申请人:EPOCH Pharmaceuticals, Inc.
公开号:US05824796A1
公开(公告)日:1998-10-20
This invention is directed to novel substituted nucleotide bases with a crosslinking arm which accomplish crosslinking between specific sites on adjoining strands of oligonucleotides or oligodeoxynucleotides. The invention is also directed to oligonucleotides comprising at least one of these crosslinking agents and to the use of the resulting novel oligonucleotides for diagnostic and therapeutic purposes. The crosslinking agents of the invention are of the following formula (I'): R.sub.1 --B--(CH.sub.2).sub.q --(Y).sub.r --(CH.sub.2).sub.m --A'(I') wherein, R.sub.1 is hydrogen, or a sugar moiety or analog thereof optionally substituted at its 3' or its 5' position with a phosphorus derivative attached to the sugar moiety by an oxygen and including groups Q.sub.1 Q.sub.2 and Q.sub.3 or with a reactive precursor thereof suitable for nucleotide bond formation; Q.sub.1 is hydroxy, phosphate or diphosphate; Q.sub.2 is .dbd.O or .dbd.S; Q.sub.3 is CH.sub.2 --R', S--R', O--R', or N--R'R"; each of R' and R" is independently hydrogen or C.sub.1-6 alkyl; B is a nucleic acid base or analog thereof that is a component of an oligonucleotide; Y is a functional linking group; each of m and q is independently 0 to 8, inclusive; r is 0 or 1; and A' is a leaving group. This invention is also directed to novel 3,4-disubstituted and 3,4,-trisubstituted pyrazolo\x9b3,4-d!-pyrimidines and to the use of these nucleic acid bases in the preparation of oligonucleotides. The invention includes nucleosides and mono- and oligonucleotides comprising at least one of these pyrazolopyrimidines, and to the use of the resulting novel oligonucleotides for diagnostic purposes.
这项发明涉及一种新型的取代核苷酸碱基,具有交联臂,能够在寡核苷酸或寡脱氧核苷酸的相邻链上的特定位点之间实现交联。该发明还涉及包含至少一种这些交联剂的寡核苷酸,以及利用由此产生的新型寡核苷酸进行诊断和治疗的用途。该发明的交联剂具有以下式(I'):R₁--B--(CH₂)q--(Y)r--(CH₂)m--A'(I'),其中,R₁是氢,或者是糖基或其类似物,在其3'或5'位置可选择性地取代为通过氧原子连接到糖基的磷衍生物,包括基团Q₁、Q₂和Q₃,或者其适用于核苷酸键形成的反应前体;Q₁是羟基、磷酸酯或二磷酸酯;Q₂是.dbd.O或.dbd.S;Q₃是CH₂--R'、S--R'、O--R'或N--R'R",其中R'和R"各自独立地是氢或C₁-₆烷基;B是核酸碱基或其类似物,是寡核苷酸的组成部分;Y是功能性连接基团;m和q各自独立地为0至8(包括8);r为0或1;A'是一个脱离基团。该发明还涉及新型的3,4-二取代和3,4-三取代吡唑嘧啶,以及在制备寡核苷酸中使用这些核酸碱基。该发明包括含有至少一种这些吡唑嘧啶的核苷和单核苷酸、寡核苷酸,以及利用由此产生的新型寡核苷酸进行诊断的用途。