Flavonóide e triterpenos de Stigmaphyllom paralias

Abstract

Stigmaphyllom paralias is a herb belonging to the family Malpighiaceae that occurs in sand soil of brazilian "restinga". This is the first report regarding phytochemical study with this species. The hexane extract of the aerial parts of plant afforded the triterpenes friedelin, lupenone, 3-oxo-α-amirin and 3-oxoβ-amirin, the mixture of α-amirinyl palmitate and stearate, lupeol and 3,4-seco-friedelan-3-oic acid. The AcOEt extract yielded the flavonoid luteolin-7-rutinoside. All compounds were characterized by analysis of spectrometric data and the fatty acids esterified with a-amirine were identified by GC/MS of methyl derivatives of transesterified products. This is the first natural occurence of 3,4-jeco-friedelan-3-oic acid and the 13C NMR spectral data were inequivocally assigned by two-dimensional techniques. This work also permitted to correct the 13C NMR resonances attributed to methyl groups C-26 and C-27 of fridelin.