Chiral dihydrothiophenes derived from carbohydrates can be transformed into
a novel class of bicyclic and highly functionalized chirons by treatment w
ith NaH. A mechanistic rationale is proposed which is consistent with exper
imental observations and demonstrates the stereodiscriminating properties e
xerted by carbohydrate chains with different configurations. (C) 2001 Elsev
ier Science Ltd. All rights reserved.