One Alkenylphenol and Steroids from the Aquatic Plant Monochoria Vaginalis

Abstract

Two new compounds have been isolated from the whole plant of Monochoria vaginalis and characterized as: (10Z)-1-(2,6-dihydroxyphenyl)octadec-10-en-1-one (1) (20R,24R)-campest-5-ene-3b,4b-diol (2) together with nine known ones. The structures of these compounds were elucidated on the basis of spectral data and chemical evidence.

Monolaterol, the First Configurationally Assigned Phenylphenalenone Derivative with a Stereogenic Center at C-9, from Monochoria elata

“…Thus, effective management strategies should be developed to control this serious weed, and phytochemical investigations could be an excellent basis for understanding ecological survival strategies of members of the genus Monochoria . Recently the isolation and structural elucidation of natural compounds from members of the Pontederiaceae revealed sterols, fatty acids, and phenylphenalenones, − but Monochoria elata has so far not been studied phytochemically and the occurrence of phenylphenalenones in the genus Monochoria has not yet been reported. Phenylphenalenones and phenylphenalenone-derived natural products like 1 − 4 have been implicated in the complex defense mechanism of plants, and their role as phytoalexins and phytoanticipins is well documented. − In this paper we report on the isolation, structural elucidation, and determination of the absolute configuration of monolaterol ( 5 ), a new phenylphenalenone-related compound from Monochoria elata Ridley (Pontederiaceae).…”