Regioselective Pyranylation of (S)-1,2-Propanediol

Abstract
In light of our recent effort in setting up a suitable pathway for the preparation of optically active oligoetherglycols (I), HO-[CH2-∗CHi(R)-O]n-H, characterized by a well definited chemical and stereochemical structure, several routes, based on conventional protecting-deprotecting procedures were tested.