Isolation and structure of an unusual cyclic amino alditol from a legume

Abstract

1,5-Dideoxy-1,5-imino-D-mannitol, (1), has been isolated as an unusual constituent of Lonchocarpus sericeus and L. costaricensis; its relative conformation has been determined by ¹H and ¹³C n.m.r. spectroscopy and its absolute configuration determined by the benzoate chirality method.