申请人:——
公开号:US20020086998A1
公开(公告)日:2002-07-04
The present invention relates to a new method for the synthesis of purine LNA (Locked Nucleic Acid) analogues which provides a higher overall yield. The method comprising a regioselective 9-N purine glycosylation reaction followed by a one-pot nucleophilic aromatic substitution reaction of the 6-substituent in the purine ring and simultaneous nucleophile-induced intramolecular ring closure of the C-branched carbohydrate to form novel purine LNA analogues. The novel strategy is illustrated by the synthesis of the novel compound (1S,3R,4R,7S)-7-benzyloxy-1-methanesulfonylmethyl-3-(guanin-9-yl)-2,5-dioxabicyclo[2.2.1]heptane which is easily converted into (1S,3R,4R,7S)-7-hydroxy-1-hydroxymethyl-3-((2-N-isobutyrylguanin-9-yl)-2,5-dioxabicyclo[2.2.1]heptane after isobutyryl protection of the 2-amino purine group and subsequent substitution of 1-methanesulfonyl with benzoate, debenzoylation and debenzylation.
本发明涉及一种用于合成嘌呤LNA(Locked Nucleic Acid)类似物的新方法,该方法提供了更高的总产率。该方法包括选择性区域9-N嘌呤糖基化反应,然后是在嘌呤环中的6-取代基上进行一锅核亲电芳香取代反应,同时核亲电引发的C-支链碳水化合物的分子内环闭合,形成新的嘌呤LNA类似物。新策略通过合成新化合物(1S,3R,4R,7S)-7-苄氧基-1-甲磺酰甲基-3-(鸟嘌呤-9-基)-2,5-二氧杂二环[2.2.1]庚烷来加以说明,该化合物易于转化为(1S,3R,4R,7S)-7-羟基-1-羟甲基-3-((2-N-异丁酰鸟嘌呤-9-基)-2,5-二氧杂二环[2.2.1]庚烷,经过对2-氨基嘌呤基的异丁酰保护和随后的1-甲磺酰与苯甲酸苄酯取代、去苯甲酰和去苄基化反应。