Design and Enantioselective Synthesis of a Peptidomimetic of the Turn in the Helix−Turn−Helix DNA-Binding Protein Motif
作者:Jeremy M. Travins、Felicia A. Etzkorn
DOI:10.1021/jo971077h
日期:1997.11.1
A peptidomimetic of the turn in the helix-turn-helix (HTH) motif of DNA-binding proteins was designed and synthesized. Conformational constraint was achieved by an unusual linking of two amino acids with a side chain carbon-carbon bond. A phenyl ring provides the potential for new hydrophobic contacts with the hydrophobic core of the HTH motif. In the mimic, the peptide backbone and the central residue
设计并合成了DNA结合蛋白的螺旋-螺旋-螺旋(HTH)基序中的肽模拟物。通过两个氨基酸与侧链碳-碳键的不寻常连接来实现构象约束。苯环为与HTH基序的疏水核进行新的疏水性接触提供了可能。在模拟物中,肽主链和中央残基以天然形式保留在12元环状三肽中。通过两个连续的Horner-Wittig偶联合成目标化合物1b,然后通过Rh(MeDuPHOS)在八个步骤中对映选择性氢化,总收率为35%。关键氢化的立体化学结果由RuO(2)/ NaIO(4)进行芳香环氧化确定,得到2当量的Boc-Asp-OMe。