| 摘要 |
PCT No. PCT/DK90/00308 Sec. 371 Date Feb. 26, 1992 Sec. 102(e) Date Feb. 26, 1992 PCT Filed Nov. 28, 1990 PCT Pub. No. WO92/07263 PCT Pub. Date Apr. 30, 1992.The present invention relates to hitherto unknown intermediate of formula, in which R1 stands for hydrogen or a straight or branched aliphatic C1-C20 carbon chain or an aryl or aralkyl group, aryl and "ar" meaning an aromatic or heterocyclic, 5- or 6-membered ring substituent containing 1 or 2 hetero atoms selected among O, S and N, R1 optionally being further substituted, and its chain being interrupted by hetero atoms like oxygen, or by carbonyl group(s); and R3 stands for hydrogen or C1-C3 alkyl. The present intermediates can be used in a one step method for producing prodrugs of formula, where D-H =drug itself.
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