4-Ethyl-2-oxo-2H-1-benzopyran-7-yl 2, 3, 4-tri-O-acetyl-5-thio-β-d-xylopyranoside, a synthetic intermediate of the orally active antithrombotic compound Iliparcil, has been prepared in 44–47% isolated yield. Different conditions were used for the glycosylation of 4- ethyl-2H-7-hydroxy-1-benzopyran-2-one 6 applying 2, 3, 4-tri-O-acetyl-5-thio-d- xylopyranosyl bromide (2), the analogous β-chloride 3 or the α-trichloroacetimidate 5 as ...
