Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 65, Issue 23, Pages 7825-7832Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo000841o
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The synthesis of 12 analogues of adenine substituted at C-8 by an omega -hydroxyalkyl, omega -hydroxyalk-1-enyl, or omega -hydroxyalk-1-ynyl chain of various length has been carried out in five or six steps starting from adenine. The analogues were obtained using a new protecting group of adenine, the tert-butyldimethylsilyloxymethyl group. 9-tert-Butyldimethylsilyloxymethyl-adenine is more soluble than adenine in organic solvents. It was prepared regiospecificaly in two steps from adenine and was amenable to C-8 iodination under basic conditions and to subsequent introduction of the various carbon chains at C-8 by palladium-catalyzed cross-coupling reactions (Stille or Sonogashira). The protecting group was removed under acidic conditions, thus demonstrating its versatility.
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