1655-55-6Relevant articles and documents
Synthesis of substituted N-(2′-nitrophenyl)pyrrolidine-2-carboxamides towards the design of proline-rich antimicrobial peptide mimics to eliminate bacterial resistance to antibiotics
Odusami, Jocelyn A.,Ikhile, Monisola I.,Izunobi, Josephat U.,Olasupo, Idris A.,Osunsanmi, Foluso O.,Opoku, Andrew R.,Fotsing, Marthe C.D.,Asekun, Olayinka T.,Familoni, Oluwole B.,Ndinteh, Derek T.
, (2020/10/23)
The treatment of diseases is under threat due to the increasing resistance of disease-causing bacteria to antibiotics. Likewise, free radical-induced oxidative stress has been implicated in several human disease conditions, such as cancer, stroke and diabetes. In the search for amino acid analogues with antibacterial and antioxidant properties as possible mimics of antimicrobial peptides, substituted N-(2′-nitrophenyl)pyrrolidine-2-carboxamides 4a–4k and N-(2′-nitrophenyl)piperidine-2-carboxamides 4l–4n have been synthesized via a two-step, one-pot amidation of the corresponding acids, using thionyl chloride with different amines in dichloromethane. The carboxamides were characterized by infrared and nuclear magnetic resonance spectroscopy, mass spectrometry and elemental analysis. Carboxamides 4a–4n were assayed against five Gram-positive and five Gram-negative bacterial strains using the broth micro-dilution procedure and compared to standard antibiotic drugs (streptomycin and nalidixic acid). 4b showed the highest antibacterial activity with a minimum inhibitory concentration (MIC) value of 15.6 μg/mL against Staphylococcus aureus. Pertinently, 4b and 4k are promising candidates for narrow-spectrum (Gram-positive) and broad-spectrum antibiotics, respectively. The antioxidant properties of the carboxamides were also evaluated using the 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radical cation. 4a and 4k recorded the lowest IC50 values of 1.22 × 10–3 mg/mL (with DPPH) and 1.45 × 10–4 mg/mL (with ABTS), respectively. Notably, 4k recorded about 2.5 times better antioxidant capacity than the positive controls – ascorbic acid and butylated hydroxyanisole. These results bode well for N-aryl carboxamides as good mimics and substitutes for antimicrobial peptides towards mitigating bacterial resistance to antibiotics as well as ameliorating oxidative stress-related diseases.
Iron- or Zinc-Mediated Synthetic Approach to Enantiopure Dihydroquinoxalinones
Li, Dazhi,Ollevier, Thierry
supporting information, p. 1273 - 1280 (2019/01/04)
A general and efficient synthesis of enantiopure dihydroquinoxalinones has been developed using naturally occurring amino acids as starting materials. The reductive cyclization of N-(o-nitroaryl)amino esters was performed by using iron and zinc metal under mild conditions in a water/ethyl acetate mixture. The corresponding dihydroquinoxalinones were obtained in moderate to high yields and high enantiomeric purity, among which 7 new compounds were unprecedented in the literature.
A novel method for the synthesis of chiral epoxides from styrene derivatives using chiral acids in presence of Pseudomonas lipase G6 [PSL G6] and hydrogen peroxide
Sarma, Kuladip,Bhati, Nishi,Borthakur, Naleen,Goswami, Amrit
, p. 8735 - 8741 (2008/02/09)
Chiral epoxidation of styrene and its derivatives was carried out using series of chiral acids and urea hydrogen peroxide (UHP) or aqueous hydrogen peroxide (50%) in two phases under the catalytic influence of immobilized Pseudomonas lipase G6 [PSL G6] at 25-55 °C. A moderate to good yield and enantioselectivities of chiral epoxides were obtained.
