1-Bromo-4-fluorobutane → 16-Fluorohexadecanol

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A general procedure for the preparation of terminal fluorinated alkoxyalkyl esters of acyclic nucleoside phosphonates is illustrated in Scheme 7, below. Fluoroalkoxyalkyl esters of acyclic nucleoside phosphonates such as 3-(16-fluorohexadecyloxy)propyl cidofovir (16-F-HDP-CDV) 49 and 3-(16-fluorohexadecyloxy)propyl (S)-HPMPA 50 (16-F-HDP-(S)-HPMPA) can be prepared using this process. Briefly, with reference to Scheme 7, the Grignard reagent prepared from 1-bromo-4-fluorobutane and magnesium is reacted with 12-bromododecanol 44 to obtain 16-fluorohexadecanol 45. Reaction of 45 with methanesulfonyl chloride followed by reaction with 1,3-propanediol provides 16-fluorohexadecyloxy-1-propanol 46. Coupling of 46 with cyclic cidofovir or cyclic (S)-HPMPA as described generally in Example 2 (step a), provides the cyclic esters (47 and 48, respectively) which can then be converted to the desired compounds (49 and 50, respectively) using the general method set forth in Example 2 (step b).

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