据报道,一系列新的DNA结合分子NCD–C n –SH(n = 3、4、5和6),具有NCD(萘啶氨基甲酸酯氨基甲酸酯二聚体)结构域,选择性结合5'中的G–G错配-CGG-3'/ 5'-CGG-3'序列和一个巯基部分,在好氧条件下被氧化后会自发二聚为(NCD–C n –S)2。S–S二聚体(NCD–C n –S)2产生了1:1的结合复合物,具有改善的热稳定性。与CGG / CGG DNA结合的二聚体显示出比单体和先前合成的NCTn衍生物的结合更高的正协同性。二聚体NCD–C n –SH在CGG重复DNA上被选择性地加速,而在CAG重复DNA上没有被选择性地加速。
据报道,一系列新的DNA结合分子NCD–C n –SH(n = 3、4、5和6),具有NCD(萘啶氨基甲酸酯氨基甲酸酯二聚体)结构域,选择性结合5'中的G–G错配-CGG-3'/ 5'-CGG-3'序列和一个巯基部分,在好氧条件下被氧化后会自发二聚为(NCD–C n –S)2。S–S二聚体(NCD–C n –S)2产生了1:1的结合复合物,具有改善的热稳定性。与CGG / CGG DNA结合的二聚体显示出比单体和先前合成的NCTn衍生物的结合更高的正协同性。二聚体NCD–C n –SH在CGG重复DNA上被选择性地加速,而在CAG重复DNA上没有被选择性地加速。
ALPHA-HELIX MIMETIC WITH FUNCTIONALIZED PYRIDAZINE
申请人:Rebek, JR. Julius
公开号:US20100022549A1
公开(公告)日:2010-01-28
The synthesis of new α-helix scaffolds mimicking i, i+3 or i+4, i+7 residues, was accomplished. The common pyridazine heterocycle originates from the easily available dimethyl pyridazine-3,6-dicarboxylate building block. These scaffolds may be thought of as synthetic counterparts of amphiphilic α-helices having a hydrophilic face along one side and a hydrophobic face along the other side of the helix.
We report the visible light photocatalytic cleavage of trityl thioethers or ethers under pH-neutral conditions. The method results in the formation of the respective symmetrical disulfides and alcohols in moderate to excellent yield. The protocol only requires the addition of a suitable photocatalyst and light rendering it orthogonal to several functionalities, including acid labile protective groups
Peptide ligation assisted by an auxiliary attached to amidyl nitrogen
作者:Juan Li、Hong-Kui Cui、Lei Liu
DOI:10.1016/j.tetlet.2010.01.108
日期:2010.3
New thiol-containing auxiliaries were developed for peptide ligation. They were placed at the amidyl N-atom in the second amino acid residue of a peptide fragment. With the new auxiliaries, peptide ligation could be conducted at non-Cys and non-Gly sites. Compared to other recently developed auxiliaries, an important feature of the present design was that the new auxiliaries were generally applicable and readily removable. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of pyridazines functionalized with amino acid side chains
A simple route for the preparation of 3,4,6-substituted pyridazines is described by using Tebbe olefination of esters then Diels-Alder reaction of the resulting enol ethers with tetrazine. (C) 2007 Elsevier Ltd. All rights reserved.
Synthesis of Naphthyridine Carbamate Dimer (NCD) Derivatives Modified with Alkanethiol and Binding Properties of G–G Mismatch DNA
A series of new DNA binding molecules NCD–Cn–SH (n = 3, 4, 5, and 6) is reported, which possesses the NCD (naphthyridine carbamate dimer) domain selectively binding to the G–G mismatch in the 5′-CGG-3′/5′-CGG-3′ sequence and a thiol moiety, which undergoes spontaneous dimerization to (NCD–Cn–S)2 upon oxidation under aerobic conditions. The S–S dimer (NCD–Cn–S)2 produced the 1:1 binding complex with
据报道,一系列新的DNA结合分子NCD–C n –SH(n = 3、4、5和6),具有NCD(萘啶氨基甲酸酯氨基甲酸酯二聚体)结构域,选择性结合5'中的G–G错配-CGG-3'/ 5'-CGG-3'序列和一个巯基部分,在好氧条件下被氧化后会自发二聚为(NCD–C n –S)2。S–S二聚体(NCD–C n –S)2产生了1:1的结合复合物,具有改善的热稳定性。与CGG / CGG DNA结合的二聚体显示出比单体和先前合成的NCTn衍生物的结合更高的正协同性。二聚体NCD–C n –SH在CGG重复DNA上被选择性地加速,而在CAG重复DNA上没有被选择性地加速。