| 摘要 |
A process of prepg a cpd of general formula 1 wherein R3 is hydrogen or lower alkyl and n is an integer from 1 to 5, comprising reacting a cpd of the general formula 2 with a lower alkyl orthoester of a lower fatty acid or with formic acid in the presence of acetic anhydride. - (12pp) EPAB- EP-126813 B A process of prepg a cpd of general formula 1 wherein R3 is hydrogen or lower alkyl and n is an integer from 1 to 5, comprising reacting a cpd of the general formula 2 with a lower alkyl orthoester of a lower fatty acid or with formic acid in the presence of acetic anhydride. USAB- US4451478 A Cpds. of formula (I) are new: (n=1-5). - (I) can be used to make erythro-9-(2-hydroxy-3-nonyl) hypoxanthine (IV) and its homologues and also to make cpds. of formula (II) and (III), (where R is 1-4C alkyl, Cl or Br). All three classes of cpds. and (I) are useful as immunomodulators. (0/0)
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