obtained from sesamol by the reaction of Vilsmeier-Haack formylation in 11% yield. 46) 1,3-Benzodioxole reacted with paraformaldehyde in a concentrated HCl solution to provide 2, 47) and followed by treatment with bromine in glacial acetic acid to yield 4 in 92% yield. 48) Compounds 2 and 4 were oxidized by dimethylsulphoxide oxidation in the presence of NaHCO 3 to yield intermediates 3 and 5, respectively.…”

Antitermite Activities of Coumarin Derivatives and Scopoletin from Protium javanicum Burm. f.

“…199.5°C; 1 H-NMR δ (CDCl 3 ): 6.07 (2H, s), 6.28 (1H, d, J=9. The structure of compounds (2-6) were elucidated and confirmed by 1 H and 13 C-NMR, MS, and by subsequent comparisons with reference data from the available literature (Duddeck and Kaiser 1982;Tsukamoto et al 1984;Afek et al 1986;Debenedetti et al 1998;Maes et al 2005).…”

Studies on the Chemical Constituents of Sarcandra glabra

“…In our previous chemical investigations of this plant, sesquiterpene lactones and flavonoids have been identified as constituents of the plant [4]. In the course of our continuing search for this plant, nine compounds were isolated and identified as isofraxidin(1), 8-methoxy-6,7-methylenedioxy-coumarin(2), 7-methylnaringenin(3), kaemferol(4), kaemferol-3-O-rhamno-pyranosyl (1→6) glucopyranoside (5), eleutheroside B 1 (6), isofraxidin-7-Oβ -D-xylopyranosyl(1-3)α -D-glucopyranoside (7), rosmarinic acid (8), 3，4-dihydroxyphenethyl caffeate (9). Here we report the isolation and structure elucidation of these compounds.…”