Evaluation of ethyl N-(2-phenethyl) carbamate analogues as biofilm inhibitors of methicillin resistant Staphylococcus aureus
作者:Matthew D. Stephens、Nisakorn Yodsanit、Christian Melander
DOI:10.1039/c6ob00706f
日期:——
A small molecule library consisting of 45 compounds was synthesized based on the bacterial metabolite ethylN-(2-phenethyl) carbamate. From this library, a more potent, broad-spectrum inhibitor of MRSA biofilm formation was discovered.
at the ether oxygen, the least basic heteroatom, is essential to promote CO bond cleavage. However, the carbonyl oxygen of carbamates, the most basic site, is protonated exclusively in strong acids. We found that the protonation site can be shifted to an alternative basic atom by linking methyl salicylate to the ether oxygen of carbamate. The methyl ester oxygen ortho to the phenolic (ether) oxygen
我们发现,phenethylcarbamates而承受邻-salicylate作为醚基(氨基甲酰基水杨酸盐)显着加速ö C键的离解在强酸,以促进异氰酸酯生成阳离子(N-质子化的异氰酸酯),其经历随后的分子内的芳族亲电环化反应,得到dihydroisoquinolones的。为了产生从在酸性介质如亲电子芳族取代氨基甲酸酯的异氰酸酯的阳离子,质子化的醚氧,该至少基本杂原子,是必不可少的,以促进Ç O键裂解。但是,氨基甲酸酯的羰基氧(最基本的位点)仅在强酸中被质子化。我们发现,通过将水杨酸甲酯连接到氨基甲酸酯的醚氧上,质子化位点可以转移到另一个碱性原子上。水杨酸酯的酚(醚)氧邻位的甲酯氧与氨基甲酸酯羰基氧一样碱性,我们发现强酸中甲酯氧的单质子化导致分子内阳离子氢键的形成(>C Ò + H⋅⋅⋅O<)与酚醛醚氧。这有助于O苯乙基氨基甲酸酯的C键解离,从而促进异氰酸酯阳离子的形成。相反