The enzymatically derived and enantiopure cis-1,2-dihydrocatechol 1 has been converted, over 14 one-pot operations, into the (þ)-form of the alkaloid narseronine (2). The present study, which complements earlier work that established a route from metabolite 1 to enantiomer ( )-2, involves an N-bromosuccinimide/tri-n-butyltin hydride-mediated cyclisation reaction to construct the unsaturated B-r...

The description of Galanthus lebedevae from limestone canyons foothills in south-east Sochi is presented. species belongs to series Latifolii, subseries Viridifolii (Kem.-Nath.) A. P. Davis. It shows an external morphological similarity with the sympatric Colchian G. platyphyllus, krasnovii, panjutini, and woronowii, however, it differs sharply all listed content nuclear (2C) DNA, phenology, ec...

Ipheion uniflorum (Amaryllidaceae, Allioideae) es una planta geófita endémica de las Pampas en Argentina, Uruguay y sur Brasil, bulbosas ornamentales sudamericanas más cultivadas conocidas el mundo. Su distribución Argentina se registra especialmente la provincia Buenos Aires. El objetivo del presente trabajo presentar primer registro esta especie departamento General López al Santa Fe, donde o...