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Adenosine deaminase resistant antiviral purine nucleosides and method of preparation

  • US 4,268,672 A
  • Filed: 01/05/1979
  • Issued: 05/19/1981
  • Est. Priority Date: 02/09/1977
  • Status: Expired due to Term
First Claim
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1. A method of preparation of the purine nucleoside analog having the formula:

  • ##STR9## wherein R is selected from the group of substituent groups consisting of amino, hydroxyl, mercapto, methylmercapto and substituted amino NR'"'"'R" wherein R'"'"' and R" may be the same or different and are hydrogen, methyl, ethyl, propyl or phenyl, which method comprises;

    (A) preparing the intermediate ##STR10## wherein X is halogen, by (1) hydrolysing 2-azabicyclo[2.2.1]hept-5-en-3-one under acid conditions.(2) esterifying the carboxyl function of the resulting cis-4-aminocyclo-pent-2-ene carboxylic acid salt,(3) acetylating the amino group of the resulting ester,(4) reducing and acetylating said ester,(5) epoxidizing the resulting acetate,(6) hydrolysing and acetylating the resulting epoxide,(7) forming an amine from the resulting (±

    )-4α

    -acetamido-2β

    , 3α

    -diacetoxy-1α

    -cyclopentanemethyl acetate, and(8) condensing said amine with 5-amino-4,6-dihalopyrimidine to produce said intermediate;

    (B) closing the ring of said intermediate by reaction with a ring closing agent selected from the class consisting of diethoxymethyl acetate and triethyl orthoformate, and(C) replacing the halogen with a substituent from the group consisting of amino, hydroxyl, mercapto, methylmercapto and substituted amino.

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