Synthesis and antitumor activity of quaternary ellipticine glycosides, a series of novel and highly active antitumor agents
摘要:
A series of ellipticine glycosides [2-N-glycosyl quaternary pyridinium salts of three ellipticines: ellipticine (1), 9-methoxyellipticine (2), and 9-hydroxyellipticine (4)] were stereoselectively synthesized in good yields by an improved condensation reaction between ellipticines [1, 2, and 9-acetoxyellipticine (3)] and protected (peracylated and perbenzylated) glycosyl halides with cadmium carbonate, followed by deprotection. These glycosides were preliminarily evaluated for their antitumor activity in the L1210 leukemia system. Twenty-six (53%) of the 49 glycosides tested were curative, and five [9-hydroxyellipticine L-arabinopyranoside (41b), D-lyxofuranoside (43a), L-lyxopyranoside (44b), D-xylofuranoside (49a), and L-rhamnopyranoside (56)] were selected for extended evaluation on the basis of their high levels of activity. The structure-activity relationships are discussed. The selected glycosides showed remarkable activity in six different murine tumor systems with excellent therapeutic ratios; their efficacy surpassed that of doxorubicin against three of these systems. On the basis of these results and ease of formulation, the two glycosides 41b (SUN4599) and 49a (SUN5073) were selected for further preclinical evaluation and possible clinical development.
Nucleoside derivatives as inhibitors of RNA-dependent RNA viral polymerase
申请人:——
公开号:US20020147160A1
公开(公告)日:2002-10-10
The present invention provides nucleoside compounds and certain derivatives thereof which are inhibitors of RNA-dependent RNA viral polymerase. These compounds are inhibitors of RNA-dependent RNA viral replication and are useful for the treatment of RNA-dependent RNA viral infection. They are particularly useful as inhibitors of hepatitis C virus (HCV) NS5B polymerase, as inhibitors of HCV replication, and/or for the treatment of hepatitis C infection. The invention also describes pharmaceutical compositions containing such nucleoside compounds alone or in combination with other agents active against RNA-dependent RNA viral infection, in particular HCV infection. Also disclosed are methods of inhibiting RNA-dependent RNA polymerase, inhibiting RNA-dependent RNA viral replication, and/or treating RNA-dependent RNA viral infection with the nucleoside compounds of the present invention.
Disclosed are oligonucleotides and oligonucleosides that include one or more modified nucleoside units. The oligonucleotides and oligonucleosides are particularly useful as antisense agents, ribozymes, aptamer, siRNA agents, probes and primers or, when hybridized to an RNA, as a substrate for RNA cleaving enzymes including RNase H and dsRNase.
[EN] OLIGONUCLEOTIDES HAVING MODIFIED NUCLEOSIDE UNITS<br/>[FR] OLIGONUCLEOTIDES A UNITES NUCLEOSIDIQUES MODIFIEES
申请人:ISIS PHARMACEUTICALS INC
公开号:WO2003099840A1
公开(公告)日:2003-12-04
Disclosed are oligonucleotides and oligonucleosides that include one or more modified nucleoside units. The oligonucleotides and oligonucleosides are particularly useful as antisense agents, ribozymes, aptamer, siRNA agents, probes and primers or, when hybridized to an RNA, as a substrate for RNA cleaving enzymes including RNase H and dsRNase.
ara-7-Desazaxanthosin — ein Xanthin-Nucleosid mit stabiler N-glycosylischer Bindung
作者:Frank Seela、Ulrich Liman
DOI:10.1002/jlac.198419840210
日期:1984.2.13
ara-7-Desazaxanthosin (2) wurde durch Phasentransferglycosylierung von 2,4-Dimethoxy-7H-pyrrolo[2,3-d]pyrimidin (5b) mit der Halogenose 6 dargestellt. Von dem bei der Glycosylierung bevorzugt gebildeten β-Anomer 8 wurden die Benzylschutzgruppen mit Bortrichlorid entfernt und die 2,4-Dimethoxyreste mit Säure abgespalten. Das 7-Desazapurin-Nucleosid 2 besitzt im Gegensatz zu Xanthosin (1a) eine bei saurer
ARA -7- deazaxanthosine(2)的制备是通过相转移糖基化的2,4-二甲氧基- 7 ħ吡咯并[2,3- d ]嘧啶(图5b与halogenose)6。用三氯化硼除去优选在糖基化反应中形成的β-端基异构体8的苄基保护基,并用酸分离出2,4-二甲氧基。与黄嘌呤(1a)相反,7-脱氮嘌呤核苷2具有在酸水解时稳定的N-糖基键。通过比较嘌呤核苷与2的动力学参数描述了质子催化水解的反应机理,也解释了吡咯并[2,3- d ]嘧啶核苷2的稳定性。
NUCLEOSIDE DERIVATIVES AS INHIBITORS OF RNA-DEPENDENT RNA VIRAL POLYERMASE
申请人:MERCK SHARP & DOHME CORP.
公开号:US20170183373A1
公开(公告)日:2017-06-29
The present invention provides nucleoside compounds and certain derivatives thereof which are inhibitors of RNA-dependent RNA viral polymerase. These compounds are inhibitors of RNA-dependent RNA viral replication and are useful for the treatment of RNA-dependent RNA viral infection. They are particularly useful as inhibitors of hepatitis C virus (HCV) NS5B polymerase, as inhibitors of HCV replication, and/or for the treatment of hepatitis C infection. The invention also describes pharmaceutical compositions containing such nucleoside compounds alone or in combination with other agents active against RNA-dependent RNA viral infection, in particular HCV infection. Also disclosed are methods of inhibiting RNA-dependent RNA polymerase, inhibiting RNA-dependent RNA viral replication, and/or treating RNA-dependent RNA viral infection with the nucleoside compounds of the present invention.