Chemical compounds isolated from Talinum triangulare (Portulacaceae)

This first phytochemical study of Talinum triangulare Leach (Portulacaceae), also known as ‘cariru’, which is a commonly consumed food in Northern Brazil, allowed the isolation and structural determination of four new compounds: one acrylamide, 3-N-(acryloyl, N-pentadecanoyl) propanoic acid (5), and three new phaeophytins named (151S, 17R, 18R)-Ficuschlorin D acid (31,32-didehydro-7-oxo-173-O-phytyl-rhodochlorin-15-acetic acid), (13), Talichorin A (17R, 18R)-phaeophytin b-151-hidroxy, 152,153-acetyl-131-carboxilic acid (14), and (151S, 17R, 18R)-phaeophytin b peroxylactone or (151S, 17R, 18R)-hydroperoxy-ficuschlorin D (16), together with twelve known compounds, including four phaeophytins (11,12, 15 and 17). The structures of the compounds were established on the basis of 1D and 2D NMR, IR, HRESI-MS spectra, including GC–MS, and HPLC–UV analysis, as well as comparisons with the literature data. The CD spectra data analysis were used to define the absolute configuration of phaeophytins 12 (132R, 17R, 18R)-132-hydroxyphaeophytin a, 13 and 16, 15 (151S, 17R, 18R)-31,32-didehydro-151-hydroxyrhodochlorin-15-acetic acid δ-lactone-152-methyl-173-phytyl ester and 17 (17R, 18R)-purpurin 18-phytyl ester.