Use of 5-deoxy-ribo-hexofuranose derivatives for the preparation of 5'-nucleotide phosphonates and homoribonucleosides
A convenient and general method is proposed for the synthesis of 5'-nucleotide phosphonate analogs starting from 5-deoxy-1,2-O-isopropylidene-α-D-xylo-hexofuranose which can easily be produced in preparative quantities from D-glucose. Phosphonate IIIe was synthesized by means of the Arbuzov reaction between 3-O-benzoyl-6-bromo-5,6-dideoxy-1,2-O-isopropylidene-α-D-ribo-hexofuranose and triethyl phosphite. The consecutive acetolysis, condensation with uracil and N6-benzoyladenine bis-trimethylsilyl derivatives and deblocking possessed phosphonate analogs of 5'-nucleotides in good yields. The intermediate 5-deoxy-1,2-O-isopropylidene-α-D-ribo-hexofuranose derivatives were used for the preparation of homonucleosides.