Stereospecific fluorination of 1,3,5-tri-O-benzoyl-α-d-ribofuranose-2-sulfonate esters: preparation of a versatile intermediate for synthesis of 2′-[]-fluoro-arabinonucleosides
作者:Mian M Alauddin、Peter S Conti、Thomas Mathew、John D Fissekis、G.K Surya Prakash、Kyoichi A Watanabe
DOI:10.1016/s0022-1139(00)00307-9
日期:2000.10
A detailed investigation on fluorination of 1,3,5-tri-O-benzoyl-alpha -D-ribofuranose-2-sulphonate esters is reported. Various combinations of sulfonate esters, fluorinating agents and solvents were evaluated in this study. Organic ammonium fluoride, in particular n-Bu4NF, was found to be better fluorinating agent than inorganic fluoride, and 1,3,5-tri-O-benzoyl-alpha -D-ribofuranose-2-trifluoramethylsulphonate ester appeared to be the best substrate. The developed method is suitable for stereospecific (arabino) incorporation of radiofluorine (F-18) into the sugar moiety. (C) 2000 Elsevier Science S.A. All rights reserved.