The straightforward preparation and resolution of phosphorothioates an
d phosphorothioamidates from 1,1'-biphenyl-2,2'-diol 1 and 1,1'-binaph
thalene-2,2'-diol 2 are described. Basic alcoholysis of phosphorothioa
midate of 1,1'-binaphthalene-2,2'-diol 6b and 6c is highly stereoselec
tive and gives only one diastereomer.