Cephem Sulfones as Inactivators of Human Leukocyte Elastase. 5. 7.alpha.-Methoxy- and 7.alpha.-Chloro-1,1-dioxocephem 4-Ketones
作者:Marco Alpegiani、Pierluigi Bissolino、Riccardo Corigli、Stefano Del Nero、Ettore Perrone、Vincenzo Rizzo、Nereo Sacchi、Giuseppe Cassinelli、Giovanni Franceschi、Antonio Baici
DOI:10.1021/jm00049a020
日期:1994.11
as inhibitors of human leukocyte elastase (HLE) have been extended to the new class of cephem 4-ketones. tert-Butyl and phenyl ketones were prepared from 4-carboxycephem derivatives, at either the sulfide or sulfone oxidation level, by chemoselective Grignard reaction. Obtained products were functionalized with heterocyclothio and acyloxy substituents at C-3', C-2, or both positions. tert-Butyl ketones
作为人类白细胞弹性蛋白酶(HLE)抑制剂的头孢砜的研究已经扩展到新的头孢4-酮类。叔丁基和苯基酮是通过化学选择性的格氏反应从4-羧甲基苯丙氨酸衍生物以硫化物或砜的氧化水平制备的。将获得的产物在C-3',C-2或两个位置上用杂环硫基和酰氧基取代基官能化。通常,在抑制酶方面,7α-氯乙苯系列的叔丁基酮至少与相应的酯一样有效,但是水解稳定性的改善仅是很小的。另一方面,7α-甲氧基头孢酮系列的叔丁基酮将强大的生化活性与可接受的水解稳定性结合在一起,从而超过了先前报道的酯,硫酯和酰胺。特别是,在C-3'或C-2处具有杂环硫基的叔丁基酮的活性至少与相应的叔丁基酯同等,但在生理缓冲液(pH 7.4,37摄氏度)中则稳定了一个数量级。在C-2处引入酰氧基提供了迄今为止报道的头孢烯类最有效的HLE抑制剂,其抑制参数通常超出了我们标准方案的测定范围(二级速率常数kon> 2,000,000 M-1 s-1; Ki稳态<2