Cooperativity in the counterion catalysis of Morita/Baylis/Hillman reactions promoted by enantioselective trifunctional organocatalysts
作者:Christopher Anstiss、Fei Liu
DOI:10.1016/j.tet.2010.05.007
日期:2010.7
New trifunctionalorganocatalysts with a NHTs Brønsted acid were prepared and tested in their ability to promote the counterion catalysis of generic and aza-Morita/Baylis/Hillman reactions. The cooperativity between the counterion and the NHTs Brønsted acid of the trifunctional catalyst was required for good enantioselectivity and rate enhancement. Better enantioselectivity was observed for aza-MBH
Cinnamonitrile Adjuvants Restore Susceptibility to β-Lactams against Methicillin-Resistant <i>Staphylococcus aureus</i>
作者:Enrico Speri、Choon Kim、Stefania De Benedetti、Yuanyuan Qian、Elena Lastochkin、Jennifer Fishovitz、Jed F. Fisher、Shahriar Mobashery
DOI:10.1021/acsmedchemlett.9b00169
日期:2019.8.8
beta-Lactams are used routinely to treat Staphylococcus aureus infections. However, the emergence of methicillin-resistant S. aureus (MRSA) renders them clinically precarious. We describe a class of cinnamonitrile adjuvants that restore the activity of oxacillin (a penicillin member of the beta-lactams) against MRSA. The lead adjuvants were tested against six important strains of MRSA, one vancomycin-intermediate S. aureus (VISA) strain, and one linezolid-resistant S. aureus strain. Five compounds out of 84 total compounds showed broad potentiation. At 8 mu M (E)-3-(5-(3,4-dichlorobenzy1)-2-(trifluoromethoxy)phenyl)-2-(methylsulfonyl)acrylonitrile (26) potentiated oxacillin with a >4000-fold reduction of its MIC (from 256 to 0.06 mg.L-1). This class of adjuvants holds promise for reversal of the resistance phenotype of MRSA.
Structure–activity relationship of the cinnamamide family of antibiotic potentiators for methicillin-resistant <i>Staphylococcus aureus</i> (MRSA)
restored. We describe herein our discovery of one class of such agents, the cinnamamide family of antibioticpotentiators. A hit compound of the class (compound 1) showed modest potentiation of the activity of oxacillin, a penicillin antibiotic, against an MRSA strain. A total of 50 analogues of compound 1 were prepared and screened. Seven of these compounds showed more dramatic potentiation of the antibacterial
A green and practical method for the synthesis of N-arylsulfonamides from chloramine salts and arylboronic acids is herein developed. The reaction proceeds readily in the presence of 5 mol% of CuI and 2.5 equiv. K2CO3 in water at room temperature, generating a variety of N-arylsulfonamides in moderate to good yields with good functional group tolerance.
本文开发了一种从氯胺盐和芳基硼酸合成N-芳基磺酰胺的绿色实用方法。在5mol%的CuI和2.5当量的存在下,反应容易进行。室温下水中的K 2 CO 3,以中等至良好的产率生成各种N-芳基磺酰胺,并具有良好的官能团耐受性。