Synthesis of fagopyritols A1 and B1 from d-chiro-inositol

Fagopyritol A1 (3-O-α-d-galactopyranosyl-d-chiro-inositol) and fagopyritol B1 (2-O-α-d-galactopyranosyl-d-chiro-inositol) have been synthesized by glycosylation of the diequatorial diol 1,4,5,6-tetra-O-benzoyl-d-chiro-inositol, readily obtained from d-chiro-inositol, with 2,3,4,6-tetra-O-benzyl-d-galactopyranosyl trichloroacetimidate.