Novel cADPR mimics, which integrate nucleobase, northern and southern ribose modifications were synthesized. The key steps of the synthesis were a Cu(I)-catalyzed Hüisgen [3+2] cycloaddition and a microwave-assisted intramolecular pyrophosphorylation. Preliminary biological investigations showed that these cADPR mimics are membrane-permeating agonists of the calcium signaling pathway. The introduction of chlorine or fluorine at the 2'-position of the southern riboses led to a decrease of activity. The existence of a hydrophobic group on the 3'-OH of the southern riboses does not obviously alter the agonistic activity.
我们合成了新型的 c
ADPR 模拟物,它整合了核碱基、北
核糖和南
核糖修饰。合成的关键步骤是 Cu(I)催化的 Hüisgen [3+2] 环加成和微波辅助的分子内
焦磷酸化。初步的
生物学研究表明,这些 c
ADPR 模拟物是
钙信号通路的膜渗透激动剂。在南部
核糖的 2'- 位上引入
氯或
氟会导致活性降低。南方
核糖 3'-OH 上疏
水基团的存在并不会明显改变其激动活性。