Amination of αβ-Unsaturated γ-Dicarbonyl Compounds with Methoxyamines
摘要:
Methoxyamines were found to be efficient aminating agents for alpha,beta-unsaturated gamma-dicarbonyl compounds to give the corresponding alpha,beta-diacyl enamines by a one-pot, two-step procedure.
Degradable Conjugates from Oxanorbornadiene Reagents
作者:Alexander A. Kislukhin、Cody J. Higginson、Vu P. Hong、M. G. Finn
DOI:10.1021/ja301491h
日期:2012.4.11
virtue of a stereochemically dependent acceleration of cycloreversion. The release rate of fluorescent cargo from serum albumins was tuned by selecting the coupling partners: the available half-lives ranged from 40 min to 7 days at 37 °C. Such versatility of release profiles from protein carriers, controlled by the nature of the OND linkage, is a useful addition to the drug delivery toolbox.
探索了氧降冰片二烯二羧酸 (OND) 试剂作为代表性大分子载体,用于从血清白蛋白中结合和释放药物。作为高度反应性的迈克尔受体,OND 与硫醇和胺形成加合物,然后进行逆狄尔斯-阿尔德断裂。对 30 多个模型加合物的研究揭示了许多可用于影响加合物稳定性的修改。对于反应性最强的 OND 接头,单个可用牛血清白蛋白 (BSA) 半胱氨酸残基的标记在几分钟内以中等微摩尔浓度的反应物完成。虽然使用模型氨基酸观察到硫醇对胺的选择性大于 1000 倍,但用 OND 标记蛋白质胺的速度足够快,可以实用,正如与硫醇耗尽的 BSA 的反应所证明的那样。发现 OND-胺加合物比 OND-硫醇加合物稳定多达 15 倍,并且由于立体化学依赖的环逆转加速而对酸敏感。通过选择偶联伙伴来调整血清白蛋白中荧光货物的释放速率:可用的半衰期在 37°C 下为 40 分钟到 7 天。由 OND 连接的性质控制的蛋白质载体释放曲线的
Fehlauer,A. et al., Chemische Berichte, 1976, vol. 109, p. 253 - 260