A synthesis of 3′-α-fluoro-2′,3′-dideoxyadenosine via a bromine rearrangement during fluorination with MOST reagent
作者:Satoshi Katayama、Satoshi Takamatsu、Masaki Naito、Shigehisa Tanji、Takashi Ineyama、Kunisuke Izawa
DOI:10.1016/j.jfluchem.2005.12.010
日期:2006.5
A facile method for the synthesis of 3'-alpha-fluoro-2',3'-dideoxyadenosine 6 has been developed. Fluorination of 5'-O-acetyl-3'-beta-bromo-3'-deoxyadenosine 3 with MOST gave 2'-beta-bromo-3'-alpha-fluoro-2',3'-dideoxyadenosine 4 via a rearrangement of the 3'-beta-brornine to the 2'-beta position during 3'-alpha fluorination. The 2'-beta bromine was reduced by radical reduction and then the 5'-O-acetyl group was removed to afford 3'-alpha-fluoro-2',3'-dideoxyadenosine 6 in good yield. A possible mechanism for the rearrangement is discussed. (C) 2006 Elsevier B.V. All rights reserved.