Abstract

Cyclization of 3,4,6-tri-O-benzyl-1-deoxy-1-phenyldimethylsilyl-L-glucitol using a slight excess of BF 3Et 2O or a catalytic amount of H 2SO 4 gives access to the 2,5-anhydro-L-glucitol or 2,5-anhydro-L-mannitol derivative, respectively.

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