Studies on the Regioselective Reductive Ringcleavage Reactions of 3,5-O-Arylidene-d-xylofuranosides
摘要:
Reductive ring cleavage of 3,5-O-arylidene-D-xylofuranosides using LiAlH4-AlCl3 and NaBH3CN-BF3 proceeded regioselectively to provide secondary alcohol as the major product. The effect of the substitutents on the selectivity is examined.
The hydrogenolysis of methyl 3,5-0-benzylidene-α- and -β-D-xylofuranoside derivatives with the LiAlH4-AlCl3 reagent gave 5-benzyl ethers as main products. In some cases the attack of the reagent occured at the ring oxygen of the furenoside skeleton to yield 5-0-benzyl-1-0-methylxylitol derivatives. The structure of the synthesized compounds was proved by 13C-NMR spectroscopy. Unambiguous assignment