of non-toxic PABA resulted in constitution of antibacterialactivity including inhibition of methicillin-resistant Staphylococcus aureus (minimum inhibitory concentrations, MIC, from 15.62 µM), moderate antimycobacterial activity (MIC ≥ 62.5 µM) and potent broad-spectrum antifungal properties (MIC of ≥ 7.81 µM). Some of the Schiffbases also exhibited notable cytotoxicity for cancer HepG2 cell line
Gold-Catalyzed Tandem Intramolecular Heterocyclization/Petasis-Ferrier Rearrangement of 2-(Prop-2-ynyloxy)benzaldehydes as an Expedient Route to Benzo[b]oxepin-3(2 H)-ones
作者:Ella Min Ling Sze、Weidong Rao、Ming Joo Koh、Philip Wai Hong Chan
DOI:10.1002/chem.201003096
日期:2011.2.1
The golden ring: A synthetic approach to benzo[b]oxepin‐3(2H)‐ones by heterocyclization/Petasis–Ferrierrearrangement of 2‐(prop‐2‐ynyloxy)benzaldehydes is reported. Uniquely, the ring formation was found to only proceed efficiently in the presence of a gold catalyst. Substitution at the position ortho to the ethereal group on the salicylaldehyde ring was shown to dramatically enhance reactivity (see
金环:通过2-(prop-2-ynyloxy)苯甲醛的杂环化/ Petasis-Ferrier重排,合成了苯并[ b ] oxepin-3(2 H)-ones的合成方法。独特地,发现仅在金催化剂存在下成环有效地进行。显示在水杨醛环上的醚基的邻位取代可显着增强反应性(见图)。
Copper-Catalyzed Asymmetric Oxidation of Sulfides
作者:Graham E. O’Mahony、Alan Ford、Anita R. Maguire
DOI:10.1021/jo2026178
日期:2012.4.6
Copper-catalyzed asymmetric sulfoxidation of aryl benzyl and aryl alkyl sulfides, using aqueous hydrogen peroxide as the oxidant, has been investigated. A relationship between the steric effects of the sulfide substituents and the enantioselectivity of the oxidation has been observed, with up to 93% ee for 2-naphthylmethyl phenyl sulfoxide, in modest yield in this instance (up to 30%). The influence
Investigation of steric and electronic effects in the copper-catalysed asymmetric oxidation of sulfides
作者:Graham E. O'Mahony、Kevin S. Eccles、Robin E. Morrison、Alan Ford、Simon E. Lawrence、Anita R. Maguire
DOI:10.1016/j.tet.2013.08.063
日期:2013.11
in the copper-catalysed asymmetricoxidation of aryl benzyl, aryl alkyl and alkyl benzyl sulfides have been investigated. The presence of an aryl group directly attached to the sulfur is essential to afford sulfoxides with high enantioselectivities, with up to 97% ee for 2-naphthyl benzyl sulfoxide, the highest enantioselectivity achieved to date for copper-catalysed asymmetric sulfoxidation. In contrast
human pathogenic bacteria and fungi has become a global health problem. Based on previous reports of 4-(salicylideneamino)benzoic acids, we designed, synthesised and evaluated their me-too analogues as potential antimicrobial agents. Forty imines derived from substituted salicylaldehydes and aminobenzoic acids, 4-aminobenzoic acid esters and 4-amino-N-phenylbenzamide were designed using molecular hybridization