Abstract

ALQASOUMI, Saleh I.; AL-REHAILY, Adnan J.  and  ABDEL-KADER, Maged Saad. Two isoflavans and a 3-arylcoumarin from the roots of Lotus lalambensis growing in Saudi Arabia. Rev. latinoam. quím [online]. 2013, vol.41, n.1, pp.61-67. ISSN 0370-5943.

Phytochemical investigation of Lotus lalambensis roots resulted in the isolation and identification of two isoflavan derivatives; vestitol (1) and lotisoflavan (3). Lot-isoflavan (3) is isolated for the first time from plants under normal conditions. In addition a 3-arylcoumarin derivative; 2',7-dihydroxy-4',5-dimethoxy-3-arylcoumarin (2) was also isolated. Structures of the compounds were elucidated utilizing UV, [α], 1D- 2D-NMR spectroscopy as well as MS. The positions of the methyl groups were unequivocally assigned based on combination of HMBC and NOESY experiments.

Keywords : Lotus lalambensis; Fabaceae; 3-arylcoumarin; isoflavans.