Synthesis of C-11 linked active ester derivatives of vitamin D3 and their conjugations to 42-residue helix–loop–helix peptides
作者:Qi Zhang、Thomas Norberg、Jonas Bergquist、Lars Baltzer
DOI:10.1016/j.tet.2010.04.051
日期:2010.6
Derivatives of vitamin D3 carrying an 8-carbon linker at C-11 terminating in an active ester were synthesized from commercial vitamin D3 using a disassembly–reassembly strategy. Vitamin D3 was cleaved at the C6–C7 double bond and the ‘upper’ fragment was converted, via a series of reactions, to derivatives substituted at C-11 with an 8-carbon linker terminating in an ethyl ester. Reassembly with modified
维生素D 3的衍生物在C-11端带有8个碳的连接基,并终止于活性酯中,是使用分解-重组策略从商业维生素D 3合成的。维生素D 3在C6-C7双键处裂解,“上部”片段通过一系列反应转化为在C-11处被8碳连接基取代的衍生物,该连接基终止于乙酯。使用Horner-Wittig烯烃化反应将修饰的“低级”片段重新组装,然后进行连接基酯水解,并用对硝基苯酚进行再酯化,得到C-11取代的对硝基苯酯。这些维生素D衍生物通过它们的p反应与42个氨基酸的螺旋-环-螺旋肽缀合肽上带有赖氨酰基侧链氨基的-硝基苯基酯。维生素D-肽结合物是维生素D-结合蛋白的潜在特异性结合物候选物,通过质谱和CD测量表征。