exclusively react with the hydroxy group of nucleosides in the presence of unprotected nucleobase amino groups. Since the O-chemoselectivity of the oxazaphospholidine derivatives is likely due to their ring structure, which allows the regeneration of the oxazaphospholidine derivatives from the corresponding base phosphitylation adducts via an intramolecular recyclization, the method is expected to be compatible
描述了一种开发一种新方法来合成无碱基保护的寡脱氧
核糖核苷酸的研究。我们发现核苷 3'-O-oxazaphospholidine 衍
生物在未保护的核碱基
氨基的存在下仅与核苷的羟基反应。由于 oxazaphospholidine 衍
生物的 O-
化学选择性可能是由于它们的环结构, 这允许通过分子内再环化从相应的碱基
磷酸化加合物中再生 oxazaphospholidine 衍
生物, 因此该方法有望与任何类型的酸性活化剂兼容。