Chemical markers in Veronica sect. Hebe. III

Abstract

In a continued chemosystematic investigation of the water-soluble compounds in Veronica sect. Hebe, we have investigated two more of the species formerly classified as Parahebe. Both species contained mannitol in considerable amounts and in addition some glucosides of iridoid acids. Veronica cheesemanii was characterised by aucubin and its esters: 2′-O-benzoylaucubin and an aucubin diester named cheesemanioside. The main iridoid compounds in Veronica hookeriana were catalpol and its ester verminoside, but this species also contained the sugar ester methyl 1-O-benzoyl-3-α-glucuronosylglycerol and a caffeoyl phenylethanoid glycoside (CPG) named parahebeoside, a 2′-O-β-xylopyranosyl derivative of the known plantamajoside. The results show that the studied species of the former genus Parahebe are very different with regard to their chemical content. This is in agreement with the DNA sequence data and implies the genus was polyphyletic as previously circumscribed. © 2009 Elsevier Ltd. All rights reserved

Bioactive glycosides from the African medicinal plantBoerhavia erectaL.

“…The HRESI MS analysis of 4 indicated a peak at m/z 409.1107 ([M+Na] + ), assigned to the molecular formula of C 17 H 22 O 10 Na. The NMR spectral analysis suggested a molecular structure which was similar to a reported glycerol α-D-glucuronide carboxylic acid (Cai et al, 2011) and its ester 9 (Maggi et. al, 2009 C-NMR spectral analysis indicated a singlet peak at δ 3.46 and δ 60.8 ppm,…”

A glycerol α-d-glucuronide and a megastigmane glycoside from the leaves of Guettarda speciosa L.

“…The 1 H-and 13 C-NMR spectral data (Table 1) suggested that 1 was a similar compound to that (9) isolated from Veronica species [13] (Fig. 1).…”

“…The residue was dissolved in 0.1 ml of dry pyridine and 0.5 mg of L-cysteine methyl ester was then added. To this mixture, 1.4 mg of o-tolylthioisocyanate in 70 ll of pyridine was added, followed by standing at 60°C for 1 h. The reaction mixture was analyzed by HPLC [ODS: Cosmosil 5C18ARII (4.6 mm 9 250 mm), CH 3 CN-50 mM H 3 PO 4 (1:3), 0.8 ml/min, UV detector at 250 nm] to give a peak for a thiocarbamoylthiazolidine derivative of D-glucuronic acid at 18.1 min [13]. The peak was identified by co-chromatography with that of authentic D-glucuronic acid (cf.…”

Iridoid glucosides in the genus Veronica (Plantaginaceae) from New Zealand

“…Labiatoides (Jensen et al, 2008). This was followed by material collected in the wild in New Zealand (Maggi et al, 2009;Taskova et al, 2010;2013). We have now investigated Veronica hookeri (Buchanan)…”